Applying hydraulic lift in an agroecosystem: forage plants with shoots removed supply water to neighboring vegetable crops
Applying hydraulic lift in an agroecosystem: forage plants with shoots removed supply water to neighboring vegetable crops
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DOI：
10.1007/s11104-010-0581-1
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发表时间：
2011-04
期刊：
影响因子：
4.9
通讯作者：
Nobuhito Sekiya;H. Araki;K. Yano
中科院分区：
文献类型：
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作者：
Nobuhito Sekiya;H. Araki;K. Yano
当植物在其根系内遇到空间异质的土壤水分时，通常是干燥的表面和潮湿的地下土壤，水可以通过根系在这些层之间移动，这是一种被称为水力提升或再分配的植物过程。这样转移的水不仅可供植物本身使用，也可供其邻居使用。我们研究了这一过程作为一种可能的生物灌溉工具的应用。作为“供体”，我们使用多年生饲料植物与他们的芽删除，以尽量减少光的影响，他们对“接收器”植物生长在他们旁边。在水平分根实验中，上层容器装满沙子，下层容器装满水，上级供体物种可以保持上层沙子在完全水合的条件下几个星期，增加气孔导度的接收器。在水有限的农业领域的影响也得到了证实，在冠层温度和产量显着差异，在相邻的作物植物在存在或不存在供体根系。这些结果表明，深根植物与他们的芽删除功能作为一种灌溉工具，提高作物产量在缺水的环境。
When a plant encounters spatially heterogeneous soil moisture within its root system, usually drier surface and moister subsurface soils, water can move between these layers through the root system, a plant process known as hydraulic lift or redistribution. The water thus transferred is available not only for the plant itself but also for its neighbors. We examined application of this process as a possible biological irrigation tool. As ‘donors’, we used perennial forage plants with their shoots removed to minimize the effect of light-interception by them on the ‘receiver’ plants growing alongside them. In a horizontally split-root experiment, where an upper container was filled with sand and a lower one with water, superior donor species could maintain the upper sand in a fully hydrated condition for several weeks, increasing stomatal conductance in the receivers. The effects were also confirmed in a water-limited agricultural field, as significant differences were found in canopy temperature and yield in neighboring crop plants in the presence or absence of donor root systems. These results suggest that deep-rooting associate plants with their shoots removed function as an irrigation tool and improve crop production in water-scarce environments.