桉树人工林间种山毛豆,增加了凋落物量和养分归还量,改善了营养元素的生物小循环。在一个轮伐期内山毛豆归还土壤养分的数量如下:氮528.37 kg/hm2,磷28.06 kg/hm2,钾66.20 kg/hm2,钙184.96 kg/hm2,镁57.21 kg/hm2;而同期刚果W5桉归还土壤养分的数量为:氮85.98 kg/hm2,磷3.94 kg/hm2,钾11.80 kg/hm2,钙36.98 kg/hm2,镁18.30 kg/hm2。由于间种山毛豆增加了生态系统的养分收入,减少了水土流失的养分支出,系统的各种养分出现了盈余的状况。 Eucalyptus plantation species of Soybeans, increased litter volume and nutrient return, improve the biological elements of the biological cycle. The amount of soil nutrients returned by Soybean Germplasm during the rotation was as follows: nitrogen 528.37 kg / hm2, phosphorus 28.06 kg / hm2, potassium 66.20 kg / hm2, calcium 184.96 kg / hm2, magnesium 57.21 kg / hm2; The amount of soil nutrients: nitrogen 85.98 kg / hm2, phosphorus 3.94 kg / hm2, potassium 11.80 kg / hm2, calcium 36.98 kg / hm2, magnesium 18.30 kg / hm2. As a result of inter-species mountain soybean increased ecosystem nutrient income, reduce nutrient loss of soil and water loss, the system of various nutrients appeared surplus situation.