摘要
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范围内树根最为集中，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。树根二维分布可用二次多元非线性回归方程来描述。与杨树根系分布趋势相反，小麦根系则越靠近林带越少，且其根系密集区主要在0～20cm土层内，与杨树根系密集区位置上下错开。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。
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.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
1997年第1期109-116,共8页
Journal of China Agricultural University
关键词
农林复合系统
林带
根系分布特征
作物
composite system of agriculture and forestry
forest belt
distribution characteristic of the root system
