敖汉旗小流域不同植被类型区土壤养分状况分析

研究分析敖汉旗黄花甸子小流域不同植被类型区不同土层的主要养分含量。结果表明：不同植被类型区，天然灌木次生林对土壤养分的富集作用较明显；人工林中，混交林对土壤的改良效果较纯林的要好；天然草地最小。同一植被类型区，土壤有机质、全氮、速效磷、速效钾及微生物生物量碳除40~60 cm土层出现波动外总体呈随土层加深而递减的趋势，pH值呈增大的趋势。

Analysis of soil nutrient condition under different vegetation patterns of small watershed in Aohan County

In this paper， we analyzed the main soil nutrients of different soil layers in different vegetation patterns in Huanghuadianzi small watershed in Aohan County of Chifeng city. The result showed that in different vegetation patterns， the secondary forest, of natural bush had an obvious effect on the nutrient and concentration of organic. In the artificial forest， mingled forest had a better improving effect on soil than the pure forest, and natural grassland had the smallest effect. In the same vegetation patterns， organic， total nitrogen， available phosphorus， available potassium and microbial C presented an overall reduction trend with the deepening of soil layer, while pH presented an increasing trend except 40-60 cm soil layers.