文献类型：期刊文献

中文题名：Soil respiration and its partitioning in different components in tropical primary and secondary mountain rain forests in Hainan Island,china

作者：Lai Jiang[1] Suhui Ma[1] Zhang Zhou[2] Tianli Zheng[1] Xingxing Jiang[1] Qiong Cai[1] Peng Li[1] Jianxiao Zhu[1] Yide Li[2] Jingyun Fang[1]

第一作者：Lai Jiang

机构：[1]Department of Ecology,College of Urban and Environmental Science,and Key Laboratory for Earth Surface Processes of the Ministry of Education,Peking University,No.5 Yiheyuan Road Haidian District,Beijing 100871,P.R.China;[2]Research Institute of Tropical Forestry,Chinese Academy of Forestry,682,Guangshan 1 Rd.,Tianhe District,Guangzhou 520510,P.R.China

年份：2017

卷号：10

期号：5

起止页码：791-799

中文期刊名：植物生态学报（英文版）

外文期刊名：Journal of Plant Ecology

收录：Scopus;CSCD:【CSCD2017_2018】；

基金：National Natural Science Foundation of China(31321061,31330012);National Basic Research Program of China on Global Change(2014CB954001).

语种：英文

中文关键词：soil respiration;litter;root;mineral soil;temperature sensitivity;tropical mountain rain forest

分类号：S71

摘要：Aims Soil respiration is one of the most important components in the car-bon(c)cycle in terrestrial ecosystems.to investigate the contribution of each component of c cycle to the total soil c efflux,we quantified the rates of litter,root,and other mineral soil respiration from 2012 to 2014 in the primary and secondary tropical mountain rain forests in Hainan Island,china.Methods the seasonal dynamics of soil(Rs),non-litter(RNL)and non-root(RNR)respiration rates were measured using an automatic chamber system(Li-8100).Litter removal and root removal treatments were used to assess the contribution of litter and roots to belowground c production.We estimated the annual c efflux of each compo-nent of soil respiration in primary and secondary forests using a temperature-based exponential model and analyzed the impact of each component in each forest type.Important Findingsthe annual total soil c efflux was significantly higher in the primary rain forest(1567±205 g c m^(?2)yr^(?1))than that in the secondary forest(1300±70 g c m^(?2)yr^(?1),P<0.05).the litter,root,and mineral soils contributed 22%(349±185 g c m^(?2)yr^(?1)),38%(589±100 g c m^(?2)yr^(?1)),and 40%(628±128 g c m^(?2)yr^(?1))to the total soil c efflux in primary rain forest,respectively.In secondary forest,these three components contributed 11%(148±35 g c m^(?2)yr^(?1)),45%(572±259 g c m^(?2)yr^(?1)),and 44%(580±226 g c m^(?2)yr^(?1)),respectively.the temperature sensitivity(Q10)of Rs(2.70±0.14)in the primary forest was significantly higher than that in the secondary forest(2.34±0.12),with the Q10 values for respiration decreasing in the order of RNR>Rs>RNL.these results show that the difference in litter respiration between primary and secondary forest caused the major difference in annual soil respiration efflux between these two forest types.In addition,the litter respiration is more sensitive to the soil temperature than the other soil respiration components.