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Vegetation and ecosystem carbon recovery following shifting cultivation in MizoramManipur-Kachin rainforest eco-region,Southern Asia

引用

Ecological Processes 2020年第1期9卷 236-248页

作者： Anudip Gogoi Uttam Kumar Sahoo Hemanta Saikia Department of Forestry Mizoram UniversityAizawl 796004India College of Sericulture Assam Agricultural UniversityJorhat 785013India

Background:Shifting cultivation(locally known as“jhum”)is a major driver of deforestation and loss of ecosystem services in *** developing any effective conservation of biodiversity and carbon service program,an indepth understanding to the recovery of vegetation and carbon after abandonment of jhum is *** estimated species richness,abundance and composition of trees,shrubs and herbs,carbon distribution in aboveground and belowground components along a chronosequence of jhum fallow in northeast India,and elucidated the factors affecting the recovery processes of jhum ***:Species composition and other plant community attributes,carbon storage in different pools were studied in 5 jhum fallows(<5,5-10,11-15,16-20,21-25 years old)and an old-growth *** data were subjected to linear mixed effect modeling using R-package“nlme”for identifying the important factors contributing to the recovery of vegetation and ***:Species composition varied significantly(P<0.05)between jhum fallows and old-growth *** density varied from 28 stems ha−1 in 5 years old jhum fallow to 163 stems ha−1 in old-growth *** biomass carbon in all components and soil organic carbon were significantly(P=0.01)lower in jhum fallows than in the old-growth forest except living non-woody biomass *** recovery of aboveground biomass carbon was faster during early successive years than the mid-successive jhum *** ecosystem carbon and soil organic carbon stock in the oldest jhum fallow was 33%and 62%of those in the old-growth forest,*** fallow age was found to be the most important explanatory factor in the recovery process of vegetation and carbon stock in re-growing ***:The shifting cultivation fallows gradually recovered both vegetation and carbon and are potential repository sites for biodiversity conservation,which may take much longer time to reach up to old-growth forest in northeast India.

关键词： Biodiversity conservation Regrowth forest Vegetation succession Carbon storage restoration of degraded land

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