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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; Zhang, Shubin
2018
Source PublicationPLANT AND SOIL
ISSN0032-079X
Volume428Issue:43102Pages:321-333
AbstractDrought 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.
Department其他
KeywordDrought Savanna Soil Respiration Precipitation Exclusion Climate Change
Subject AreaAgriculture ; Plant Sciences
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10979
Collection全球变化研究组
Recommended Citation
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.
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