Water use dynamics of trees in a Pinus tabuliformis plantation in semiarid sandy regions, Northeast China

文献类型： 外文期刊

第一作者： Song, Lining

作者： Song, Lining;Zhu, Jiaojun;Zheng, Xiao;Li, Xinjunyan;Zhang, Jinxin;Song, Lining;Zhu, Jiaojun;Zheng, Xiao;Li, Xinjunyan;Zhang, Jinxin;Song, Lining;Zhu, Jiaojun;Zheng, Xiao;Li, Xinjunyan;Zhang, Jinxin;Wang, Kai;Wang, Guochen;Sun, Haihong;Zhu, Jiaojun

作者机构：

关键词： J; E; Fern ?andez; Adaptation strategy; Plantation management; Sap flow; Nighttime tree water consumption; Transpiration

期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：6.611； 五年影响因子：6.574 ）

ISSN： 0378-3774

年卷期： 2023 年 275 卷

页码：

收录情况： SCI

摘要： Quantifying tree water use and its environmental controlling mechanisms are significantly important for un-derstanding of adaptation strategy of trees and plantation management in semiarid and arid regions. Here, tree water consumption and tree conductance of Chinese pine (Pinus tabuliformis) plantation were quantified using sap flow measurements. Environmental variables were measured concurrently during the growing seasons of 2019 and 2020. Results showed that daily, daytime and nighttime tree water consumption averaged 27.4, 24.7, and 2.7 kg d-1 across two years, respectively. Nighttime tree water consumption accounted for 10% of the daily's, which was mainly used for recharging stem water storage deficit caused by daytime transpiration to avoid hy-draulic failure. Daytime tree water consumption was more driven by solar radiation than by vapor pressure deficit. Moreover, daytime tree conductance was 0.9 mm s-1, and significantly decreased with increasing vapor pressure deficit and decreasing soil moisture, indicating that trees had strict stomatal regulation on tree tran-spiration. Scaling-up from tree to stand transpiration, daytime stand transpiration averaged 1.1 mm d-1 across two years, while accumulated stand transpiration was 112.8 mm and 126.8 mm in 2019 and 2020, respectively, accounting for 33% and 37% of precipitation. However, soil evaporation occupied 35% and 51% of precipitation in 2019 and 2020, respectively. This indicated that most of water in the plantation was consumed by soil evaporation. Difference between precipitation and sum of daytime stand transpiration, canopy interception, soil evaporation, and change in soil water storage was positive in two years, indicating that water budget was balanced. These findings indicated that Chinese pine trees had strict stomatal regulation on tree transpiration, and could recharge stem water storage deficit by nighttime sap flow. Moreover, stand transpiration occupied a small part of the water balance, and thus water supply was surplus, resulting in maintaining the stability of Chinese pine plantation.

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