四川盆地丘陵区坡地农林复合系统内部结构和系统综合效能的研究

针对四川盆地丘陵区农林生产特点和坡地农林复合系统特征，对其内部结构进行综合研究。分析了林带对农作物的正，负效应，依据林带间散射辐射分布规律、农地水土流失特征和农作物产量分布格局等方面与林带间距离的相互关系，提出了坡地林带间距离应不小于３倍林带平均高，才能保证农作物不至于减产；同时，对建成的坡地农林复合系统模式进行综合效能分析，表明，与农地系统对比，坡地农林复合系统提高了土地生产力、能量转化率、营养

STUDIES ON THE INTERNAL STRUCTURE AND THE SYNTHETICAL EFFICIENCIES OF AGROFORESTRY SYSTEM ON SLOPE IN THE HILLY REGION OF SICHUAN BASIN

According to the characteristics of forestry and agriculture and the feature of agroforestry system on slope in the hilly region of Sichuan Basin, the internal structure of agroforestry system was systematically studied, and the positive and negative effects of the forest belts to the crops were investigated. On the basis of analysing the distributing pattern of the scattering radiation, the feature of water and soil loss, the distributing pattern of the yield, and the distance between two forest belts on slope, the distance between two forest belts on slope which shoud be no less than three\|fold average height of forest belt has been provided in a position to guarantee against decreasing yield. Meanwhile, a contrastive analysis on the synthetical efficiencies of agroforestry system model and agriculture system was finished. The results showed that the productivity was improved, the energy transforming ratio, and the utilization efficiency of nutrient, value and labor force were also increased in agroforestry system on slope. It was provided with the more great producing potential.