Subsurface irrigation with ceramic emitters: Evaluating soil water effects under multiple precipitation scenarios
Subsurface irrigation with ceramic emitters: Evaluating soil water effects under multiple precipitation scenarios
复制标题
使用陶瓷灌水器进行地下灌溉：评估多种降水情景下的土壤水效应
DOI：
10.1016/j.agwat.2022.107851
复制
发表时间：
2022-08-01
影响因子：
6.7
通讯作者：
Zhao，Xining
中科院分区：
文献类型：
--
作者：
Cai，Yaohui;Wu，Pute;Zhao，Xining
中国的黄土高原是世界上苹果树种植最优化、面积最大的地区。陶瓷灌水器地下灌溉（SICE）是干旱和半干旱地区果树的一种节能节水方法。气候变化正在改变年降水量，对现有的灌溉调度提出了挑战。然而，人们对年降水量变化如何影响 SICE 灌溉调度知之甚少。因此，采用HYDRUS-2D模拟和苹果园验证实验来研究事件和年尺度降水和陶瓷渗水器（CHC）导水率对土壤水动态的影响。结果表明，年降水对灌水量影响较小，但降水事件对灌水器流量影响显着；土壤中的流出量比空气中的流出量低 22.7% 和 49.7%，CHC 分别为 0.017 和 0.077 m d−1。 CHC与灌水量、渗滤深度呈显着正相关。降水和CHC均对苹果园土壤含水量有显着影响，2010年丰水年平均SWC比正常年和旱年偏高17.8%−24.7%，平均SWC分别为0.154和0.191 cm3cm−3，灌水器水力导率分别为0.017和0.077 m d−1。SICE可以提供不同降水年份苹果树土壤水环境稳定.苹果树可连续灌溉至7月，黄土高原地区7月后平均SWC超过0.20 cm3cm−3时可停止灌溉。这项工作可以帮助果园管理者通过 SICE 调整他们的果园，以满足未来气候变化条件下苹果的生长。
China's Loess Plateau is the optimal and largest region of growing apple trees in the world. Subsurface irrigation with ceramic emitters (SICE) is an energy-efficient and water-saving approach for fruit trees in arid and semi-arid regions. Climate change, which is shifting annual precipitation regimes, is challenging the existing irrigation scheduling. However, little is known about how annual precipitation change affect the irrigation scheduling with SICE. Therefore, simulations with HYDRUS-2D and validation experiments in apple orchard were used to study the effects of the event- and annual-scale precipitation and ceramic hydraulic conductivity of emitter (CHC) on soil water dynamics. Results indicated that annul precipitation slightly affected the irrigation volume, however precipitation events had a significant effect on emitter discharge; the outflow was 22.7% and 49.7% lower in soil than in air with CHC of 0.017 and 0.077 m d−1. There was a significant positive correlation among CHC, irrigation volume and deep percolation. Precipitation and CHC both have a significant effect on the soil water content in apple orchards, the average SWCs of wet year were 17.8%− 24.7% higher than normal and dry year, the average SWC was 0.154 and 0.191 cm3cm−3with emitter hydraulic conductivities of 0.017 and 0.077 m d−1, respectively, in 2010. SICE could provide a stable soil water environment for apple trees in different precipitation years. Apple trees could be continuously irrigated by SICE until July, and irrigation could be stopped when the average SWC exceeds 0.20 cm3cm−3after July in Loess Plateau. This work may assist orchard managers in adapting their orchards by SICE to meet apple growth under future climate change conditions.