关键词: 农林复合经营, 核桃, 培肥效果, 大渡河干热河谷区

Abstract: 【Objective】 The selection of optimum compound planting models under walnut plantation plays an important role in the development of economy under walnut plantation. 【Method】 Soil physical properties, nutrient content, microbe number and enzyme activity of the surface soil (0-20 cm) of each model were determined under different compound planting models (including：walnut+cabbage+cabbage (HGG), walnut+cabbage+potato (HGM), walnut+Chinese cabbage+soybean (HBD), walnut control (HCK)) and farmland control (NCK), and used the membership function method to evaluate the soil fertility of each models. 【Result】 Compared with the CK, soil bulk density decreased by 4.6%-17.6%, non-capillary porosity, capillary porosity and total porosity increased by 2.4%-14.8%, 2.8%-29.1% and 2.6%-23.1%, respectively;organic C, total N, hydrolysis N, total P and total K content increased by 5.1%-14.9%, 3.9%-12.5%, 25.1%-112.5%, 11.4%-47.1% and 0.2%-2.7%, respectively;the available P content of the HGG and HGM increased by 21.9% and 5.0%, while the other models decreased by 6.1%-28.3%, respectively, the available K content of the HCK decreased by 17.4%, while the other models increased by 20.4%-52.9%;the number of soil bacteria, actinomycetes, fungus and total microbe increased by 21.4%-54.3%, 19.2%-58.1%, 17.8%-58.4% and 21.2%-54.6%, respectively;invertase, urease, phosphatase, catalase, polyphenol oxidase and peroxidase activity increased by 9.3%-57.8%, 16.6%-56.7%, 6.2%-30.8%, 8.9%-41.1%, 4.2%-14.3% and 1.4%-38.6%, respectively;the comprehensive value of soil fertility of each model increased by 69.6%-431.3%. 【Conclusion】 All the compound planting models under walnut plantation have obvious improving effect to soil fertility, and the HGG was the optimum model, which is important for the development of under-forest economy and soil fertility improvement in research area.

Key words: compound planting, walnut, fertilizer effect, dry-hot valley of Dadu River