对黄淮海平原地区常见间作形式之一的农桐间作3年生泡桐进行覆膜与挖沟2种根系处理，利用土柱法对间作地块0～20 cm与20～40 cm土层内植物根系的长度与现存量、土壤含水率进行测定，还对植物地上部分的现存量进行测定。结果表明，间作地块内的植物根系生长受到一定程度的胁地影响，植物地上部分现存量受胁地影响较为明显，土壤含水率受降雨影响较大；胁地影响范围大致为树高的0.7倍，但根系受影响的范围可达到林带中心位置；采取切根处理措施后，胁地影响的主要因素为树冠，2种根系处理技术对植物根系及其地上部分生物的影响差异不显著。%Paulownia intercropping is a common agroforestry form in the Huang-Huai-Hai Plain.In the paper, selected 3-year Paulownia intercropping field as research plot,and applied plastic film covering and trenching method to treat root,and then measured the length and existing biomass of plant root,soil moisture content in 0-20 cm and 20-40 cm layers using soil column method.Also,we measured plant standing crop of aboveground by using harvest method.The results showed that:in a certain degree,the plant root growth was affected by intercrop-ping.The effect on aboveground biomass was more obviously.The soil moisture was mainly influenced by precipita-tion.The distance of trees′negative effect was approximately 0.7 times of tree height,while for plant root;the effect could be reached to the center of the intercropping field.When the shelterbelt tree was treated by root cut-ting,the main factor of its negative effect was from tree′s crown;there was no significant difference between on root growth and aboveground biomass under 2 root treatments.
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