农林复合系统中林带和作物的根系分布特征

本文从农林复合系统角度探讨了杨树林带和小麦根系分布特征。结果认为：林带根系分布水平伸展至１．５Ｈ（Ｈ为树高）范围内，尤以０．５Ｈ范围内树根量为集中，并且９０％以上，根系集中于０－１００ｃｍ土层内，其中２０－６０ｃｍ土层为根系密集区。讨论了土壤水分状况、林带遮荫与根系分布的关系以及林带附近的作 物生产效能。

Distribution Charateristic of the Root System of Forest Belt and Crop Within the Composite System of Agriculture and Forestry

Proceeded from the conposite system of agriculture and forestry, this article discussed the distribution characteristic of the root system of the poplar forest belt and winter wheat. The results indicated that, the horizontal distribution of root system of for-est belt streteched to the range of 1. 5H (H meant tree height),especially within the range of 0. 5H the root system of trees was the most f and that the root system above 90% was distributed within the soil layer of 0~100 cm, in the range of 20~60 cm the distribution of the root system was the most dense. The distribution of two dimensions of root system could be showed by double multiple unlinear regression equation. As opposed to the trend of the disitribution of root systen of Poplar, the nearer the root system of winter wheat to the forest belt is, the less the root system will be, and that the dense range of root system is mainly situated in the soil layer of 0~20 cm, its place and the place of the dense range of root system of poplar were staggered up and down. This article discussed also the rela-tions between the state of the soil moisture, the sunshade of forest belt and the distribu-tion of root system. At last this article analysed briefly the crop production efficiency near the forest belt of polar.