Environmental and canopy stomatal control on ecosystem water use efficiency in a riparian poplar plantation
Environmental and canopy stomatal control on ecosystem water use efficiency in a riparian poplar plantation
复制标题
河岸杨人工林生态系统水分利用效率的环境和冠层气孔控制
DOI:
10.1016/j.agrformet.2020.107953
复制
发表时间:
2020-06
影响因子:
6.2
通讯作者:
Zuosinan Chen
中科院分区:
文献类型:
--
作者:
Hang Xu;Zhiqiang Zhang;Jingfeng Xiao;Jiquan Chen;Mengxun Zhu;Wenxu Cao;Zuosinan Chen
Ecosystem water use efficiency (EWUE), defined as the ratio of ecosystem gross primary production (GPP) and evapotranspiration (ET), is regulated by multiple biophysical factors and their interactions. One particular unknown is the relative importance of environmental control and canopy stomatal control onEWUEfor their direct and indirect roles in different seasons. We employed the eddy covariance technique and micrometeorological sensors to measure the carbon and water fluxes and environmental variables over a riparian poplar plantation in northern China from 2014 to 2017. We found that canopy conductance (Gc) was the dominant factor regulatingEWUEin spring and autumn, while the fraction of diffuse radiation (FDR) was the primary controlling variable in summer. During the growing season,FDRdepressedETand promotedGPPprimarily through its direct role rather than indirectly affecting other environmental factors. This plantation could utilize diffuse radiation efficiently by regulating stomatal function whenFDRwas lower than 0.6. More importantly, the stomatal optimization theory worked merely under certain conditions (i.e.,VPD≤ 3 kPa). Correspondingly, the poplar plantation tended to show less conservative water use strategy with decreasing surface soil water content (SWC) when the non-stomatal function was dominant. Our study highlighted the importance ofFDRandGconEWUEand the potential of future water resource impact resulting from extensive poplar plantation establishment in northern China.
登录
查看更多内容
影响因子:
4.8
作者:
Yi Fan;Jiquan Chen;Gabriela Shirkey;R. John;S. Wu;Hogeun Park;C. Shao
通讯作者:
Yi Fan;Jiquan Chen;Gabriela Shirkey;R. John;S. Wu;Hogeun Park;C. Shao
影响因子:
2.2
作者:
Hang Xu;Zhiqiang Zhang;Jiquan Chen;Mengxun Zhu;Manchun Kang
通讯作者:
Hang Xu;Zhiqiang Zhang;Jiquan Chen;Mengxun Zhu;Manchun Kang
影响因子:
6.4
作者:
GRIEU, P;GUEHL, JM;AUSSENAC, G
通讯作者:
AUSSENAC, G
影响因子:
6.2
作者:
Launiainen, Samuli;Katul, Gabriel G.;Hari, Pertti
通讯作者:
Hari, Pertti
影响因子:
5.2
作者:
G. Wohlfahrt;A. Hammerle;Alois Haslwanter;M. Bahn;U. Tappeiner;A. Cernusca
通讯作者:
G. Wohlfahrt;A. Hammerle;Alois Haslwanter;M. Bahn;U. Tappeiner;A. Cernusca