The effect of water table decline on soil CO2 emission of Zoige peatland on eastern Tibetan Plateau: A four-year in situ experimental drainage

doi:10.1016/j.apsoil.2017.07.036

	The effect of water table decline on soil CO2 emission of Zoige peatland on eastern Tibetan Plateau: A four-year in situ experimental drainage
	Cao, R; Xi, XQ; Yang, YHS; Wei, X; Wu, XW; Sun, SC; Wu, XW (reprint author), Nanjing Univ, Coll Life Sci, Dept Ecol, 163 Xianlin Ave, Nanjing 210093, Jiangsu, Peoples R China.
刊名	APPLIED SOIL ECOLOGY
	2017
卷号	120 页码:55-61
关键词	Anthropogenic Environmental Change Carbon Cycling Climate Change Qinghai-tibet Plateau Water Table
DOI	10.1016/j.apsoil.2017.07.036
产权排序	2
文献子类	Article
英文摘要	Water table decline is a major threat to soil organic carbon in peatlands worldwide principally because it may largely increase soil CO2 emission (SCE). This study is to determine the response of SCE to water table decline in the Zoige peatland of Tibetan Plateau, which has experienced rapid decline of water table due to climate change and anthropogenic drainage. We conducted a field in situ drainage experiment consisting of low (plots surrounded by 50 cm deep ditches), intermediate (20 cm deep) and high (intact) water table levels. The experiment lasted for about four years, during which we measured SCE rate and associated variables including soil temperature and moisture with a higher frequency in the growing season (May-September) than the non-growing season (October-April). Experimental drainage decreased water table height by ca. 12 cm and 15 cm (relative to the intact) and soil moisture (at 5 cm soil) by 6% and 12% (relative to 45% in the intact) on average in intermediate and low water table treatments, respectively, but it did not affect soil temperature during the experimental years. The effect of drainage on SCE varied with season. In the non-growing season, the drainage effect was nonsignificant in each measurement possibly because the low-temperature effect overrode the drainage effect on SCE. In the growing season, the drainage mostly increased the emission except for several cases, in which a negative effect was observed. The negative effect of drainage could be due to the low soil moisture (< 25%) in the drained treatments. Provided that the magnitude and the duration of the SCE increase were greater than those of the decrease, it can be estimated that drainage increased SCE by 17% and 20% on average in the low and the intermediate water table treatments, respectively, over the experimental years. Our results suggest that water table decline may facilitate net carbon emission and hence decrease soil carbon storage in the Zoige peatland. We call for artificial filling of the ditches that were historically created by both human beings and storm waters to increase water table in the Zoige peatland.
学科主题	Agriculture
语种	英语
资助机构	We thank Xiaoli Hu, Yuran Dong, Zhuomiao Hu, Xintong Zhong, Kai He and Guidan Zhao for their field assistance and Qinghai-Tibetan Research Base of Southwest University for Nationalities for providing research facilities. This study was financially supported by grants from National Natural Science Foundation of China (31325004, 31530007 and 31470482) and 973 Program (2013CB956302). ; National Natural Science Foundation of China [31325004, 31530007, 31470482] ; We thank Xiaoli Hu, Yuran Dong, Zhuomiao Hu, Xintong Zhong, Kai He and Guidan Zhao for their field assistance and Qinghai-Tibetan Research Base of Southwest University for Nationalities for providing research facilities. This study was financially supported by grants from National Natural Science Foundation of China (31325004, 31530007 and 31470482) and 973 Program (2013CB956302). ; National Natural Science Foundation of China [31325004, 31530007, 31470482] ; 973 Program [2013CB956302] ; 973 Program [2013CB956302] ; We thank Xiaoli Hu, Yuran Dong, Zhuomiao Hu, Xintong Zhong, Kai He and Guidan Zhao for their field assistance and Qinghai-Tibetan Research Base of Southwest University for Nationalities for providing research facilities. This study was financially supported by grants from National Natural Science Foundation of China (31325004, 31530007 and 31470482) and 973 Program (2013CB956302). ; National Natural Science Foundation of China [31325004, 31530007, 31470482] ; We thank Xiaoli Hu, Yuran Dong, Zhuomiao Hu, Xintong Zhong, Kai He and Guidan Zhao for their field assistance and Qinghai-Tibetan Research Base of Southwest University for Nationalities for providing research facilities. This study was financially supported by grants from National Natural Science Foundation of China (31325004, 31530007 and 31470482) and 973 Program (2013CB956302). ; National Natural Science Foundation of China [31325004, 31530007, 31470482] ; 973 Program [2013CB956302] ; 973 Program [2013CB956302]
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/29094]
专题	成都生物研究所_生态研究
通讯作者	Wu, XW (reprint author), Nanjing Univ, Coll Life Sci, Dept Ecol, 163 Xianlin Ave, Nanjing 210093, Jiangsu, Peoples R China.
推荐引用方式 GB/T 7714	Cao, R,Xi, XQ,Yang, YHS,et al. The effect of water table decline on soil CO2 emission of Zoige peatland on eastern Tibetan Plateau: A four-year in situ experimental drainage[J]. APPLIED SOIL ECOLOGY,2017,120:55-61.
APA	Cao, R.,Xi, XQ.,Yang, YHS.,Wei, X.,Wu, XW.,...&Wu, XW .(2017).The effect of water table decline on soil CO2 emission of Zoige peatland on eastern Tibetan Plateau: A four-year in situ experimental drainage.APPLIED SOIL ECOLOGY,120,55-61.
MLA	Cao, R,et al."The effect of water table decline on soil CO2 emission of Zoige peatland on eastern Tibetan Plateau: A four-year in situ experimental drainage".APPLIED SOIL ECOLOGY 120(2017):55-61.