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Water stress controls on carbon flux and water use efficiency in a warm-temperate mixed plantation
Tong, Xiaojuan1; Mu, Yanmei1; Zhang, Jinsong2; Meng, Ping2; Li, Jun3
2019-04-01
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
Volume571Pages:669-678
Corresponding AuthorTong, Xiaojuan(tongxj@bjfu.edu.cn) ; Zhang, Jinsong(zhangjs@caf.ac.cn)
AbstractWater stress can cause the structural and physiological changes of plants to prevent excessive water loss according to species-specific water use strategies. CO2 and water vapor fluxes were measured by the eddy covariance in a mixed plantation during a 4-year period. The potential evapotranspiration (PET) was obtained by the Shuttleworth-Wallace model. Evapotranspiration (ET) versus PET was used to determine the plant water stress index (PWSI). The objective of this study is to quantify the effect of PWSI on net ecosystem productivity (NEP), gross primary productivity (GPP) and water use efficiency (WUE). The relationship between PWSI and soil water content in sunny and cloudy skies was examined. Mean seasonal PWSI values varied substantially among years. The average annual value of PWSI was 0.49 +/- 0.07. PWSI was strongly correlated with vapor pressure deficit, illustrating that the moisture limitation through high evaporative demand was more remarkable than water supply limitation. Water stress can substantially reduce canopy conductance and leaf area index, and hence decreasing photosynthesis. Water stress suppressed GPP while having little influence on ecosystem respiration, resulting in the increase of net carbon uptake. NEP decreased as a reaction to water stress when PWSI was more than 0.4, whereas WUE was enhanced under moderate and severe water stress (PWSI > 0.6). Compared to NEP, the difference of ET between cloudy and sunny sky conditions was more evident at the same PWSI value. Therefore, cloudy sky conditions were beneficial to enhancing WUE. Water stress restricted the mixed plantation in the period of spring-early summer. At the annual scale, the mixed plantation was exposed to moderate water stress. The PWSI approach is a promising tool quantifying water stress in forest ecosystems.
KeywordPlant water stress index Net ecosystem productivity Gross primary productivity Evapotranspiration Water use efficiency
DOI10.1016/j.jhydrol.2019.02.014
WOS KeywordRADIATION-USE EFFICIENCY ; NET ECOSYSTEM EXCHANGE ; DEFICIT IRRIGATION ; DROUGHT STRESS ; PHYSIOLOGICAL-RESPONSES ; CANOPY TEMPERATURE ; STOMATAL APERTURE ; TUBER YIELD ; INDEX ; CLIMATE
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[31570617] ; National Natural Science Foundation of China[31872703] ; Fundamental Research Funds for the Central Universities[YX2011-19]
Funding OrganizationNational Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities
WOS Research AreaEngineering ; Geology ; Water Resources
WOS SubjectEngineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000462692100056
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/48576
Collection中国科学院地理科学与资源研究所
Corresponding AuthorTong, Xiaojuan; Zhang, Jinsong
Affiliation1.Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China
2.Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Beijing 100091, Peoples R China
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Tong, Xiaojuan,Mu, Yanmei,Zhang, Jinsong,et al. Water stress controls on carbon flux and water use efficiency in a warm-temperate mixed plantation[J]. JOURNAL OF HYDROLOGY,2019,571:669-678.
APA Tong, Xiaojuan,Mu, Yanmei,Zhang, Jinsong,Meng, Ping,&Li, Jun.(2019).Water stress controls on carbon flux and water use efficiency in a warm-temperate mixed plantation.JOURNAL OF HYDROLOGY,571,669-678.
MLA Tong, Xiaojuan,et al."Water stress controls on carbon flux and water use efficiency in a warm-temperate mixed plantation".JOURNAL OF HYDROLOGY 571(2019):669-678.
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