Abstract: Sloping wildland is the important potential land resource in China. Structures and functions of five optimized models selected from more than10 intercropping patterns in the newly built orchards in the uncultivated sloping field were analyzed in this paper. The results showed that organic matter was increased by 5～20%, total Nby 7～40%, total Pby 8～70%, and total Kby 15～80% yearly. Considering its benefit in soil and water conservation, the intercropping model of peanut and autumn soybean was the best, and followed by spring soybean and autumn soybean, tomato and Chinese cabbage, cayenne and tomato, and drought rice and red turnip. Compared with the control, the average soil erosion module and runoff amount of the 5 models were decreased by 44.19%, 38.24%, 39.52%, 37.56%, 37.30%, and 22.40%, 9.28%, 24.11%, 21.60%, 15.93%, respectively.The intercropping model of cayenne and tomato had the highest biomass, and its annual biomass averaged 100267kg·hm^-2. The biomass of intercropping model of peanut and autumn soybean was the second, and the annual value averaged 77026kg·hm^-2.Intercropping model of peanut and autumn had the highest annual productivity, which averaged 15619kg·hm^-2, and that of intercropping model of tomato and Chinese cabbage was the second,averaged 15394kg·hm^-2.The efficiency of energy introjection was in order of cayenne and tomato, tomato and Chinese cabbage, peanut and autumn soybean, spring soybean and autumn soybean, and dry rice and red turnip, and their values were 3.06, 2.16, 2.15, 2.06, and 0.71, respectively.

Key words: Sloping wildland, Newly built orchard, Intercropping, Biological structure, Ecological benefit, water quality, dissolved organic matter, liquid chromatography-organic carbon detection-organic nitrogen detection, molecular weight fraction