文献类型：期刊文献

英文题名：Different grazing removal exclosures effects on soil C stocks among alpine ecosystems in east Qinghai-Tibet Plateau

作者：Luan, Junwei[1,3] Cui, Lijuan[1] Xiang, Chenghua[2] Wu, Jianghua[3] Song, Hongtao[1] Ma, Qiongfang[1] Hu, Zongda[4]

第一作者：Luan, Junwei

通信作者：Luan, JW[1]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China;[2]Sichuan Acad Forestry, Chengdu 610081, Peoples R China;[3]Mem Univ Newfoundland, Corner Brook, NF A2H 6P9, Canada;[4]Sichuan Agr Univ, Coll Resources & Environm, Chengdu 611130, Peoples R China

年份：2014

卷号：64

起止页码：262-268

外文期刊名：ECOLOGICAL ENGINEERING

收录：;EI(收录号：20140517257493);Scopus(收录号：2-s2.0-84892986147);WOS:【SCI-EXPANDED(收录号:WOS:000331726100031)】；

基金：We gratefully acknowledge the support of Dangzhou Hamo, Ta Baima, as well as the Zoige National Wetland Reserve for their assistance in field sampling. Thanks to Sarah Furlotte for her improvements on the language of this manuscript. Thanks to the two anonymous reviewers for their valuable comments. This study was jointly funded by China's National Natural Science Foundation (No. 31200370), the Chinese Ministry of Finance (No. 201204201), and the Research Institute of Forestry New Technology (CAFINT2011C09). JW would like to thank the financial support from Humber River Basin Research Initiative, Grenfell Campus' Start-up funding.

语种：英文

外文关键词：Grazing exclosure; Soil organic carbon quality; Soil C sequestration; Alpine marsh; Meadow; Rangelands management

摘要：Grazing removal exclosure is important to restore grass in rangeland. However, little is known about the effects of exclosure on soil organic carbon (SOC) in Qinghai-Tibet Plateau, and whether different ecosystems response equally to exclosure. In this study, we evaluated the effects of grazing removal exclosure on SOC and total nitrogen (TN) as well as SOC quality for the top soil layer (0-10 cm) through comparing three grazing-removal exclosure pairs of ecosystems (i.e., marsh, wet meadow, and meadow) in Zoige, east Qinghai-Tibet Plateau. Both SOC and labile OC (i.e. microbial biomass carbon, MBC; dissolved organic carbon, DOC; light fraction organic carbon, LFOC) were investigated. Our results indicated that the exclosures of five years old significantly increased SOC stock and marginal significantly increased soil N stock for meadow. No exclosure effects on SOC and N stocks were found for marsh and wet meadow. No significant changes of MBC and DOC were found for the three ecosystems as a consequence of five years grazing removal. However, grazing exclosures significantly increased LFOC, light fraction nitrogen (LFN), heavy fraction organic carbon (HFOC), and lability of carbon pool as determined by a density fractionation method (L-LFOC) for meadow, but no corresponding change occurred in wet meadow and marsh. The increase of SOC after grazing removal was attributed to increases in both labile (represented by LFOC) and non-labile (represented by HFOC) OC. Furthermore, the change of SOC is associated with TN both in light, heavy and dissolved fractions. Soil bulk density (BD) well explained the change of SOC after grazing exclusion, whereas the change of BD was mainly attributed to the change of heavy fraction. These results suggested that exclosure effects on SOC of rangeland were determined by ecosystem types. (C) 2014 Elsevier B.V. All rights reserved.