摘要： 田间试验表明，在冬小麦生长前期，根系对土壤水分的吸收主要集中在80cm以上的土层，随着根系向纵深方向的伸展，根系对深层土壤水分的利用逐步增大。影响根系对某一层次土壤水分利用的主要原因是该土层土壤中根量的大小、根系本身的吸水活力和土壤水分状况。在冬小麦生长后期，其上部土层中根系吸水活力出现下降。根系吸水在土壤中的分布可用活根的根长密度在土壤中的分布和根系吸水与土壤湿度有关的参数来描述。

关键词: 根系分布, 根系吸水, 土壤含水量, 冬小麦

Abstract: Results from field experiments showed that during the early growth period of winter wheat,root mainly extracted water from the top layer of soil,then along with the deepenning of root system,about half of the water was extracted from the soils under 80cm.The water uptake by root system from a layer of soil is affected by three main factors,which are the root quantity in that layer, root activity in uptaking water and soil water condition besides the potential transpiration rate.Based on the distribution of root in soil, the live root length and density and the relation of soil water content with.the root water extraction rate,a model was established to describe the distribution of root water uptake rate.

Key words: Root distribution, Root water uptake rate, Soil water content, Winter wheat

中图分类号: 

• S512.107