文献类型：期刊文献

英文题名：Rates of Litter Decomposition and Soil Respiration in Relation to Soil Temperature and Water in Different-Aged Pinus massoniana Forests in the Three Gorges Reservoir Area, China

作者：Xiao, Wenfa[1] Ge, Xiaogai[1,2] Zeng, Lixiong[1] Huang, Zhilin[1] Lei, Jingpin[3] Zhou, Benzhi[2] Li, Maihe[4,5]

通信作者：Xiao, WF[1]

机构：[1]Chinese Acad Forestry, State Forestry Adm, Key Lab Forest Ecol & Environm, Res Inst Forest Ecol Environm & Protect, Beijing, Peoples R China;[2]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang, Zhejiang, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forestry, Key Lab Forest Silviculture, State Forestry Adm, Beijing, Peoples R China;[4]Swiss Fed Res Inst WSL, Birmensdorf, Switzerland;[5]Chinese Acad Sci, Inst Appl Ecol, State Key Lab Forest & Soil Ecol, Shenyang 110016, Peoples R China

年份：2014

卷号：9

期号：7

外文期刊名：PLOS ONE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000339242700083)】；

基金：This work was supported by the Special Research Programme In Forestry Industry, State Forestry Administration of China (Project No. 201104008), National 'Twelfth Five-Year'' Plan for Science & Technology Project of China (2011BAD38B04), Zigui National Forest Ecological Research Station and CFERN&GENE Award Funds on Ecological Paper. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

语种：英文

摘要：To better understand the soil carbon dynamics and cycling in terrestrial ecosystems in response to environmental changes, we studied soil respiration, litter decomposition, and their relations to soil temperature and soil water content for 18-months (Aug. 2010-Jan. 2012) in three different-aged Pinus massoniana forests in the Three Gorges Reservoir Area, China. Across the experimental period, the mean total soil respiration and litter respiration were 1.94 and 0.81, 2.00 and 0.60, 2.19 and 0.71 mu mol CO2 m(-2) s(-1), and the litter dry mass remaining was 57.6%, 56.2% and 61.3% in the 20-, 30-, and 46-year-old forests, respectively. We found that the temporal variations of soil respiration and litter decomposition rates can be well explained by soil temperature at 5 cm depth. Both the total soil respiration and litter respiration were significantly positively correlated with the litter decomposition rates. The mean contribution of the litter respiration to the total soil respiration was 31.0%-45.9% for the three different-aged forests. The present study found that the total soil respiration was not significantly affected by forest age when P. masonniana stands exceed a certain age (e.g. >20 years old), but it increased significantly with increased soil temperature. Hence, forest management strategies need to protect the understory vegetation to limit soil warming, in order to reduce the CO2 emission under the currently rapid global warming. The contribution of litter decomposition to the total soil respiration varies across spatial and temporal scales. This indicates the need for separate consideration of soil and litter respiration when assessing the climate impacts on forest carbon cycling.