文献类型：期刊文献

英文题名：Temperature and substrate availability regulate soil respiration in the tropical mountain rainforests, Hainan Island, China

作者：Zhou, Zhang[1,2] Jiang, Lai[1] Du, Enzai[1] Hu, Huifeng[3] Li, Yide[4] Chen, Dexiang[4] Fang, Jingyun[1]

第一作者：Zhou, Zhang

通信作者：Zhou, Z[1]

机构：[1]Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China;[2]Peking Univ, Shenzhen Grad Sch, Sch Urban Planning & Design, Shenzhen 518055, Peoples R China;[3]Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China;[4]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China

年份：2013

卷号：6

期号：5

起止页码：325-334

外文期刊名：JOURNAL OF PLANT ECOLOGY

收录：;Scopus(收录号：2-s2.0-84885040833);WOS:【SCI-EXPANDED(收录号:WOS:000324828500002)】；

基金：National Basic Research Program of China on Global Change (2010CB950600), National Natural Science Foundation of China (#31021001) and Ministry of Science and Technology (2010DFA31290).

语种：英文

外文关键词：soil respiration; soil temperature; litter; tropical mountain rainforest

摘要：Tropical forest plays a key role in global C cycle; however, there are few studies on the C budget in the tropical rainforests in Asia. This study aims to (i) reveal the seasonal patterns of total soil respiration (R-T), litter respiration (R-L) and soil respiration without surface organic litter (R-NL) in the primary and secondary Asian tropical mountain rainforests and (ii) quantify the effects of soil temperature, soil moisture and substrate availability on soil respiration. The seasonal dynamics of soil CO2 efflux was measured by an automatic chamber system (Li-8100), within the primary and secondary tropical mountain rainforests located at the Jianfengling National Reserve in Hainan Island, China. The litter removal treatment was used to assess the contribution of litter to belowground CO2 production. The annual R-T was higher in the primary forest (16.730.87 Mg C ha(1)) than in the secondary forest (15.100.26 Mg C ha(1)). The rates of R-T, R-NL and R-L were all significantly higher in the hot and wet season (MayOctober) than those in the cool and dry season (NovemberApril). Soil temperature at 5cm depth could explain 5561% of the seasonal variation in R-T, and the temperature sensitivity index (Q(10)) ranked by R-L (Q(10) 3.39) > R-T (2.17) > R-NL (1.76) in the primary forest and by R-L (4.31) > R-T (1.86) > R-NL (1.58) in the secondary forest. The contribution of R-L to R-T was 2223%, while litter input and R-T had 1 month time lag. In addition, the seasonal variation of R-T was mainly determined by soil temperature and substrate availability. Our findings suggested that global warming and increased substrate availability are likely to cause considerable losses of soil C in the tropical forests.