杉木火力楠混交幼林养分元素含量,分配的研究

AN INVESTIGATION ON THE CONTENT AND DISTRIBUTION OF MAJOR NUTRIENT ELEMENTS IN YOUNG MIXED STANDS OF CUNNINGHAMIA LANCEOLATA AND MICHELIA MACCLUREI

摘要: 本文作了广东南亚热带5年生杉木火力楠混交林以及杉木纯林生物量,林木器官的养分元素(N、P、K、Ca、Mg)含量和养分分配的研究。结果表明:5年生杉木幼林的养分元素N、P、K、Mg含量较其它龄组(7～9.10～20,20～30年)的为高,Ca则较低;杉木和火力楠对这几种养分元素的需要量顺序基本相同,均为N>K(?)Ca>Mg>P.但混交林中,单位面积上火力楠的养分吸收量低于杉木,只有镁例外。

Abstract: In this paper, the biomass, content and distribution of the major nutrient elements (N, P, K, Ca, Mg) during the period of one year in young pure stands of Cunninghamia lanceolate and young mixed-stands of Cunninghamia lanceolata and Michelia macclurei were investigated. The result showed that the content of nutrient elements in the five-year stand was higher than that of the other age-groups (7-8, 10-2020-30yr. ) stands, except the Ca. The requirements for nutrient elements in both species were the same, being N > K Ca>Mg>P, but the relative rpquirement for Michelia macchtrei was lower than that of Cunninghamia lanceolata, except the Mg.