不同人工植被恢复模式对山核桃林地土壤理化性质的影响

为了探讨山核桃林下不同人工植被恢复模式对山核桃林地土壤养分及山核桃产量的变化规律，对宁国仙霞镇典型山核桃生态严重退化的林地通过人工植被建植5年后的土壤养分进行分析。结果表明：不同植被恢复模式下土壤pH 4.5~6.5；全钾的平均含量0.92 g/kg；全镁的平均含量0.98 g/kg。山核桃林下种植紫穗槐模式、山核桃林下施除草剂模式的含氮量较低；山核桃林下种植白三叶模式的全钙的含量66.25 mg/kg以及含氮量112.68 g/kg最高；山核桃林下种植百喜草模式的含水率17.68%最高，含氮量较高。山核桃林下种植紫穗槐模式样地产量最高，山核桃林下施除草剂模式样地产量最低。经多重比较，不同经营模式山核桃林下，种植紫穗槐模式有效增加山核桃的产量，种植百喜草模式对水分的保持效果最好，土壤pH 5.88对山核桃的生长比较有利。

The Effect of Different Operation Modes on Soil Physical and Chemical Properties of Pecan Forest

To discuss the hickory forest soil nutrient and the variety regularity of pecan’s production under different vegetations artificial recovery mode, analysis of the pecan soil nutrients in the typical stands was made after 5 years of artificial vegetation planting in Xianxia Town, Ningguo where the area was serious ecological degenerated. The results showed that: the value of different vegetation restoration on soil pH was 4.5-6.5; average potassium content was 0.92 g/kg; average magnesium content was 0.98 g/kg. The low nitrogen content was reflected in 2 modes which were Amorpha planting under hickory forest mode and spray herbicide in hickory forest mode; the high calcium and nitrogen content showed in the white clover planting under hickory forest mode, which was 112.68 g/kg and 66.25 mg/kg. The high moisture content was showed in Hickory bahia grass understory planting pattern which was 17.68%. The highest production was in planting Amorpha mode and the lowest was in herbicide mode. After multiple comparisons, among different business modes in pecan forest, planting Amorpha mode effectively increased production, planting Hickory bahia grass mode was beneficial to the water and soil conservation, the favorable ph of pecan growing was 5.88.