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Species-dependent responses of soil microbial properties to fresh leaf inputs in a subtropical forest soil in South China

引用

Journal of Plant Ecology 2014年第1期7卷 86-96页

作者： Faming Wang Jin Liu Bi Zou deborah a.neher Weixing Zhu Zhian Li Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesGuangzhou 510160China University of Chinese Academy of Science Beijing 100049China Department of Plant and Soil Science University of VermontBurlington VT 05405USA Department of Biological Sciences State University of New York-BinghamtonBinghamtonNY 13902USA

Aims Forest disturbance from extreme weather events due to climate change could increase the contribution of fresh green leaves to the litter layer of soil and subsequently alter the composition and activity of the soil microbial properties and soil carbon *** objective of this study was to compare the effect of naturally fallen litter and fresh leaves on the soil microbial community composition and their *** Fresh leaves and normal fallen litter were collected from four tree species(Pinus elliottii,Schima superba,Acacia mangium,***)in subtropical China and mixed with *** microbial community composition was determined using PLFAs,and its activity was quantified by soil *** a 12-month period,the decomposition rate of litter was measured bimonthly using a litterbag *** microbial samples were collected after 6 and 12 *** respiration was measured *** Findings We found that fresh leaves decomposed faster than their conspecific fallen *** total microbial biomass and bacterial biomass were similar among treatments,soil fungal biomass was higher in fresh leaf than fallen litter treatments,resulting in greater values of the Fungal phospholipid fatty acids(PLFAs)/Bacterial PLFAs *** PLFA values were greater for Schima superba than the other *** effect of litter type on soil respiration was ***,fallen litter released 35%more CO_(2) than fresh leaves of the conifer *** opposite pattern was observed in the broadleaf species whose fresh leaf treatments emitted 17%–32%more CO_(2) than fallen *** future predictions that global climate change will cause more disturbances to forests,these results indicate that conifer and broadleaf forests in subtropical China may respond differently to increased fresh litter inputs,with net soil microbial respiration decreasing in conifer forests and increasing in broadleaf forests.

关键词： fresh leaf input forest disturbance soil microbial community soil respiration southern China

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