华池林区少脉椴生境土壤养分及肥力研究

Soil Nutrients and Fertility of Tilia paucicostata Maxim Habitat in Huachi Forest Region

为进一步了解华池林区内少脉椴生境土壤养分及肥力状况,对其生境0~80 cm土壤进行取样分析,并采用改进的内梅罗综合指数法评价其土壤肥力状况。结果表明,少脉椴分布区0~80 cm土层土壤含水量为5.75%~38.13%,有机质、全N含量分别为2.58~104.71、0.18~5.62 g·kg^(-1),碱解N、速效P、速效K含量分别为30.24~229.71、3.4~16.9、79.3~663.0 mg·kg^(-1),pH值为7.0~7.7;随着土层深度的增加,土壤含水量、有机质、全N、碱解N含量呈现递减趋势,pH值呈现递增趋势,速效P含量表现出先减少后增加再减少趋势,速效K含量未表现出明显的变化趋势。除豹子川中梁(BL)区域外,少脉椴其他分布区土壤肥力均随着土层深度增加而下降,0~10 cm土层,少脉椴各分布区土壤肥力全部达到良好;10~20 cm土层,少脉椴在东华池桥儿沟(DG)和南梁东沟(NG)区域土壤肥力达到良好,在其他区域土壤肥力均一般;20~50 cm土层,少脉椴在各分布区土壤肥力均为一般;在50~80 cm土层,土壤肥力均贫瘠。少脉椴生境土壤养分具有明显的表聚效应,土壤综合肥力指数(1.54)处于中等偏上水平。

In order to further understand the soil nutrient and fertility status of Tilia paucicostata Maxim habitat in Huachi forest region,the soil in the habitat was sampled at 0-80 cm layer and analyzed,and the modified Nemerow integral index was used to evaluate the soil fertility status.The results showed that the variation range of soil water content,the contents of organic matter,total nitrogen,alkaline nitrogen,available phosphorus,available potassium and the soil pH in 0-80 cm soil layer were 5.75-38.13%,2.58-104.71 g·kg^(-1),0.18-5.62 g·kg^(-1),30.24-229.71 mg·kg^(-1),3.4-16.9 mg·kg^(-1) and 6.99-7.73,respectively.With the increase of soil depth,the soil water content,the contents of organic matter,total nitrogen,and alkaline nitrogen showed a decreasing trend,while the soil pH value showed an increasing trend,the content of available phosphorus first decreased,then increased and finally decreased,but the content of available potassium did not show an obvious trend of change.The soil fertility in distribution regions of Tilia paucicostata Maxim decreased with the increase of soil depth except BL.In the 0-10 cm soil layer,the soil fertility of each distribution area of Tilia paucicostata Maxim reached the level of'well';in the 10-20 cm soil layer,the soil fertility in DG and NG reached"well",whereas moderate in other areas;in the 20-50 cm soil layer,the soil fertility was on average in all distribution areas;in the 50-80 cm soil layer,the soil fertility was poor in each distribution area.In the habitat of Tilia paucicostata Maxim,soil nutrients had obvious surface aggregation effect,and the soil comprehensive fertility index was 1.54 which was above the medium level.