关键词: 间作, 混作, 油菜, 紫云英, 经济效益, 土地利用效益

Abstract: Aimed to examine the sensitivity of soil N mineralization to temperature change, soil samples were collected along an elevation gradient with four plant communities (evergreen broadleaf forest, coniferous forest, subalpine dwarf forest, and alpine meadow) in Wuyi Mountains Fujian of China. The soils were put in PVC tube, adjusted to 60% of field water-holding capacity, and incubated at 5 ℃, 15 ℃, 25 ℃, and 35 ℃ for 30 days, with their net N mineralization amount and N mineralization rate determined. For the soils from same altitudes, their net N mineralization amount and N mineralization rate increased significantly with increasing temperature; while for the soils from different altitudes, the two indices were in the order of subalpine dwarf forest> evergreen broadleaf forest>alpine meadow>coniferous forest. The Q10 value of soil N mineralization fluctuated between 103 and 154. The Q10 from 15 ℃ to 25 ℃ was higher than that from 5 ℃ to 15 ℃ and from 25 ℃ to 35 ℃, indicating that soil N mineralization was more sensitive to the temperature from 15 ℃ to 25 ℃.

Key words: Inter cropping, Mixed cropping, Rape, Milk vetch, Economic benefit, Land use benefit