施肥对华北落叶松人工林根茎叶中氮磷含量的影响  

Effects of Fertilization on Nitrogen and Phosphorus Content in Roots, Stems and Leaves of Larix principis-rupprechtii Plantation

作　　者：徐福利[1,2] 赵亚芳[2,3] 张潘[2,3] 王渭玲[1] 于钦民[1] 王伟东[1] 王国兴[1] 

机构地区：[1]西北农林科技大学,杨凌712100 [2]中国科学院水利部水土保持研究所,杨凌712100 [3]中国科学院大学,北京100049

出　　处：《林业科学》2014年第3期139-143,共5页Scientia Silvae Sinicae

基　　金：国家重点基础研究发展计划("973"计划)项目(2012CB416902)

摘　　要：氮和磷是植物生长必需的营养元素，其中氮素是磷脂、蛋白质和核酸的主要成分，氮是叶绿素的成分与光合作用关系密切，氮也作为酶以及许多辅酶和辅基参与元素，并是某些植物激素或维生素的成分调节植物生命活动。磷是核酸、核蛋白和磷脂等大分子物质的主要构成元素，参与光合、呼吸、能量代谢、碳水化合物的代谢和运输等生理过程（潘瑞炽，2008）。A field experiment was conducted to study the effects of fertilization on N and P content of roots, stems and leaves of 20-year-old Larix principis-rupprechtii in a plantation in western Qinling mountain. The results showed that N and P fertilization significantly increased N and P content in the roots, stems and leaves. The N and P content increased largest with the appl!cation of 15 g·m-2 N and 7.5 g · m-2 p2O5 For unfertilized L. principis-rupprechtii, the N and P content in leaves was relatively higher at early growth stage, and then declined and fluctuated, and reached to the lowest valu/e in October. As for in stems, the N and P content increased gradually, and reached to the highest value in September and then declined in October. The N content in roots reduced firstly and reached to the lowest in June, and then exhibited an increase trend. The P content in stems was relatively stable, and the highest value was in August. The tree growth was restricted by the shortage of soil nutrient. N fertilizer and P fertilizer should timely be supplemented in this place to meet the nutritional needs of the normal growth of L. principis-rupprechtii.

关 键 词：施肥 华北落叶松 氮含量 磷含量 养分 

分 类 号：S753.53[农业科学—森林经理学]