The influence of drought strength on soil respiration in a woody savanna ecosystem, southwest China

CORC > 西双版纳热带植物园 > 中国科学院西双版纳热带植物园 > 全球变化研究组

	The influence of drought strength on soil respiration in a woody savanna ecosystem, southwest China
	Liu, Yuntong; Li, Jing; Jin, Yanqiang; Zhang, Yiping; Sha, Liqing; Grace, John; Song, Qinghai; Zhou, Wenjun; Chen, Aiguo; Li, Peiguang
刊名	PLANT AND SOIL
	2018
卷号	428 期号:43102 页码:321-333
关键词	Drought Savanna Soil Respiration Precipitation Exclusion Climate Change
ISSN号	0032-079X
英文摘要	Drought is expected to be more frequent and more intense with global warming. Our aim was to investigate how soil respiration would respond to different levels of precipitation exclusion ('drought strength'). We conducted a two-year drought experiment in a woody savanna ecosystem in south west of China, which consisted of four treatments: a control treatment (CK); 30% precipitation exclusion (PE3), 50% precipitation exclusion (PE5) and 70% precipitation exclusion (PE7). The cumulative soil respiration rates were significantly decreased in both rainy and dry seasons as drought became more intense. The sensitivity of soil respiration to soil moisture decreased as drought severity increased. There were bursts of CO2 emission when dry soils were rewetted by rainfall after the dry season. Unlike most other exponential relationships between soil respiration and soil temperature, a parabolic function was observed in all treatments (P < 0.05), which was due to higher soil temperature (> 28 A degrees C) coinciding with insufficient soil water content (< 11% Vol). Respiration rate is best represented by a model which combines soil moisture and temperature. Soil respiration rates were significantly decreased as drought enhanced. The response of soil respiration to drought in the dry season should not be ignored especially when evaluating the effect of drought on soil respiration in a whole year in savanna ecosystems. The quadratic relationship between soil respiration and soil temperature may be important for modeling the response of soil respiration to climate change (drought) in savanna ecosystems.
学科主题	Agriculture ; Plant Sciences
URL标识	查看原文
语种	英语
公开日期	2018-07-31
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/10979]
专题	西双版纳热带植物园_全球变化研究组
推荐引用方式 GB/T 7714	Liu, Yuntong,Li, Jing,Jin, Yanqiang,et al. The influence of drought strength on soil respiration in a woody savanna ecosystem, southwest China[J]. PLANT AND SOIL,2018,428(43102):321-333.
APA	Liu, Yuntong.,Li, Jing.,Jin, Yanqiang.,Zhang, Yiping.,Sha, Liqing.,...&Zhang, Shubin.(2018).The influence of drought strength on soil respiration in a woody savanna ecosystem, southwest China.PLANT AND SOIL,428(43102),321-333.
MLA	Liu, Yuntong,et al."The influence of drought strength on soil respiration in a woody savanna ecosystem, southwest China".PLANT AND SOIL 428.43102(2018):321-333.