北京九龙山不同林分土壤肥力诊断与综合评价

发布时间：2018-04-08 13:06

  本文选题：九龙山　切入点：林分类型　出处：《中南林业科技大学学报》2017年01期

【摘要】：以北京九龙山辖区13种林分的土壤为研究对象,分别测定土壤p H值、有机质、全氮、有效磷、速效钾、碱解氮等肥力指标,按照不同林分对土壤肥力指标进行诊断,并用修正的内梅罗综合指数法对土壤肥力进行综合评价。结果表明:土壤p H值呈弱酸性,土壤有机质含量丰富,其中有约一半的林分处于Ⅰ级,但土壤全氮与有效磷含量较低,几乎所有林分都处于Ⅲ级和Ⅳ级,土壤速效钾与碱解氮含量中等偏下,几乎所有林分都处于Ⅱ级和Ⅲ级;土壤综合肥力系数(Pj)变幅为0.87~1.85,平均为1.20±0.30,其中肥力属于一般(0.9Pj1.8)林分占总林分的76.29%,白蜡丁香混交林土壤肥力系数较高,而樟子松纯林和白蜡与华北落叶松混交林的肥力系数较低,表明九龙山林分土壤肥力总体处于一般水平,且土壤有效磷和全氮含量是影响综合肥力系数的主要指标,因此,在加强林地土壤的改良方面,提高土壤有效磷和全氮含量是关键。
[Abstract]:Soil fertility indexes such as pH value, organic matter, total nitrogen, available phosphorus, available potassium and alkali-hydrolyzed nitrogen in 13 stands of Jiulong Mountain District of Beijing were determined, and soil fertility indexes were diagnosed according to different stands.The comprehensive evaluation of soil fertility was carried out with the modified Nemero comprehensive index method.The results showed that soil pH value was weak acid, soil organic matter content was abundant, about half of the stands were in grade 鈪，

本文编号：1721741