Soil Biogeochemical Response to Drought Conditions in the Biosphere 2 Rainforest

2020 ◽  
Author(s):  
Joanne Shorter ◽  
Joseph Roscioli ◽  
Laura Meredith ◽  
Juliana Gil-Loaiza
Keyword(s):  
Root Zone ◽  
Control Area ◽  
High Temporal Resolution ◽  
Site Preference ◽  
Biogeochemical Processes ◽  
Isotopic Signatures ◽  
Biosphere 2 ◽  
Mixing Ratios ◽  
The Impact ◽  
Soil Gases

<p>The direct measurement of soil gases provides insight into the biogeochemical processes responsible for micro- and macro-nutrient cycling, respiration, signaling, and environmental responses.  The concentrations and isotopic signatures of soil gases are effective messengers of the microbial pathways active in the soil.  We have developed and deployed a high frequency sensor consisting of new diffusive soil probes coupled with a Tunable Infrared Laser Direct Absorption Spectrometer (TILDAS) to monitor a range of soil gas species to investigate biogeochemical soil processes.</p><p>An array of soil probes was deployed at the Tropical Rainforest at Biosphere 2 in Arizona as part of the Water Atmosphere and Life Dynamics (WALD) experiment in 2019-2020.  Probes were located in a root zone and nearby control area, and at several depths via a soil pit.  These probes were coupled with a TILDAS to monitor isotopologues of nitrous oxide (N<sub>2</sub>O) including <sup>14</sup>N<sup>15</sup>NO, <sup>15</sup>N<sup>14</sup>NO, N<sub>2</sub><sup>18</sup>O, and methane (<sup>13</sup>CH<sub>4</sub> and <sup>12</sup>CH<sub>4</sub>), as well as CO<sub>2</sub>. During the WALD experiment, the probe-TILDAS system followed the impact on the soil biome of a 2 month induced drought in the rainforest and the subsequent return of rain.  The high temporal resolution of the system allowed us to monitor each probe every 2 hours and thus observe changes in the composition of soil gases that reflect biogeochemical processes and pathways.  CO<sub>2</sub> and thus respiration decreased significantly during the drought and was slow to recover.  Differences in N<sub>2</sub>O mixing ratios and isotopic signatures (both site preference and bulk 15N) in the root zone versus a controlled soil region were observed during both drought and rewetting periods.  Changes in nitrogen and carbon cycles and the microbial pathways during the induced drought and rewetting as reflected in these observations will be discussed.</p>

scholarly journals Effects of soil rewetting and thawing on soil gas fluxes: a review of current literature and suggestions for future research

2012 ◽  
Vol 9 (7) ◽  
pp. 2459-2483 ◽  
Author(s):  
D.-G. Kim ◽  
R. Vargas ◽  
B. Bond-Lamberty ◽  
M. R. Turetsky
Keyword(s):  
Gas Production ◽  
Global Climate Models ◽  
Soil Gas ◽  
High Temporal Resolution ◽  
Short Term ◽  
Frozen Soils ◽  
Gas Fluxes ◽  
Rapid Changes ◽  
The Impact ◽  
Soil Gases

Abstract. The rewetting of dry soils and the thawing of frozen soils are short-term, transitional phenomena in terms of hydrology and the thermodynamics of soil systems. The impact of these short-term phenomena on larger scale ecosystem fluxes is increasingly recognized, and a growing number of studies show that these events affect fluxes of soil gases such as carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), ammonia (NH3) and nitric oxide (NO). Global climate models predict that future climatic change is likely to alter the frequency and intensity of drying-rewetting events and thawing of frozen soils. These future scenarios highlight the importance of understanding how rewetting and thawing will influence dynamics of these soil gases. This study summarizes findings using a new database containing 338 studies conducted from 1956 to 2011, and highlights open research questions. The database revealed conflicting results following rewetting and thawing in various terrestrial ecosystems and among soil gases, ranging from large increases in fluxes to non-significant changes. Studies reporting lower gas fluxes before rewetting tended to find higher post-rewetting fluxes for CO2, N2O and NO; in addition, increases in N2O flux following thawing were greater in warmer climate regions. We discuss possible mechanisms and controls that regulate flux responses, and recommend that a high temporal resolution of flux measurements is critical to capture rapid changes in gas fluxes after these soil perturbations. Finally, we propose that future studies should investigate the interactions between biological (i.e., microbial community and gas production) and physical (i.e., porosity, diffusivity, dissolution) changes in soil gas fluxes, apply techniques to capture rapid changes (i.e., automated measurements), and explore synergistic experimental and modelling approaches.

scholarly journals Ontogenetic shift in the trophic role of the invasive killer shrimp Dikerogammarus villosus: a stable isotope study

2021 ◽  
Author(s):  
Francesco Mancini ◽  
Raffaele De Giorgi ◽  
Alessandro Ludovisi ◽  
Salvatrice Vizzini ◽  
Giorgio Mancinelli
Keyword(s):  
Dietary Habits ◽  
Trophic Position ◽  
Ecological Impact ◽  
Central Italy ◽  
Local Conditions ◽  
Dikerogammarus Villosus ◽  
Isotopic Signatures ◽  
Depth Analysis ◽  
Stable Isotope Study ◽  
The Impact

AbstractThe introduction of the amphipod Dikerogammarus villosus in European fresh waters is to date recognized as a threat to the integrity of invaded communities. Predation by D. villosus on native benthic invertebrates is assumed as the key determinant of its ecological impact, yet available information describe the species as a primary consumer as well as a carnivore depending on local conditions. Here, we assessed the trophic position (TP) of D. villosus in Lake Trasimeno, a recently invaded lentic system in central Italy, using the CN isotopic signatures of individuals captured in winter spanning two orders of magnitude in body size. TP estimations were compared with those characterizing the native amphipod Echinogammarus veneris and other representative invertebrate predators. On average, D. villosus showed a trophic position higher than E. veneris, and comparable with that of odonate nymphs. An in-depth analysis revealed that large-sized individuals had a trophic position of 3.07, higher than odonates and close to that of the hirudinean predator Erpobdella octoculata, while small-sized specimens had a trophic position of 2.57, similar to that of E. veneris (2.41). These findings indicate that size-related ontogenetic shifts in dietary habits may per se vary the nature of the interaction between Dikerogammarus villosus and native invertebrates from competition to predation. Information collated from published isotopic studies corroborated the generality of our results. We conclude that intra-specific trophic flexibility may potentially amplify and make more multifaceted the impact of the species on other invertebrate species in invaded food webs.

scholarly journals Assessing the regional impacts of Mexico City emissions on air quality and chemistry

2009 ◽  
Vol 9 (11) ◽  
pp. 3731-3743 ◽  
Author(s):  
M. Mena-Carrasco ◽  
G. R. Carmichael ◽  
J. E. Campbell ◽  
D. Zimmerman ◽  
Y. Tang ◽  
...  
Keyword(s):  
Air Quality ◽  
Mexico City ◽  
Ozone Production ◽  
Anthropogenic Aerosol ◽  
Near Surface ◽  
Mixing Ratios ◽  
Regional Impacts ◽  
Photolysis Rates ◽  
Regional Air Quality ◽  
The Impact

Abstract. The impact of Mexico City (MCMA) emissions is examined by studying its effects on air quality, photochemistry, and on ozone production regimes by combining model products and aircraft observations from the MILAGRO experiment during March 2006. The modeled influence of MCMA emissions to enhancements in surface level NOx, CO, and O3 concentrations (10–30% increase) are confined to distances <200 km, near surface. However, the extent of the influence is significantly larger at higher altitudes. Broader MCMA impacts (some 900 km Northeast of the city) are shown for specific outflow conditions in which enhanced ozone, NOy, and MTBE mixing ratios over the Gulf of Mexico are linked to MCMA by source tagged tracers and sensitivity runs. This study shows that the "footprint" of MCMA on average is fairly local, with exception to reactive nitrogen, which can be transported long range in the form of PAN, acting as a reservoir and source of NOx with important regional ozone formation implications. The simulated effect of MCMA emissions of anthropogenic aerosol on photochemistry showed a maximum regional decrease of 40% in J[NO2→NO+O], and resulting in the reduction of ozone production by 5–10%. Observed ozone production efficiencies are evaluated as a function of distance from MCMA, and by modeled influence from MCMA. These tend to be much lower closer to MCMA, or in those points where modeled contribution from MCMA is large. This research shows that MCMA emissions do effect on regional air quality and photochemistry, both contributing large amounts of ozone and its precursors, but with caveat that aerosol concentrations hinder formation of ozone to its potential due to its reduction in photolysis rates.

Isotopic evidence for the origin of dimethylsulfide and dimethylsulfoniopropionate-like compounds in a warm, monomictic freshwater lake

2016 ◽  
Vol 13 (2) ◽  
pp. 340 ◽  
Author(s):  
Michal Sela-Adler ◽  
Ward Said-Ahmad ◽  
Orit Sivan ◽  
Werner Eckert ◽  
Ronald P. Kiene ◽  
...  
Keyword(s):  
Sulfur Compound ◽  
Sulfur Cycle ◽  
Freshwater Lake ◽  
Aquatic Environments ◽  
Dissimilatory Sulfate Reduction ◽  
Biogeochemical Processes ◽  
Multiple Sources ◽  
Isotopic Signatures ◽  
Isotopic Evidence ◽  
Water Columns

Environmental context The volatile sulfur compound, dimethylsulfide (DMS), plays a major role in the global sulfur cycle by transferring sulfur from aquatic environments to the atmosphere. Compared to marine environments, freshwater environments are under studied with respect to DMS cycling. The goal of this study was to assess the formation pathways of DMS in a freshwater lake using natural stable isotopes of sulfur. Our results provide unique sulfur isotopic evidence for the multiple DMS sources and dynamics that are linked to the various biogeochemical processes that occur in freshwater lake water columns and sediments. Abstract The volatile methylated sulfur compound, dimethylsulfide (DMS), plays a major role in the global sulfur cycle by transferring sulfur from aquatic environments to the atmosphere. The main precursor of DMS in saline environments is dimethylsulfoniopropionate (DMSP), a common osmolyte in algae. The goal of this study was to assess the formation pathways of DMS in the water column and sediments of a monomictic freshwater lake based on seasonal profiles of the concentrations and isotopic signatures of DMS and DMSP. Profiles of DMS in the epilimnion during March and June 2014 in Lake Kinneret showed sulfur isotope (δ34S) values of +15.8±2.0 per mille (‰), which were enriched by up to 4.8 ‰ compared with DMSP δ34S values in the epilimnion at that time. During the stratified period, the δ34S values of DMS in the hypolimnion decreased to –7.0 ‰, close to the δ34S values of coexisting H2S derived from dissimilatory sulfate reduction in the reduced bottom water and sediments. This suggests that H2S was methylated by unknown microbial processes to form DMS. In the hypolimnion during the stratified period DMSP was significantly 34S enriched relative to DMS reflecting its different S source, which was mostly from sulfate assimilation. In the sediments, δ34S values of DMS were depleted by 2–4 ‰ relative to porewater (HCl-extracted) DMSP and enriched relative to H2S. This observation suggests two main formation pathways for DMS in the sediment, one from the degradation of DMSP and one from methylation of H2S. The present study provides isotopic evidence for multiple sources of DMS in stratified water bodies and complex DMSP–DMS dynamics that are linked to the various biogeochemical processes within the sulfur cycle.

scholarly journals Eta-CMAQ air quality forecasts for O<sub>3</sub> and related species using three different photochemical mechanisms (CB4, CB05, SAPRC-99): comparisons with measurements during the 2004 ICARTT study

2010 ◽  
Vol 10 (6) ◽  
pp. 3001-3025 ◽  
Author(s):  
S. Yu ◽  
R. Mathur ◽  
G. Sarwar ◽  
D. Kang ◽  
D. Tong ◽  
...  
Keyword(s):  
Air Quality ◽  
Production Efficiency ◽  
Gulf Of Maine ◽  
Ozone Production ◽  
Eastern United States ◽  
Forecast Performance ◽  
Transport And Transformation ◽  
Mixing Ratios ◽  
Upper Limits ◽  
The Impact

Abstract. A critical module of air quality models is the photochemical mechanism. In this study, the impact of the three photochemical mechanisms (CB4, CB05, SAPRC-99) on the Eta-Community Multiscale Air Quality (CMAQ) model's forecast performance for O3, and its related precursors has been assessed over the eastern United States with observations obtained by aircraft (NOAA P-3 and NASA DC-8) flights, ship and two surface networks (AIRNow and AIRMAP) during the 2004 International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) study. The results show that overall none of the mechanisms performs systematically better than the others. On the other hand, at the AIRNow surface sites, CB05 has the best performance with the normalized mean bias (NMB) of 3.9%, followed by CB4 (NMB=−5.7%) and SAPRC-99 (NMB=10.6%) for observed O3≥75 ppb, whereas CB4 has the best performance with the least overestimation for observed O3<75 ppb. On the basis of comparisons with aircraft P-3 measurements, there were consistent overestimations of O3, NOz, PAN and NOy and consistent underestimations of CO, HNO3, NO2, NO, SO2 and terpenes for all three mechanisms although the NMB values for each species and mechanisms were different. The results of aircraft DC-8 show that CB05 predicts the H2O2 mixing ratios most closely to the observations (NMB=10.8%), whereas CB4 and SAPRC-99 overestimated (NMB=74.7%) and underestimated (NMB=−25.5%) H2O2 mixing ratios significantly, respectively. For different air mass flows over the Gulf of Maine on the basis of the ship data, the three mechanisms have relatively better performance for O3, isoprene and SO2 for the clean marine or continental flows but relatively better performance for CO, NO2 and NO for southwesterly/westerly offshore flows. The results of the O3-NOz slopes over the ocean indicate that SAPRC-99 has the highest upper limits of the ozone production efficiency (εN) (5.8), followed by CB05 (4.5) and CB4 (4.0) although they are much lower than that inferred from the observation (11.8), being consistent with the fact that on average, SAPRC-99 produces the highest O3, followed by CB05 and CB4, across all O3 mixing ratio ranges

Randomized Prospective Study of the Impact of Three Needleless Intravenous Systems on Needlestick Injury Rates

1996 ◽  
Vol 17 (12) ◽  
pp. 803-808
Author(s):  
Paul B. L'Ecuyer ◽  
Elizabeth Owens Schwab ◽  
Elizabeth Iademarco ◽  
Norma Barr ◽  
Elizabeth A. Aton ◽  
...  
Keyword(s):  
Controlled Trial ◽  
Tertiary Care ◽  
Control Area ◽  
Needlestick Injury ◽  
Pathogen Transmission ◽  
Needlestick Injuries ◽  
Injury Rates ◽  
Rate Ratios ◽  
And Control ◽  
The Impact

AbstractObjective:To determine the impact of three needleless intravenous systems on needlestick injury rates.Design:Randomized controlled trial.Setting:1,000-bed tertiary-care Midwestern hospital.Participants:Nursing personnel from general medical, general surgical, and intensive-care units.Interventions:From June 1992 through March 1994, a metal blunt cannula (MBC), two-way valve (2-way), and plastic blunt cannula (PBC) were introduced into three study areas, and needlestick injury rates were compared to three control areas using traditional needled devices.Results:24 and 29 needlestick injuries were reported in study and control areas. Intravenous-therapy-related injuries comprised 45.8% and 57.1% of injuries in each area. Thirty-seven percent and 20.7% of study and control area needlestick injuries were considered to pose a high risk of bloodborne infection. The 2-way group had similar rates of total and intravenous-related needlestick injuries compared to control groups. The PBC group had lower rates of total and intravenous-related needlestick injuries per 1,000 patient-days (rate ratios [RR], 0.32 and 0.24; 95°% confidence intervals [CI95], 0.12-0.81 and 0.09-0.61;P=.02 andP=.003, respectively) and per 1,000 productive hours worked (RR, 0.11 and 0.08; CI95, 0.01-0.92 and 0.010.69;P=.03 andP=.005, respectively) compared to controls.Conclusions:Needlestick injuries continued in study areas despite the introduction of needleless devices, and risks of bloodborne pathogen transmission were similar to control areas. The PBC device group noted lower rates of needlestick injuries compared to controls, but there were problems with product acceptance, correct product use, and continued traditional device use in study areas. Low needlestick injury rates make interpretations difficult. Further studies of safety devices are needed and should attempt greater control of worker behavior to aid interpretation.

scholarly journals Exploring how groundwater buffers the influence of heatwaves on vegetation function during multi-year droughts

2021 ◽  
Vol 12 (3) ◽  
pp. 919-938
Author(s):  
Mengyuan Mu ◽  
Martin G. De Kauwe ◽  
Anna M. Ukkola ◽  
Andy J. Pitman ◽  
Weidong Guo ◽  
...  
Keyword(s):  
Land Surface ◽  
Forest Canopy ◽  
Climate Models ◽  
Root Zone ◽  
Stomatal Closure ◽  
Capillary Rise ◽  
Vapour Pressure Deficit ◽  
Global Climate Models ◽  
Surface Model ◽  
The Impact

Abstract. The co-occurrence of droughts and heatwaves can have significant impacts on many socioeconomic and environmental systems. Groundwater has the potential to moderate the impact of droughts and heatwaves by moistening the soil and enabling vegetation to maintain higher evaporation, thereby cooling the canopy. We use the Community Atmosphere Biosphere Land Exchange (CABLE) land surface model, coupled to a groundwater scheme, to examine how groundwater influences ecosystems under conditions of co-occurring droughts and heatwaves. We focus specifically on south-east Australia for the period 2000–2019, when two significant droughts and multiple extreme heatwave events occurred. We found groundwater plays an important role in helping vegetation maintain transpiration, particularly in the first 1–2 years of a multi-year drought. Groundwater impedes gravity-driven drainage and moistens the root zone via capillary rise. These mechanisms reduced forest canopy temperatures by up to 5 ∘C during individual heatwaves, particularly where the water table depth is shallow. The role of groundwater diminishes as the drought lengthens beyond 2 years and soil water reserves are depleted. Further, the lack of deep roots or stomatal closure caused by high vapour pressure deficit or high temperatures can reduce the additional transpiration induced by groundwater. The capacity of groundwater to moderate both water and heat stress on ecosystems during simultaneous droughts and heatwaves is not represented in most global climate models, suggesting that model projections may overestimate the risk of these events in the future.

scholarly journals IMPACT OF REGIONAL DISTRIBUTION AND AIR POLLUTION ON INTERNAL STRUCTURE OF MELIA AZEDARACH L. LEAVES

2021 ◽  
Vol 52 (6) ◽  
pp. 1326-1333
Author(s):  
V. Abozaid ◽  
H. Arif Abdulrahman ◽  
D. Ayoub Ibrahim
Keyword(s):  
Air Pollution ◽  
Leaf Area ◽  
Urban Areas ◽  
Regional Distribution ◽  
Industrial Area ◽  
Control Area ◽  
Melia Azedarach ◽  
Layer Width ◽  
Anatomical Features ◽  
The Impact

This study was performed to investigate the impact of air pollution on leaf area and anatomical features of Melia azedarach L. trees, in urban areas with three demographical classes: location (I) industrial area, location (II) roadside area and free parts (control area) as a location (III) of Duhok city/Kurdistan Region-Iraq, during July 2021. The results demonstrated that the leaf area of selected plants' leaves in location I had reduced with no noticeable change in the average stomata density in the three locations I, II and Ⅲ. Meanwhile, the results of the most anatomical features of the blade (blade, lower cuticle, epidermis (both upper and lower) thickness, palisade layer height and spongy parenchyma width) in addition to midrib parameters (epidermis thickness (upper and lower), collenchyma and parenchyma layer width, phloem and xylem width and pith diameter) were decreased in both locations I, II, and with well-developed anatomical features in location III.

scholarly journals Effects of soil rewetting and thawing on soil gas fluxes: a review of current literature and suggestions for future research

2011 ◽  
Vol 8 (5) ◽  
pp. 9847-9899 ◽  
Author(s):  
D.-G. Kim ◽  
R. Vargas ◽  
B. Bond-Lamberty ◽  
M. R. Turetsky
Keyword(s):  
Climate Models ◽  
Gas Production ◽  
Global Climate Models ◽  
Soil Gas ◽  
Future Research ◽  
High Temporal Resolution ◽  
Short Term ◽  
Frozen Soils ◽  
Gas Fluxes ◽  
The Impact

Abstract. The rewetting of dry soils and the thawing of frozen soils are short-term, transitional phenomena in terms of hydrology and the thermodynamics of soil systems. The impact of these short-term phenomena on larger scale ecosystem fluxes has only recently been fully appreciated, and a growing number of studies show that these events affect various biogeochemical processes including fluxes of soil gases such as carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), ammonia (NH3) and nitric oxide (NO). Global climate models predict that future climatic change is likely to alter the frequency and intensity of drying-rewetting events and thawing of frozen soils, highlighting the importance of understanding how rewetting and thawing will influence soil gas fluxes. Here we summarize findings in a new database based on 338 studies conducted from 1956 to 2010, and highlight open research questions. The database revealed conflicting results following rewetting and thawing in various terrestrial ecosystems, ranging from large increases in gas fluxes to non-significant changes. An analysis of published field studies (n = 142) showed that after rewetting or thawing, CO2, CH4, N2O, NO and NH3 fluxes increase from pre-event fluxes following a power function, with no significant differenced among gases. We discuss possible mechanisms and controls that regulate flux responses, and note that a high temporal resolution of flux measurements is critical to capture rapid changes in gas fluxes after these soil perturbations. Finally, we propose that future studies should investigate the interactions between biological (i.e. microbial community and gas production) and physical (i.e. flux, diffusion, dissolution) changes in soil gas fluxes, and explore synergistic experimental and modelling approaches.

scholarly journals Reaksi Sultan dan Masyarakatnya terhadap Pendudukan Militer Jepang di Bima

2020 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Yusuf Yusuf
Keyword(s):  
Social Order ◽  
Agricultural Land ◽  
Control Area ◽  
Historical Science ◽  
Japanese Occupation ◽  
South Sulawesi ◽  
The People ◽  
The Social ◽  
Local Residents ◽  
The Impact

Penelitian ini bertujuan untuk mendeskripsikan latar belakang Jepang di Bima dan reaksi Sultan dan masyarakat Bima terhadap kedatangan Jepang serta dampaknya terhadap masyarakat. Penelitian ini menggunakan pendekatan ilmu sejarah, sehingga tahap penelitian yang dilakukan adalah (1) Heuristik atau pengumpulan data, (2) Kritik (3) Interprtasi dan (4) Historiografi. Hasil penelitian menunjukkan bahwa bahwa Berdasarkan  pada pembagian wilayah kontrol pendudukan Jepang di Bima bahwa kawasan Indonesia bagian timur berada di bawah kontrol Armada (Angkatan) Laut yang berpusat di Makassar. Setelah menduduki Sulawesi Selatan pada tanggal 9 Februari 1942, Jepang terus melakukan gerak invasinya ke Nusa Tenggara, antara lain Kupang di Nusa Tenggara Timur (NTT) serta Bima di Kepulauan Sumbawa. Armada Laut Jepang dibawah pimpinan Kolonel Saito mendarat di Pelabuhan Bima pada tanggal 17 Juli 1942. Kedatangannya di sambut baik oleh penduduk setempat, sekalipun mereka (masyarakat Bima) di selimuti rasa khawatir atas rencana Asisten Residen Belanda, H.E. Haak untuk kembali berkuasa di Bima, karena itu dengan mudah Jepang menduduki Bima. Dampak keberadaan Jepang di Bima dibidang sosial diantaranya terjadi keresahan sosial dan porak-porandanya tata kehidupan sosial masyarakat. Agama dan adat yang selama ini dijunjung tinggi oleh masyarakat “terpaksa” harus dilanggar. Sementara dampak dibidang Ekonomi, berupa keterpurukkan Ekomomi, sebab masyarakat tidak lagi mencurahkan perhatian sepenuhnya untuk mengolah lahan pertaniannya. Penderitaan masyarakat berakhir setelah Jepang kalah dan menyerah tanpa syarat kepada sekutu pada bulan Agustus 1945. Sejak itu, pemerintahan pendudukan Jepang berakhir di Bima khususnya dan Indonesia pada umumnya. Kata Kunci: Pendudukan, Japang di BimaAbstractThis study aims to describe the background of Japan in Bima and the reaction of the Sultan and the people of Bima to the arrival of Japan and its impact on society. This study uses a historical science approach, so the stages of research carried out are (1) Heuristics or data collection, (2) Criticism (3) Interpretation and (4) Historiography. The results showed that based on the division of the Japanese occupation control area in Bima that the eastern part of Indonesia was under the control of the Naval Fleet (Force) based in Makassar. After occupying South Sulawesi on February 9, 1942, Japan continued to make its invasion moves to Nusa Tenggara, including Kupang in East Nusa Tenggara (NTT) and Bima in the Sumbawa Islands. The Japanese Sea Fleet under the leadership of Colonel Saito landed at the Port of Bima on July 17, 1942. His arrival was welcomed by local residents, even though they (the Bima people) were shrouded in worry over the plan of the Assistant Resident of the Netherlands, H.E. Haak to return to power in Bima, because it easily Japan occupied Bima. The impact of the existence of Japan in Bima in the social field included social unrest and ruins of the social order of the community. Religion and customs that have been upheld by the community are "forced" to be violated. While the impact on the economy, in the form of deterioration in the economy, is because the community no longer pays full attention to cultivate its agricultural land. The suffering of the people ended after Japan's defeat and surrender unconditionally to the allies in August 1945. Since then, the Japanese occupation government ended in Bima in particular and Indonesia in general. Keywords: Occupation, Japanese in Bima

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