气候变化领域集成服务门户(CCPortal): Climate change affects soil labile organic carbon fractions in a Tibetan alpine meadow

CCPortal

DOI	10.1007/s11368-016-1565-4
	Climate change affects soil labile organic carbon fractions in a Tibetan alpine meadow
	Hu, Yigang; Wang, Zengru; Wang, Qi; Wang, Shiping; Zhang, Zhishan; Zhang, Zhenhua; Zhao, Yang
通讯作者	Hu, YG (通讯作者)
发表日期	2017
ISSN	1439-0108
EISSN	1614-7480
起始页码	326
结束页码	339
卷号	17 期号:2
英文摘要	Changes in bioactive soil C pools and their temperature sensitivities will dominate the fate of soil organic C in a warmer future, which is not well understood in highland ecosystems. This study was conducted in order to evaluate climate change, especially cooling effects, on soil labile organic C (LOC) pools in a Tibetan alpine meadow. A short-term reciprocal translocation experiment was implemented to stimulate climate warming (downward translocation) and cooling (upward translocation) using an elevation gradient on the Tibetan Plateau. Variations in soil microbial biomass C (MBC), dissolved organic C (DOC) and LOC were analyzed. Over the range of soil temperature from 0.02 to 5.5 A degrees C, warming averagely increased soil MBC, DOC and LOC by 15.3, 17.0 and 3.7 % while cooling decreased them by 11.0, 11.9 and 3.2 %, respectively. Moreover, warming generally increased the proportion of DOC in LOC but cooling had an opposite effect, while the response of the MBC proportion to DOC and LOC varied depending on vegetation type. Soil MBC, DOC and LOC pools were positively related to soil temperature and showed a hump-shaped relationship with soil moisture with a threshold of about 30-35 %. Although soil DOC was more sensitive to warming (5.1 % A degrees C-1) than to cooling (3.0 % A degrees C-1), soil LOC showed a symmetrical response due to regulation by soil moisture. Our results indicated that climate change would not only change the size of soil LOC pools but also their quality. Therefore, cooling effects and regulation of soil moisture should be considered to evaluate the fate of soil organic C in Tibetan alpine meadows in a warmer future.
关键词	TEMPERATURE SENSITIVITY RECIPROCAL TRANSLOCATION TURNOVER NITROGEN MATTER RESPIRATION AVAILABILITY DYNAMICS DOC DECOMPOSITION
英文关键词	Alpine meadow; Climate change; Reciprocal translocation; Soil labile organic C
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
WOS类目	Environmental Sciences ; Soil Science
WOS记录号	WOS:000389912200004
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258984
推荐引用方式 GB/T 7714	Hu, Yigang,Wang, Zengru,Wang, Qi,et al. Climate change affects soil labile organic carbon fractions in a Tibetan alpine meadow[J]. 中国科学院青藏高原研究所,2017,17(2).
APA	Hu, Yigang.,Wang, Zengru.,Wang, Qi.,Wang, Shiping.,Zhang, Zhishan.,...&Zhao, Yang.(2017).Climate change affects soil labile organic carbon fractions in a Tibetan alpine meadow.JOURNAL OF SOILS AND SEDIMENTS,17(2).
MLA	Hu, Yigang,et al."Climate change affects soil labile organic carbon fractions in a Tibetan alpine meadow".JOURNAL OF SOILS AND SEDIMENTS 17.2(2017).