Soil depth- and root diameter- related variations affect root decomposition in temperate pine and oak forests

作     者：Seung Hyun Han Seongjun Kim Hanna Chang Hyun-Jun Kim Asia Khamzina Yowhan Son 

作者机构：Department of Environmental Science and Ecological EngineeringGraduate SchoolKorea UniversityAnam-DongSeongbuk-GuSeoul 02841Republic of Korea 

出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)

年 卷 期：2019年第12卷第5期

页      面：871-881页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：National Research Foundation of Korea(2018R1A2B6001012) 

主　　题：decomposition stage litter quality soil environmental condition soil microbial activity 

摘      要：Aims Assessment of factors regulating root decomposition is needed to understand carbon and nutrient cycling in forest *** ob-jective of this study is to examine the effects of soil depth and root diameter on root decomposition and to analyze the relationship of root decomposition with factors such as soil environmental conditions and initial litter *** two decomposition experiments were conducted in natural pine(Pinus densiflora)and oak(Quercus serrata)forests over a 2-year period using the litterbag *** the soil depth experiment,216 litterbags containing fine roots(∅=0-2 mm)were buried at 0-10-,10-20-and 20-30-cm soil *** properties and soil enzyme activities and microbial biomass at each soil depth were *** the root diameter experiment,216 litterbags containing roots 0-1-,1-2-and 2-3-mm in diameter were buried at 10-cm soil *** initial litter qualities(carbon(c),nitrogen(N),calcium(ca)and phosphorus(P)concentrations)for each of the root diameter classes were *** were retrieved after 3,6,12 and 24 months in each forest *** Findingsthe root decomposition rate was significantly altered by soil depth and root *** 2 years,the root decay constant at 0-10-cm depth(pine:0.35 and oak:0.41)was significantly higher than that at 10-20-cm(0.31 and 0.37)and 20-30-cm(0.32 and 0.33)depths in the *** and *** *** activities and microbial biomass declined with soil depth,which may be associated with decreasing soil moisture and organic *** decay constant for the 0-1-mm roots(pine:0.32 and oak:0.37)was higher than that of 1-2-mm(0.29 and 0.33)and 2-3-mm roots(0.26 and 0.33)for the *** and *** *** in initial P concentration and c/N ratio among the different diameter roots were linearly related with root *** particular,the increasing c/N ratio with root diameter resulted in decreases in the decomposition *** re