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- Title
Effects of human disturbance on soil aggregates content and their organic C stability in Karst regions.
- Authors
WEI Ya?wei; SU Yi?rong; CHEN Xiang?bi; HE Xun?yang; QIN Wen?geng; WEI Guo?fu
- Abstract
Taking the primary forest land (PF), natural restoration land (NR), grazing grassland burned annually in winter (GB), and maize鄄sweet potato cropland (MS) in Karst regions of North鄄west Guangxi as test objects, this paper studied the soil aggregates content and their organic C stability in the four ecosystems under different human disturbance patterns. The soil water鄄stable aggregates (>0郾25 mm) content in PF, NR, and GB accounted for more than 70%, while that in MS was only 37%. The destruction rate of soil aggregates structure in the four ecosystems decreased in the sequence of MS (54郾9%) > GB (23郾2%) > NR (9郾8%) and PF (9郾6%), with significant differences among them (P<0郾05). With increasing incubation time, the mineralization rate of soil aggregate organic C decreased after an initial increase and kept stable after 20 days, and increased with decreasing aggregate size. In the same size aggregates, the mineralization rate of organic C in the four ecosystems increased in the sequence of MS < GB and NR < PF. In PF, the mineralization ratio of soil organic C was 1郾7% -3郾8%, being significantly higher than that in NR, GB, and MS.The cumulative mineralization amount of soil organic C had the same change trend with the mineralization rate. The contents of soil organic C and aggregate organic C were significantly positively correlated with the mineralization rate and cumulative mineralization amount of organic C, respectively, and significantly negatively correlated with the mineralization ratio of organic C.
- Subjects
CHINA; SOIL structure; BIOTIC communities; CARBON in soils; SOIL mineralogy
- Publication
Yingyong Shengtai Xuebao, 2011, Vol 22, Issue 4, p971
- ISSN
1001-9332
- Publication type
Article