Re‐examining forest disturbance thresholds for managing cumulative hydrological impacts

Ecohydrology ◽  
2021 ◽  
Author(s):  
Xiaohua Wei ◽  
Yiping Hou ◽  
Mingfang Zhang ◽  
Qiang Li ◽  
Krysta Giles‐Hansen
Keyword(s):  
Forest Disturbance ◽  
Hydrological Impacts

Effects of forest disturbance on the movement of ground-dwelling invertebrates

2016 ◽  
Author(s):  
Kayla I Perry
Keyword(s):  
Forest Disturbance

scholarly journals A foci cohort analysis to monitor successful and persistent foci under Thailand’s Malaria Elimination Strategy

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Prayuth Sudathip ◽  
Suravadee Kitchakarn ◽  
Jui A. Shah ◽  
Donal Bisanzio ◽  
Felicity Young ◽  
...  
Keyword(s):  
Malaria Elimination ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Forest Disturbance ◽  
Cohort Analysis ◽  
Information Criteria ◽  
Factors Associated ◽  
Malaria Burden ◽  
Hazards Model ◽  
Autochthonous Transmission

Abstract Background Thailand’s success in reducing malaria burden is built on the efficient “1-3-7” strategy applied to the surveillance system. The strategy is based on rapid case notification within 1 day, case investigation within 3 days, and targeted foci response to reduce the spread of Plasmodium spp. within 7 days. Autochthonous transmission is still occurring in the country, threatening the goal of reaching malaria-free status by 2024. This study aimed to assess the effectiveness of the 1-3-7 strategy and identify factors associated with presence of active foci. Methods Data from the national malaria information system were extracted from fiscal years 2013 to 2019; after data cleaning, the final dataset included 81,012 foci. A Cox’s proportional hazards model was built to investigate factors linked with the probability of becoming an active focus from 2015 to 2019 among foci that changed status from non-active to active focus during the study period. We performed a model selection technique based on the Akaike Information Criteria (AIC). Results The number of yearly active foci decreased from 2227 to 2013 to 700 in 2019 (68.5 %), and the number of autochthonous cases declined from 17,553 to 3,787 (78.4 %). The best Cox’s hazard model showed that foci in which vector control interventions were required were 18 % more likely to become an active focus. Increasing compliance with the 1-3-7 strategy had a protective effect, with a 22 % risk reduction among foci with over 80 % adherence to 1-3-7 timeliness protocols. Other factors associated with likelihood to become or remain an active focus include previous classification as an active focus, presence of Plasmodium falciparum infections, level of forest disturbance, and location in border provinces. Conclusions These results identified factors that favored regression of non-active foci to active foci during the study period. The model and relative risk map align with the national malaria program’s district stratification and shows strong spatial heterogeneity, with high probability to record active foci in border provinces. The results of the study may be useful for honing Thailand’s program to eliminate malaria and for other countries aiming to accelerate malaria elimination.

scholarly journals The composition and diversity of natural regeneration of tree species in gaps under different intensities of forest disturbance

2021 ◽  
Author(s):  
Maame Esi Hammond ◽  
Radek Pokorný ◽  
Daniel Okae-Anti ◽  
Augustine Gyedu ◽  
Irene Otwuwa Obeng
Keyword(s):  
Tree Species ◽  
Natural Regeneration ◽  
Forest Disturbance ◽  
Forest Site ◽  
Gap Formation ◽  
Tree Species Composition ◽  
Forest Sites ◽  
Significant Difference ◽  
Shade Tolerant Species ◽  
Disturbed Forest

AbstractThe positive ecological interaction between gap formation and natural regeneration has been examined but little research has been carried out on the effects of gaps on natural regeneration in forests under different intensities of disturbance. This study evaluates the composition, diversity, regeneration density and abundance of natural regeneration of tree species in gaps in undisturbed, intermittently disturbed, and disturbed forest sites. Bia Tano Forest Reserve in Ghana was the study area and three gaps each were selected in the three forest site categories. Ten circular subsampling areas of 1 m2 were delineated at 2 m spacing along north, south, east, and west transects within individual gaps. Data on natural regeneration < 350 cm height were gathered. The results show that the intensity of disturbance was disproportional to gap size. Species diversity differed significantly between undisturbed and disturbed sites and, also between intermittently disturbed and disturbed sites for Simpson’s (1-D), Equitability (J), and Berger–Parker (B–P) indices. However, there was no significant difference among forest sites for Shannon diversity (H) and Margalef richness (MI) indices. Tree species composition on the sites differed. Regeneration density on the disturbed site was significantly higher than on the two other sites. Greater abundance and density of shade-dependent species on all sites identified them as opportunistic replacements of gap-dependent pioneers. Pioneer species giving way to shade tolerant species is a natural process, thus make them worst variant in gap regeneration.

Differences in forest disturbance among land ownership types in Poland during and after socialism

2009 ◽  
Vol 4 (1-2) ◽  
pp. 73-83 ◽  
Author(s):  
T. Kuemmerle ◽  
J. Kozak ◽  
V. C. Radeloff ◽  
P. Hostert
Keyword(s):  
Forest Disturbance ◽  
Land Ownership ◽  
Ownership Types

scholarly journals Over half of western United States' most abundant tree species in decline

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hunter Stanke ◽  
Andrew O. Finley ◽  
Grant M. Domke ◽  
Aaron S. Weed ◽  
David W. MacFarlane
Keyword(s):  
United States ◽  
Tree Species ◽  
Tree Mortality ◽  
Temperate Forests ◽  
Size Structure ◽  
Forest Disturbance ◽  
Population Decline ◽  
Western United States ◽  
Scale Transformation ◽  
Forest Composition

AbstractChanging forest disturbance regimes and climate are driving accelerated tree mortality across temperate forests. However, it remains unknown if elevated mortality has induced decline of tree populations and the ecological, economic, and social benefits they provide. Here, we develop a standardized forest demographic index and use it to quantify trends in tree population dynamics over the last two decades in the western United States. The rate and pattern of change we observe across species and tree size-distributions is alarming and often undesirable. We observe significant population decline in a majority of species examined, show decline was particularly severe, albeit size-dependent, among subalpine tree species, and provide evidence of widespread shifts in the size-structure of montane forests. Our findings offer a stark warning of changing forest composition and structure across the western US, and suggest that sustained anthropogenic and natural stress will likely result in broad-scale transformation of temperate forests globally.

Unraveling the drivers of intensifying forest disturbance regimes in Europe

2011 ◽  
Vol 17 (9) ◽  
pp. 2842-2852 ◽  
Author(s):  
RUPERT SEIDL ◽  
MART-JAN SCHELHAAS ◽  
MANFRED J. LEXER
Keyword(s):  
Forest Disturbance ◽  
Disturbance Regimes

scholarly journals Hydrological Impacts of Warmer and Wetter Climate in Troutlake and Sturgeon River Basins in Central Canada

2014 ◽  
Vol 28 (15) ◽  
pp. 5319-5333 ◽  
Author(s):  
Woonsup Choi ◽  
Sung Joon Kim ◽  
Mark Lee ◽  
Kristina Koenig ◽  
Peter Rasmussen
Keyword(s):  
River Basins ◽  
Hydrological Impacts ◽  
Central Canada

Impacts of an invasive plant are fundamentally altered by a co-occurring forest disturbance

Ecology ◽  
2017 ◽  
Vol 98 (8) ◽  
pp. 2133-2144 ◽  
Author(s):  
Noah W. Sokol ◽  
Sara E. Kuebbing ◽  
Mark A. Bradford
Keyword(s):  
Invasive Plant ◽  
Forest Disturbance
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