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Four years of litter input manipulation changes soil microbial characteristics in a temperate mixed forest |
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| Authors: | Dai Weiwei Peng Bo Liu Jun Wang Chao Wang Xin Jiang Ping Bai Edith |
| Institution: | 1.CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China ;2.College of Land Resource and Environment, Jiangxi Agricultural University, Nanchang, 330045, China ;3.Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Jiangxi Agricultural University, Nanchang, 330045, China ;4.College of Life Science, Resources and Environment, Yichun University, Yichun, 336000, China ;5.College of Forestry, Jiangxi Agricultural University, Nanchang, 330045, China ;6.College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China ;7.Laboratory of Geographical Processes and Ecological Security of Changbai Mountains, Ministry of Education; School of Geographical Sciences, Northeast Normal University, Changchun, 130024, China ; |
| Abstract: | Aboveground litter not only is an important source of nutrients to soil microbes but also regulates the microclimate in topsoil. How the changes in aboveground litter quantity would affect the microbial biogeochemical cycles is still unclear. Here we conducted a litter input manipulation experiment in a temperate mixed forest to investigate how different amounts of litter input affect soil organic carbon (SOC) and soil respiration via their regulation on soil microbes. We found that although neither SOC stock nor soil CO2 efflux was affected by litter manipulation, soil microbial characteristics had responded after four years of litter addition or removal treatments. Microbial biomass carbon (MBC) in the O horizon was higher in litter addition plots than in litter removal plots as a result of the changed availability of labile C under litter treatments. Both double litter and no litter treatments changed microbial compositions, which was probably due to the increased soil pH in no litter treatment and the increased labile C in double litter treatment. The null change in soil respiration could be attributed to the offset between the negative effect of decreased substrate and the positive effect of increased temperature on soil respiration in litter removal plots. Due to the important role of soil microbes in carbon cycling, the altered microbial properties under litter manipulation treatments suggested the inevitable changes in biogeochemical cycling in the long run and call for long-term studies on SOC dynamics in the future. |
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