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Stand transpiration and canopy conductance dynamics of Populus popularis under varying water availability in an arid area.
Du, Jiali; Dai, Xiaoqin; Huo, Zailin; Wang, Xingwang; Wang, Shuai; Wang, Chaozi; Zhang, Chenglong; Huang, Guanhua.
Afiliación
  • Du J; Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China.
  • Dai X; Qianyanzhou Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: daixq@igsnrr.ac.cn.
  • Huo Z; Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China. Electronic address: huozl@cau.edu.cn.
  • Wang X; Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China.
  • Wang S; Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China.
  • Wang C; Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China.
  • Zhang C; Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China.
  • Huang G; Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China.
Sci Total Environ ; 892: 164397, 2023 Sep 20.
Article en En | MEDLINE | ID: mdl-37247732
As a tree species of shelterbelts, Populus popularis maintains significant ecological functions in arid and semiarid areas. However, stand transpiration (T) and canopy conductance (gc) dynamics of P. popularis are unclear in arid irrigated areas with shallow groundwater fluctuations. To better understand the responses of T and gc to meteorological factors, soil water, and shallow groundwater in arid areas, we observed the environmental conditions and sap flow of P. popularis, and quantified T and gc in three growing seasons of 2018-2020 in a typical arid area of China. Results showed T and gc ranged from 0.18 to 6.11 mm day-1 and 2.26-12.54 mm s-1 in 2018-2020, respectively. Solar radiation and vapor pressure deficit (VPD) were major drivers of T at daily scales. It was consistently found that T exponentially decreased with increasing groundwater table depth (GTD) and decreasing reference evapotranspiration in three years. gc is primarily influenced by VPD and is positively related to soil water content in 0-30 cm soil layer (SWC0-30 cm). Moreover, low SWC0-30 cm and deepening GTD jointly decreased T and gc by 22.45 % and 30.41 %, respectively. The response of gc to VPD was susceptible to groundwater fluctuations, and the synergistic influences of VPD and GTD on gc could be well described by the logarithmic function, especially in 2019. The sensitivity of gc to VPD and its variations under different environmental conditions suggested that a flexible stomatal regulation of transpiration occurred in the observed P. popularis with the arid climate and shallow groundwater. These findings provided the essential basis for the water use strategy of P. popularis and stand water resources management in arid regions.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Agua / Populus Idioma: En Revista: Sci Total Environ Año: 2023 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Agua / Populus Idioma: En Revista: Sci Total Environ Año: 2023 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos