Quantitative partitioning of temporal origin of transpiration into pre- and post-plantation under deep-rooted vegetation on the Loess Plateau of China
Quantitative partitioning of temporal origin of transpiration into pre- and post-plantation under deep-rooted vegetation on the Loess Plateau of China
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中国黄土高原深根植被种植前后蒸腾时间起源的定量划分
DOI：
10.1016/j.jhydrol.2022.128964
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发表时间：
2022-12
影响因子：
6.4
通讯作者：
Siddique Kadambot H.M.
中科院分区：
文献类型：
--
作者：
Chen Guangjie;Wu Wenjie;Meng Tingfang;Wen Mingyi;Si Bingcheng;He Jianqiang;Li Min;Dong Qin'ge;Feng Hao;Siddique Kadambot H.M.
在包气带中，不同年龄的深根植被蒸腾了大量的深层土壤水。然而，在整个植被寿命期间，新的蒸腾水（暂时源自种植后的降水）和旧的蒸腾水（暂时源自种植前的降水）之间的权衡知之甚少。在黄土高原28 m以上土层采集土壤样品，研究了深根植被对土壤水分年龄的影响，分析了草地、22年生苹果果园和17年生果园下包气带新老蒸腾水分的比例。水同位素（2 H，18 O，和3 H），溶质（氯化物，硝酸盐，硫酸盐），和土壤含水量被用来确定在非饱和带的临界水年龄（一年水年龄，水年龄对应的年龄，和最大水年龄的蒸腾），并确定土壤水分亏缺，土壤蒸发损失分数，和潜在的地下水补给。结果表明，土壤水分在土壤剖面中主要以活塞流的形式运移，深层土壤水主要来自强降水。深根植被抑制新孔隙水流速和潜在地下水补给。对于苹果和桃，新孔隙水速度分别从0.40 m yr− 1下降到0.14 m yr− 1和0.34 m yr− 1。与草地相比，深根植被使苹果和桃的地下水补给量分别减少了9.46%和7.04%。在整个植被生命周期内，苹果和桃的年平均蒸腾量分别为500.56 mm yr-1和468.89 mm yr-1，最大水龄分别为63年和45年。深根植被蒸腾主要利用新水，苹果94.97%，桃97.47%。苹果和桃的蒸腾耗水总量分别为553 mm和209 mm。我们的研究结果确定了植被水分利用的时间来源，提供了深根植被蒸腾过程的新见解。
Deep-rooted vegetation transpires a considerable amount of deep soil water with different ages in the unsaturated zone. However, the tradeoffs between new water of transpiration (temporally originating from post-planting precipitation) and old water of transpiration (temporally originating from pre-planting precipitation) across the vegetation lifespan are poorly understood. In this study, we collected soil samples from beyond 28 m soil depth on the Loess Plateau of China to investigate the influence of deep-rooted vegetation on the age of soil water and analyze the proportion of new and old water of transpiration in the unsaturated zone under grassland, 22-year-old apple orchard, and 17-year-old peach orchard. Water isotopes (2H,18O, and3H), solutes (chloride, nitrate, sulfate), and soil water content were used to identify the critical water ages in the unsaturated zone (one-year water age, water age corresponding to stand age, and the maximum water age of transpiration), and to determine soil water deficit, soil evaporation loss fraction, and potential groundwater recharge. The results showed that soil water mainly moved as piston flow in these soil profiles, and deep soil water largely came from heavy precipitation. Deep-rooted vegetation restrained new pore water velocity and potential groundwater recharge. New pore water velocity declined from 0.40 m yr−1to 0.14 m yr−1and 0.34 m yr−1for apple and peach, respectively. Deep-rooted vegetation decreased groundwater recharge by 9.46 % for apple and 7.04 % for peach, compared to grassland. Over the vegetation lifespan, annual average transpiration was 500.56 mm yr−1and 468.89 mm yr−1with maximum water age of 63 years and 45 years for apple and peach, respectively. The transpiration of deep-rooted vegetation mainly used new water—94.97 % for apple and 97.47 % for peach. The total old water of transpiration was 553 mm for apple and 209 mm for peach. Our results identify the temporal sources of vegetation water use, offering new insights into the transpiration process of deep-rooted vegetation.
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影响因子：
6.4
作者：
Zhi Li;S. Jasechko;B. Si
通讯作者：
Zhi Li;S. Jasechko;B. Si
影响因子：
5.4
作者：
T. Turkeltaub;X. Jia;Yuanjun Zhu;M. Shao;A. Binley
通讯作者：
T. Turkeltaub;X. Jia;Yuanjun Zhu;M. Shao;A. Binley
DOI：
10.1016/j.ejrh.2021.100840
发表时间：
2021-08
期刊：
Journal of Hydrology: Regional Studies
影响因子：
--
作者：
Tao Ze;Li Hongchen;Neil Eric;Si Bingcheng
通讯作者：
Si Bingcheng
影响因子：
5.4
作者：
Benettin, Paolo;Nehemy, Magali F.;Rinaldo, Andrea
通讯作者：
Rinaldo, Andrea
影响因子：
6.4
作者：
R. Lin;K. Wei
通讯作者：
R. Lin;K. Wei