Effects of land use change on ecosystem carbon stock in semi-arid region.
Land use change has remarkable effects on ecosystem carbon(C)stock.To evaluate the carbon sequestration capability of terrestrial ecosystem under different land use types is of significance in the ecosystem management,and in mitigating the impact of global climate change.Taking sandy grassland(SG),sparse woodland mixed with Pinus sylvestrit-Armeniaca sibirica (SW),and poplar shelterbelt(PS)as test objectives,a quantitative study was made on the ecosyrstem C stock and allocation under effects of land use chamges.After the conversion from SG to PS and SW,the aboveground C stock increased at a rate of 0.17 t·hm~(-2)·a~(-1) in SW and 4.45 t·hm~(-2)·a~(-1) in PS.In SG,SW,and PS,the root C stock was 1.382 t·hm~(-2),1.706 t·hm~(-2),and 18.541 t·hm~(-2),and the soil C stock was 26.11 t·hm~(-2),25.20 t·hm~(-2) and 41.36 t·hm~(-2),respectively.The root-and soil C stocks in PS after conversed from SG increased at a rate of 1.07 t·hm~(-2)·a~(-1) and 0.95 t·hm~(-2)·a~(-1),respectively.Among the three land-use types,SW had the least variation of C content and stock between soil layers.As a whole,the total C stock was the highest in PS(131.9 t·hm~(-2)),followed by in SW (30.0 t·hm~(-2)),and in SG(28.3 t·hm~(-2)).
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万方数据
维普
