Irrigation Practice and its Effects on Water Storage and Groundwater Fluctuation in the First Dry Season in the Rice Cultivation Region, South Sulawesi, Indonesia

AbstractTerrestrial water storage (TWS) provides important information on terrestrial hydroclimate and may have value for seasonal forecasting because of its strong persistence. We use the NASA Hydrological Forecast and Analysis System (NHyFAS) to investigate TWS forecast skill over Africa and assess its value for predicting vegetation activity from satellite estimates of leaf area index (LAI). Forecast skill is high over East and Southern Africa, extending up to 3–6 months in some cases, with more modest skill over West Africa. Highest skill generally occurs during the dry season or beginning of the wet season when TWS anomalies from the previous wet season are most likely to carry forward in time. In East Africa, this occurs prior to and during the transition into the spring “Long Rains” from January–March, while in Southern Africa this period of highest skill starts at the beginning of the dry season in April and extends through to the start of the wet season in October. TWS is highly and positively correlated with LAI, and a logistic regression model shows high cross-validation skill in predicting above or below normal LAI using TWS. Combining the LAI regression model with the NHyFAS forecasts, 1-month lead LAI predictions have high accuracy over East and Southern Africa, with reduced but significant skill at 3-month leads over smaller sub-regions. This highlights the potential value of TWS as an additional source of information for seasonal forecasts over Africa, with direct applications to some of the most vulnerable agricultural regions on the continent.

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Important Aedes Spp. Density Levels in Kinshasa, Democratic Republic of Congo

10.21203/rs.3.rs-37427/v2 ◽

2020 ◽

Author(s):

Wat’senga Tezzo Francis ◽

Fasine Sylvie ◽

Manzambi Emile Zola ◽

Marquetti Maria del Carmen ◽

Binene Mbuka Guillaume ◽

...

Keyword(s):

Species Identification ◽

Yellow Fever ◽

Democratic Republic ◽

Democratic Republic Of Congo ◽

Water Storage ◽

Dry Season ◽

Transmission Risk ◽

Cross Sectional ◽

Republic Of Congo ◽

Breeding Sites

Abstract BACKGROUND: Dengue, yellow fever, chikungunya and Zika are among the most important emerging infectious vector-borne diseases worldwide. Besides sporadic dengue cases, yellow fever and chikungunya outbreaks have been increasingly reported in Democratic Republic of Congo (DRC) in the last decade. The main vectors of these arboviruses, Aedes aegypti and Aedes albopictus, were reported in DRC, but there is a lack of detailed information on their presence and spread hampering transmission risk assessments in the region. METHODS: In 2018, two cross-sectional surveys were realized in Kinshasa province (DRC), one in the rainy (January/February) and one in the dry season (July). Four hundred houses were visited in each of the four selected communes (N’Djili, Mont Ngafula, Lingwala and Kalamu). Breedings sites were recorded, larvae and pupae collected and reared to obtain adults for genus and species identification. A subset of specimens was DNA-barcoded for validation of the morphological species identification. RESULTS: The most rural commune (Mont Ngafula) had the highest density levels, with a Breteau Index of 82.2 and 19.5/100 houses in rainy and dry season, respectively. The Breteau Index in the other communes Kalamu, Lingwala and N’Djili elevated to 21.5 (4.7), 36.7 (9.8) and 41.7 (7.5) in the rainy (and dry) season. The House index was on average 27.5% and 7.6%; and the Container Index 15.0% and 10.0% in rainy and dry season, respectively. The vast majority of Aedes positive containers was found outside the houses (adjusted OR 27.4 (95%CI 14.9-50.1)). The main breeding sites were used tires, water storage containers and trash. Anopheles larvae were also found in Aedes breeding sites, especially during the rainy season.CONCLUSIONS: These results show that Kinshasa is highly infested with Aedes spp. which indicates a high potential for arbovirus transmission in the area. During the dry season, the most productive containers (for Aedes pupae production) are containers used for water storage, whereas in the rainy season this is trash and tires. The present study also evidences that Aedes breeding sites are mainly located outdoors. Based on the results of this study, a contextualized Aedes control strategy can be designed for Kinshasa.

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DISSOLVED SILICATE IN COASTAL WATER OF SOUTH SULAWESI

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v6i2.9022 ◽

2015 ◽

Vol 6 (2) ◽

Author(s):

Muhammad Lukman ◽

Andriani Nasir ◽

Khairul Amri ◽

Rahmadi Tambaru ◽

Muhammad Hatta ◽

...

Keyword(s):

Water Quality ◽

Chlorophyll A ◽

Coastal Water ◽

Coastal Waters ◽

Dry Season ◽

Limiting Factor ◽

Western Coast ◽

Wet Season ◽

South Sulawesi ◽

Dissolved Silicate

ABSTRACT Dissolved silicate (DSi) in coastal waters plays a crucial role in phytoplankton growth particularly diatom. This study aimed to determine DSi concentration seasonally in waters of the western coast of South Sulawesi in relation to coastal water quality indicator. Water, chlorophyll-a, and diatom samples were collected from the coastal areas of the Tallo-Makassar, Maros, and Pangkep, in April 2013 (transitional season), June 2013 (dry season), and February 2014 (wet season). Factorial analysis of variance was used to identify significant seasonal and temporal variations, and linear regression was used to test the relationship of chlorophyll-a and diatom abundance to DSi concentrations. The results showed that the DSi concentration was higher in the wet season of 35.2-85.2 µM than in the other seasons (transitional season: 10.8-68.4 µM, dry season: 9.59-24.1 µM). The abundance of diatoms during the transitional season reached ~9.7x107 cell/m3 in the Pangkep river, 2.3x107 cell/m3 in the Tallo river, and 1.3 x 107 cell/m3 in the Maros river. Chaetoceros, Nitzschia, and Rhizosolenia dominated the diatom composition. The mean concentration of chlorophyll-a in the Makassar coastal waters was 4.52±4.66 mg/m3, while in the Maros and Pangkep waters of 1.40±1.06, and 2.72±1.94 mg/m3, respectively. There was no strong linear corelation between DSi and diatom abundances, nor chlorophyll-a. These results suggested that DSi become a non-limiting factor for the diatom growth and potentially reduce the water quality via eutrophication and diatom blooms. Keywords: dissolved silicate, diatom, chlorophyll-a, coastal waters, South Sulawesi

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DISSOLVED SILICATE IN COASTAL WATER OF SOUTH SULAWESI

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.28930/jitkt.v6i2.9022 ◽

2015 ◽

Vol 6 (2) ◽

Author(s):

Muhammad Lukman ◽

Andriani Nasir ◽

Khairul Amri ◽

Rahmadi Tambaru ◽

Muhammad Hatta ◽

...

Keyword(s):

Water Quality ◽

Chlorophyll A ◽

Coastal Water ◽

Coastal Waters ◽

Dry Season ◽

Limiting Factor ◽

Western Coast ◽

Wet Season ◽

South Sulawesi ◽

Dissolved Silicate

ABSTRACT Dissolved silicate (DSi) in coastal waters plays a crucial role in phytoplankton growth particularly diatom. This study aimed to determine DSi concentration seasonally in waters of the western coast of South Sulawesi in relation to coastal water quality indicator. Water, chlorophyll-a, and diatom samples were collected from the coastal areas of the Tallo-Makassar, Maros, and Pangkep, in April 2013 (transitional season), June 2013 (dry season), and February 2014 (wet season). Factorial analysis of variance was used to identify significant seasonal and temporal variations, and linear regression was used to test the relationship of chlorophyll-a and diatom abundance to DSi concentrations. The results showed that the DSi concentration was higher in the wet season of 35.2-85.2 µM than in the other seasons (transitional season: 10.8-68.4 µM, dry season: 9.59-24.1 µM). The abundance of diatoms during the transitional season reached ~9.7x107 cell/m3 in the Pangkep river, 2.3x107 cell/m3 in the Tallo river, and 1.3 x 107 cell/m3 in the Maros river. Chaetoceros, Nitzschia, and Rhizosolenia dominated the diatom composition. The mean concentration of chlorophyll-a in the Makassar coastal waters was 4.52±4.66 mg/m3, while in the Maros and Pangkep waters of 1.40±1.06, and 2.72±1.94 mg/m3, respectively. There was no strong linear corelation between DSi and diatom abundances, nor chlorophyll-a. These results suggested that DSi become a non-limiting factor for the diatom growth and potentially reduce the water quality via eutrophication and diatom blooms. Keywords: dissolved silicate, diatom, chlorophyll-a, coastal waters, South Sulawesi

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Improving irrigation management in dry season rice cultivation for optimum crop and water productivity in non-traditional rice ecologies

Irrigation and Drainage ◽

10.1002/ird.572 ◽

2011 ◽

Vol 60 (2) ◽

pp. 174-178 ◽

Cited By ~ 3

Author(s):

A. Ghosh ◽

O. N. Singh ◽

K. S. Rao

Keyword(s):

Water Productivity ◽

Irrigation Management ◽

Dry Season ◽

Rice Cultivation ◽

Rice Ecologies ◽

Traditional Rice

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Can irrigation practice for rice cultivation reduce the risk of arsenic to human?

Arsenic in the Environment - Proceedings - Arsenic Research and Global Sustainability ◽

10.1201/b20466-137 ◽

2016 ◽

pp. 283-284

Author(s):

S Islam ◽

M Rahman ◽

M Islam ◽

M Nuruzzaman ◽

R Naidu

Keyword(s):

Rice Cultivation ◽

Irrigation Practice

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Water use of rice and mung bean cultivations in a downstream area of an irrigation system in South Sulawesi in the 2nd dry season

Paddy and Water Environment ◽

10.1007/s10333-019-00766-7 ◽

2019 ◽

Vol 18 (1) ◽

pp. 87-98 ◽

Cited By ~ 1

Author(s):

Hiroki Oue ◽

Sartika Laban

Keyword(s):

Water Use ◽

Mung Bean ◽

Irrigation System ◽

Dry Season ◽

South Sulawesi ◽

Downstream Area

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FOOD CONSUMPTION AND PRODUCTION IN TEMPE LAKE, SOUTH SULAWESI, INDONESIA

Journal of Asian Rural Studies ◽

10.20956/jars.v1i1.723 ◽

2017 ◽

Vol 1 (1) ◽

pp. 43 ◽

Cited By ~ 2

Author(s):

M. Saleh S. Ali ◽

Amrullah Majika ◽

Darmawan Salman

Keyword(s):

Land Use ◽

Food Consumption ◽

Dry Season ◽

Fish Production ◽

World Food ◽

Flood Season ◽

South Sulawesi ◽

The World ◽

Production Pattern ◽

Sufficient Food

Challenges in providing sufficient food is a society problem and it will exist along with human civilization history.In this modern civilization, when the population reach more than 7 million people in the world, food consumption and production become a civilization problem and nature becomes a victim of it. Nowadays, almost 1 million people facing undernutrition and malnutritionThis study aimed to identify the pattern of food consumption and production in Tempe Lake, the biggest lake in the province or in Sulawesi island. A fieldwork conducted on February 2016 at Laelo Village (Kelurahan Laelo) that belongs to Tempe Sub-district (Kecamatan Tempe). Total respondents in this study were 72 people who were selected randomly from those have use the lake as main source of livelihood. Some informants who know more about the lake were also interviewed. Data gathered mainly about land use of the lake during dry season and wet (flood) season, and food consumption and production pattern, This research found that fish production of the lake has decreased significantly in the last 20 years due to sedimentation, overfishing and environmental contamination. People consumed various foods for their dietary but mostly consuming rice that they purchased from market and fish and vegetables from the lake. There was no different in amount of rice and fish consumed during wet and dry season.

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Two soil hydrology formulations of ORCHIDEE (version Trunk.rev1311) tested for the Amazon basin

Geoscientific Model Development Discussions ◽

10.5194/gmdd-7-73-2014 ◽

2014 ◽

Vol 7 (1) ◽

pp. 73-129

Author(s):

M. Guimberteau ◽

P. Ciais ◽

A. Ducharne ◽

J. P. Boisier ◽

S. Peng ◽

...

Keyword(s):

Soil Water ◽

Water Budget ◽

River Discharge ◽

Amazon Basin ◽

Water Storage ◽

Dry Season ◽

Soil Water Storage ◽

Surface Model ◽

Diffusion Scheme ◽

The Impact

Abstract. This study analyzes the impact of the two soil model parameterizations of the Land Surface Model ORCHIDEE on their estimates of Amazonian hydrology and phenology for five major sub-basins (Xingu, Tapajós, Madeira, Solimões and Negro), during the 29 yr period 1980–2008. The two soil models are a simple 2 layer soil scheme with a bucket topped by an evaporative layer vs. an 11 layer soil diffusion scheme. The soil models were coupled with a river routing module and a process model of plant physiology, phenology and carbon dynamics. The simulated water budget and vegetation functioning components were compared with several datasets at sub-basin scale. The use of the 11 layer soil diffusion scheme did not significantly change the Amazonian water budget simulation when compared to the 2 layer soil scheme (+3.1 and −3.0% in evapotranspiration and river discharge, respectively). However, the higher water holding capacity of the soil and the physically based representation of runoff and drainage in the 11 layer soil diffusion, resulted in higher dynamics of soil water storage variation and improved simulation of the total terrestrial water storage when compared to GRACE satellite estimates. The greater soil water storage within the 11 layer soil diffusion scheme resulted in increased dry-season evapotranspiration (+0.5 mm d−1, +17%) and river discharge in the southeastern sub-basins such as the Xingu. Evapotranspiration over this sub-basin was sustained during the whole dry season with the 11 layer soil diffusion model, whereas the 2 layer soil scheme limited it at the end of the dry season. Lower plant water stress simulated by the 11 layer soil diffusion scheme, led to better simulation of the seasonal cycle of photosynthesis (GPP) when compared to a GPP data-driven model based upon eddy-covariance and satellite greenness measurements. Simulated LAI was consequently higher with the 11LAY (up to +0.4) but exhibited too low a variation when compared to a satellite-based dataset. The dry-season length between 4 and 7 months over the entire Amazon basin was found to be critical in distinguishing differences in hydrological feedbacks between the soil and the vegetation cover simulated by the two soil models. Overall, the 11 layer soil diffusion scheme provided little improvement in simulated hydrology on average over the wet tropical Amazonian sub-basins but a more significant improvement over the drier sub-basins. However, the use of the 11 layer soil diffusion scheme might become critical for assessments of future hydrological changes, especially in southern regions of the Amazon basin where longer dry season and more severe droughts are expected in the next century.

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