本文選題：九龍山　切入點：林分類型　出處：《中南林業(yè)科技大學學報》2017年01期

【摘要】：以北京九龍山轄區(qū)13種林分的土壤為研究對象,分別測定土壤p H值、有機質、全氮、有效磷、速效鉀、堿解氮等肥力指標,按照不同林分對土壤肥力指標進行診斷,并用修正的內梅羅綜合指數法對土壤肥力進行綜合評價。結果表明:土壤p H值呈弱酸性,土壤有機質含量豐富,其中有約一半的林分處于Ⅰ級,但土壤全氮與有效磷含量較低,幾乎所有林分都處于Ⅲ級和Ⅳ級,土壤速效鉀與堿解氮含量中等偏下,幾乎所有林分都處于Ⅱ級和Ⅲ級;土壤綜合肥力系數(Pj)變幅為0.87~1.85,平均為1.20±0.30,其中肥力屬于一般(0.9Pj1.8)林分占總林分的76.29%,白蠟丁香混交林土壤肥力系數較高,而樟子松純林和白蠟與華北落葉松混交林的肥力系數較低,表明九龍山林分土壤肥力總體處于一般水平,且土壤有效磷和全氮含量是影響綜合肥力系數的主要指標,因此,在加強林地土壤的改良方面,提高土壤有效磷和全氮含量是關鍵。
[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，

本文編號：1721741