Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10021-019-00379-5 |
Different Effects of Spring and Summer Droughts on Ecosystem Carbon and Water Exchanges in a Semiarid Shrubland Ecosystem in Northwest China | |
Liu, Peng1,2,3; Zha, Tianshan1,2; Jia, Xin1,2; Black, T. Andrew3; Jassal, Rachhpal S.3; Ma, Jingyong1,2; Bai, Yujie1,2; Wu, Yajuan1,2 | |
通讯作者 | Zha, Tianshan |
来源期刊 | ECOSYSTEMS
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ISSN | 1432-9840 |
EISSN | 1435-0629 |
出版年 | 2019 |
卷号 | 22期号:8页码:1869-1885 |
英文摘要 | Extensive revegetation and conservation programs have been initiated in semiarid desert areas in northern China for over 10 years. However, our knowledge on how drought affects the desert ecosystem carbon (C) and water exchanges is limited. Based on eddy covariance measurements, we evaluated the effect of spring and summer droughts on ecosystem C and water exchanges over a semiarid Artemisia ordosica shrubland in Northwest China for 2014-2016. Over the 3 years, the ecosystem was a weak source of C (40 +/- 32 g C m(-2) y(-1)) (mean +/- standard deviation) with evapotranspiration (ET) of 310 +/- 65 mm y(-1). Annual net ecosystem production was - 76, - 25 and - 18 g C m(-2) y(-1) and water use efficiency (WUE) [gross ecosystem production (GEP)/ET] was 0.92, 1.14 and 1.09 g C kg(-1) H2O in 2014, 2015 and 2016, respectively, indicating greater C loss and suppressed WUE in 2014. We found that GEP, Re and ET were significantly suppressed in year 2014 when a severe spring drought occurred, as compared to the year 2016 with summer droughts. The differences in C and water fluxes between years 2014 and 2016 were greater than those between years 2015 and 2016, although the ecosystem suffered a severe summer drought in 2015. Interannual differences in GEP were likely due to differences in leaf area index and canopy conductance, both of which were decreased by drought. Our results indicated that spring drought appears to be more critical to the C balance than summer drought in this semiarid shrubland. This suggested that under future climate change with more variable precipitation and frequent droughts expected in northern China, the timing of drought may be critical to the C and water balances. |
英文关键词 | drought carbon flux water use efficiency gross ecosystem production net ecosystem production ecosystem respiration |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China ; Canada |
收录类别 | SCI-E |
WOS记录号 | WOS:000508406000012 |
WOS关键词 | GROSS PRIMARY PRODUCTION ; PRIMARY PRODUCTIVITY ; CO2 EXCHANGE ; RESPIRATION ; PRECIPITATION ; BALANCE ; FLUXES ; FOREST ; SENSITIVITY ; EVENTS |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
EI主题词 | 2019-12-01 |
来源机构 | 北京林业大学 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/311133 |
作者单位 | 1.Beijing Forestry Univ, Sch Soil & Water Conservat, Yanchi Res Stn, 35 East Qinghua Rd, Beijing 100083, Peoples R China; 2.Beijing Forestry Univ, Key Lab State Forestry Adm Soil & Water Conservat, Beijing 100083, Peoples R China; 3.Univ British Columbia, Biometeorol & Soil Phys Grp, 2357 Main Mall, Vancouver, BC V6T 1Z4, Canada |
推荐引用方式 GB/T 7714 | Liu, Peng,Zha, Tianshan,Jia, Xin,et al. Different Effects of Spring and Summer Droughts on Ecosystem Carbon and Water Exchanges in a Semiarid Shrubland Ecosystem in Northwest China[J]. 北京林业大学,2019,22(8):1869-1885. |
APA | Liu, Peng.,Zha, Tianshan.,Jia, Xin.,Black, T. Andrew.,Jassal, Rachhpal S..,...&Wu, Yajuan.(2019).Different Effects of Spring and Summer Droughts on Ecosystem Carbon and Water Exchanges in a Semiarid Shrubland Ecosystem in Northwest China.ECOSYSTEMS,22(8),1869-1885. |
MLA | Liu, Peng,et al."Different Effects of Spring and Summer Droughts on Ecosystem Carbon and Water Exchanges in a Semiarid Shrubland Ecosystem in Northwest China".ECOSYSTEMS 22.8(2019):1869-1885. |
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