酸枣根系抗旱性研究

为研究酸枣根系的抗旱能力,采用了自行设计的伤流系数法测定根系活力,双环境法测定根系的提水作用。结果表明:酸枣深或广的根系分布、大的根/冠比和根形态学基端的"泵根",有利于根系吸收土壤中的有限水分,使其能够生存于水分短缺的环境条件下。对不同类型的酸枣来说,伤流系数越大,根系的生理活性越强,抗旱性也越强;酸枣根系具有提水作用,并且浅层土壤水分含量越低,根系提水作用越明显。生产上伤流系数和根系提水能力的强弱均可作为酸枣抗旱性鉴定的指标。

Study on drought resistance of the root for Ziziphus var. spinosa Hu

In order to study the drought resistance of root of Ziziphus var.spinosa Hu,the method of the coefficient of bleeding sap was used to measure the root vigor.The water uptake function was analyzed by the double environment method.Results showed that the root of Ziziphus var.spinosa Hu is wide,with high root-crown ratios,enabling it to absorb water from soil easily.For different types of Ziziphus var.spinosa Hu,the more coefficient of the bleeding sap,the more vigor of the root growth and drought resistance.The root of Zizyphus var.spinosa Hu is active in water uptake,and the less water in the upper soil layers,the more active the root in water uptake.The coefficient of bleeding sap and the water uptake performance can be used as the index for drought resistance of Ziziphus var.spinosa Hu.