Soil Water Content and Root Patterns in a Rain-fed Jujube Plantation across Stand Ages on the Loess Plateau of China
Soil Water Content and Root Patterns in a Rain-fed Jujube Plantation across Stand Ages on the Loess Plateau of China
复制标题
黄土高原不同林龄雨养枣园土壤含水量及根系格局
DOI：
10.1002/ldr.2540
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发表时间：
2017-01-01
影响因子：
4.7
通讯作者：
Sun, Wenhao
中科院分区：
文献类型：
--
作者：
Li, Lusheng;Gao, Xiaodong;Sun, Wenhao
种植经济林木是1999年启动的黄土高原大规模生态修复工程（绿色工程）的主要内容之一。土壤水分动态和细根模式的知识是至关重要的果园在这一地区的水分管理。研究了黄土高原雨养枣树种植园不同林龄（2、6、10、15年）根区土壤水分变化和细根分布特征。使用便携式时域反射仪监测0至3米深度的土壤水分，并使用手动螺旋钻（φ = 9厘米）采集根系样品。结果表明，降雨后，林分0 ~ 06 m土层土壤贮水量显著增加。而06 m以下的土壤贮水量在整个生长季内变化不明显。细根长度密度总体上随林龄的增加而增加，幼龄林（2年生和6年生）的细根长度密度在树干周围的垂直和水平方向上分布不均匀，成熟林（10年生和15年生）的细根长度密度从树干径向均匀分布。此外，在成熟林分中，细根密度高的区域位于行间，幼林细根比长大于成熟林。研究结果可为黄土高原雨养枣园水分管理提供参考，也可为其他半干旱地区枣园水分管理提供借鉴。版权所有（c）2016约翰威利父子有限公司
Planting economic trees is one of the primary parts of the large-scale ecological rehabilitation project (known as Grain for Green' project) initiated in 1999 on the Loess Plateau of China. Knowledge of soil water dynamics and fine roots patterns is critical to water management for orchards in this region. Here we investigated the distribution of root-zone soil water variation and fine roots with a range of stand ages (2, 6, 10 and 15years) in a rain-fed jujube (Ziziphus jujuba) plantation on the Loess Plateau. Soil water in the 0- to 3-m depth was monitored using portable Time Domain Reflectometry, and root samples were taken with a hand auger (phi=9cm). The results showed soil water storage in the 0- to 06-m soil layers in all stands increased remarkably following apparent rainfall events. However, there was no clear change in soil water storage below 06m throughout the growing season. Generally, fine root length density increased with the increase of stand age, which were unevenly distributed in the vertical and horizontal directions around the tree trunks in young stands (2 and 6years), and the fine roots were uniformly distributed radically from the tree trunk in mature stands (10 and 15years). Additionally, a high-density zone of fine roots was observed in the middle of the inter-row in mature stands, and the specific length of fine roots in young stands was higher than observed in mature stands. The results presented here would be helpful to water management in the rain-fed jujube plantations on Loess Plateau and potentially for other semi-arid orchards. Copyright (c) 2016 John Wiley & Sons, Ltd.