Water Status Indices of Young Apple Tree Respond to Water Stress under the Environment Sheltered from Rain
文献类型： 外文期刊
作者： Sun Ying 1 ; Guan Qiuzhu 1 ; Nie Peixian 4 ; Jiang Yuanmao 1 ; Zhang Jinchun 1 ; Zhao Xiaoqi 1 ; Yang Jinduo; Zhang Ji 1 ;
作者机构： 1.Shandong Agr Univ, Coll Hort Sci & Engn, Natl Res Ctr Apple Engn & Technol, State Key Lab Crop Biol, Tai An 271018, Shandong, Peoples R China
2.Qingdao Agr Univ, Coll Sci & Informat, Qingdao 266109, Shandong, Peoples R China
3.Shandong Inst Pomol, Tai An 271000, Shandong, Peoples R China
4.Shandong Inst Pomol,
关键词： Apple trees; Water stress; Water status index; Maximum daily shrinkage; Midday stem water potential
期刊名称：INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY （ 影响因子：0.822； 五年影响因子：0.906 ）
ISSN： 1560-8530
年卷期： 2018 年 20 卷 5 期
页码：
收录情况： SCI
摘要： The main aim was to provide theoretical support for scientific regulation of the water and precision irrigation in orchards. This study focused on the water status indices of trees to soil water stress, and their relationship to water balance of the tree body. The results showed that stem maximum daily shrinkage (MDS) was the most sensitive to soil water stress, followed by midday stem water potential (psi(stem)). MDS also had obvious response to reference evapotranspiration (ET0, R = 0.6759, P < 0.01, N = 62). The psi(stem) was also sensitive to soil water stress and atmosphere water status, which was negatively correlated to ET0 (R = -0.47071, P < 0.05, N = 30). Relative MDSr and relative soil water potential (psi(rsoil)) was highly correlated (R = 0.6582, P < 0.01, N = 30); and correlation between relative midday stem potential (psi(rstem)) and psi(rsoil) was very significant (R = 0.6143, P < 0.01, N = 30). Moreover, MDS was measured in succession and recorded automatically, but so far it has been difficult automatically to measure either leaf or stem potential. The other tree water status indices like predawn water potential (psi(pd)), daily growth of stem diameter (DG), stomatal conductance (g(s)), had different response to water stress. But, in general, their response was not very sensitive to change in soil water potential. In conclusion, MDS is an optimal tool to aid for irrigation in orchards, followed by psi(stem). (C) 2018 Friends Science Publishers
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