Soil Moisture Alters the Response of Soil Organic Carbon Mineralization to Litter Addition |
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Authors: | Qingkui Wang Zhangquan Zeng Micai Zhong |
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Institution: | 1.Huitong Experimental Station of Forest Ecology, State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang,People’s Republic of China;2.Huitong National Research Station of Forest Ecosystem,Huitong,People’s Republic of China;3.Hunan Academy of Forestry,Changsha,People’s Republic of China;4.Kunming Institute of Botany,Chinese Academy of Sciences,Kunming,People’s Republic of China |
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Abstract: | Increasing rainfall and longer drought conditions lead to frequent changes in soil moisture that affect soil organic carbon (SOC) mineralization. However, how soil moisture affects response of SOC mineralization to litter addition in forest ecosystems remains unexplored. We added 13C-labeled litter to subtropical forest soils with three mass water contents (L, 21%; M, 33%; H, 45%). Carbon dioxide production was monitored, and the composition of soil microbial communities was determined by phospholipid fatty acid (PLFA). When no litter was added, SOC mineralization was greater in the M-treated soil. Litter addition promoted SOC mineralization, but this promotion was altered by soil moisture and litter type. Priming effects induced by P. massoniana leaf litter in the M-moistened soil were significantly (P < 0.05) higher than those in other treatments. Litter-derived C was approximately 55% incorporated into 18:1ω9c and 16:0 PLFAs, and this proportion was not significantly affected by soil moisture. Soil moisture affected the distribution of litter-13C in i15:0, i17:0, and cy19:0 individual PLFAs. The primed C evolution was significantly related to the ratio of Gram-positive to Gram-negative bacteria. These results suggest that changes in soil moisture could affect SOC mineralization in forest ecosystems. |
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