Above- and belowground carbon inputs affect seasonal variations of soil microbial biomass in a subtropical monsoon forest of southwest China

被引:63
作者
Feng, Wenting [1 ]
Zou, Xiaoming [1 ,2 ]
Schaefer, Douglas [1 ]
机构
[1] Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Forest Ecosyst Res Ctr, Kunming 650223, Yunnan, Peoples R China
[2] Univ Puerto Rico, Inst Trop Ecosyst Studies, Rio Piedras, PR 00931 USA
关键词
Girdling; Litter removal; Root trenching; Seasonal variation; Soil microbial biomass; Subtropical forest; LITTER DECOMPOSITION; TROPICAL FORESTS; NORTHEAST INDIA; ORGANIC-CARBON; WET FOREST; CO2; EFFLUX; ECOSYSTEM; DYNAMICS; ENVIRONMENT; RESPONSES;
D O I
10.1016/j.soilbio.2008.10.002
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Soil microbial activity drives carbon and nutrient cycling in terrestrial ecosystems. Soil microbial biomass is commonly limited by environmental factors and soil carbon availability. We employed plant litter removal, root trenching and stem-girdling treatments to examine the effects of environmental factors, above- and belowground carbon inputs on soil microbial C in a subtropical monsoon forest in southwest China. During the experimental period from July 2006 through April 2007, 2 years after initiation of the treatments, microbial biomass C in the humus layer did not vary with seasonal changes in soil temperature or water content. Mineral soil microbial C decreased throughout the experimental period and varied with soil temperature and water content. Litter removal reduced mineral soil microbial C by 19.0% in the ungirdled plots, but only 4.0% in girdled plots. Root trenching, stem girdling and their interactions influenced microbial C in humus layer. Neither root trenching nor girdling significantly influenced mineral soil microbial C. Mineral soil microbial C correlated with following-month plant litterfall in control plots, but these correlations were not observed in root-trenching plots or girdling plots. Our results suggest that belowground carbon retranslocated from shoots and present in soil organic matter, rather than aboveground fresh plant litter inputs, determines seasonal fluctuation of mineral soil microbial biomass. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:978 / 983
页数:6
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