徐淮平原农田防护林系统土壤水分动态  

Dynamic changes in soil moisture content under farmland shelter belt system in Xuhuai Plain.

作　　者：王智[1] 薛建辉[2] 张金池[2] 

机构地区：[1]国家环境保护总局南京环境科学研究所 [2]南京林业大学森林环境与资源学院

出　　处：《农村生态环境》2003年第4期14-17,共4页Rural Eco-Environment

摘　　要：对小麦不同物候期农田防护林系统土壤含水量动态变化的测定结果表明:小麦不同物候期田间平均含水量的变化规律为幼苗期>返青期>拔节期>灌浆期,幼苗期和返青期杨树防护林对小麦的胁地影响不大,灌浆期是农田防护林与小麦争夺水分最为激烈的时期;幼龄防护林带能有效增加农田土壤含水量,对小麦生长有利,成熟林与农作物争夺水分的能力比幼龄林强,且对农作物的水分竞争主要集中在0.2倍树高范围内,造成此范围内土壤含水量明显不足。Investigations were carried out of dynamic changes in soil moisture content under the farmland shelter belt system in different phenological phases of wheat.The results demonstrated that the law of the change in mean soil water content of farmland in different phenological phases of wheat is seedling stage>regreening phase>jointing stage>milking stage;Shelter belts have little influence on wheat during the seedling stage and regreening stage,but drastically competition for water occurs between the shelter belts and the wheat during the milking stage;Young forests can effectively increase soil water content in farmland,which is favorable to the growth of wheat.In terms of ability of competing for moisture with crops,mature forests are stronger than young forests.The competition is concentrated within the range of 0.2 times of the height of the tree.

关 键 词：农田防护林 土壤含水量 物候期 动态变化 徐淮平原 

分 类 号：S727.24[农业科学—林木遗传育种] S152.7[农业科学—林学]