低丘红壤南酸枣与花生复合系统种间水肥光竞争的研究——Ⅲ.南酸枣与花生利用水分状况分析

Competition of absorbing water,fertilizer and light between Choerospondias axillaries trees and peanut in the red soil of low hilly land-The water use conditions of Choerospondias axillaries trees and peanut

试验研究结果表明农林复合系统南酸枣与花生利用土壤水分既协同又竞争,二者根系分布空间有差异,南酸枣根系可从深层湿润土壤中吸收水分,再通过根系提水作用,使水分运移至上层释放,被邻近花生残根所吸收利用.复合区比单作区入渗水多,植物蒸腾减缓,树木遮荫降温,均有利于复合系统自身土壤水分协调平衡.二者水分竞争主要表现在7～10月份干旱季节,但上层土壤水吸力差值较小,表明种间吸水竞争不甚明显,复合系统造成的种间水竞争负面影响不是抑制花生生育的主要障碍因子.

Choerospondias axillaries trees and peanut of agroforestry in the red soil of low hilly land utilize soil water either in cooperation or in competition. Choerospondias axillaries trees can absorb water from moisture soil at deep horizon and lift water to the surface of soil for peanut using the roots of trees distributed deeply. Competition of the water between Choerospondias axillaries trees and peanut only takes place in dry season（ from July to October）and the competition is not obvious. So the water competition of Choerospondias axillaries trees and peanut of agroforestry is not the main obstacle factor affecting peanut growth.