【摘要】 在林分样地调查分析的基础上，研究了３ 个不同生长发育时期即未结果期、结果初期和盛果初期锥栗人工林各器官Ｎ、Ｐ、Ｋ、Ｃａ 、Ｍｇ 的养分浓度及其变化。结果表明：各种养分元素的存留量从未果期到盛果初期逐渐增大，Ｎ 与Ｃａ 的积累占很大比例，Ｋ、Ｍｇ 次之，存留量最少的元素均为Ｐ。在未结果期，Ｎ 的归还量最大，Ｃａ 次之，最小为Ｐ。始果期，Ｃａ 与Ｎ 的归还量仍占首位，其次是Ｋ，Ｐ最少。至盛果初期，Ｋ 的归还量最大，Ｎ 次之，最小为Ｐ。各元素循环速率，从未果期至盛果初期，呈增大趋势，元素周转期则呈缩短。对产生这些变化的原因进行了必要的分析。研究结果可为不同时期养分补偿措施的制定提供参考更多还原

【Abstract】 Based on the sampling analysis,concentration and variation of five elements which are N,P,K,Ca and Mg in different organs for three growth stages of Castanea henryi plantation have been studied.The results show retention of each elements gradually become higher from the first stage to the third stage.The accumulation for N and Ca made up large percentage,then was K,Mg,the least was P.During the first growth stage,the return were 1.763 kg·hm -2 a -1 for N,1.695 kg·hm -2 a -1 for Ca,1.252 kg·hm -2 a -1 for K,0.632 kg·hm -2 a -1 for Mg and 0.156 kg·hm -2 a -1 for P respectively.The second stage,the return increased by 6.6901 kg·hm -2 a -1 for Ca,6.0027 kg·hm -2 a -1 for N,3.6796 kg·hm -2 a -1 for K,2.0822 kg·hm -2 a -1 for Mg and 0.5945 kg·hm -2 a -1 for P respectively.But in the third stage, K become the most element of return and the least of return was still P.Circulation rate of each element from the first to the third stages increased and turnover periods shortened.The reasons of variation have also been analyzed.更多还原