摘要
[目的]探究大叶栎人工林的营养元素积累与分配规律,为其丰产经营提供依据。[方法]以广西宁明县速生阶段(13年生)大叶栎人工林为研究对象,对5种营养元素(N、P、K、Ca和Mg)含量、积累量和年净积累量进行了测定和分析。[结果]大叶栎各器官营养元素含量存在差异,不同器官营养元素含量以树叶最高,其次是树枝或干皮、树根,干材最低;树叶和树根中5种元素含量依次为:N>K>Ca>Mg或P;树枝和干材为:K>N>Ca>P或Mg,干皮为:K>Ca>N>P>Mg。大叶栎人工林营养元素积累量为1 370.80 kg·hm^(-2),其中乔木层、灌木层、草本层和凋落物层分别占87.94%、1.14%、0.99%和9.93%。大叶栎人工林乔木层营养元素年净积累量为92.71 kg·hm^(-2)·a^(-1),不同营养元素年净积累量依次为:K>N>Ca>P>Mg;每积累1 t干物质需要5种养分元素10.92 kg。[结论]大叶栎人工林具有较强的营养元素积累能力,但其养分利用效率低于杉木和马尾松人工林。
[Purpose]The nutrient accumulation and distribution characteristics of Quercus griffithii plantation were explored to provide a scientific basis for the management of high-yielding Q.griffithii plantations.[Method]A Q.griffithii plantation at fast-growing stage(13-year-old)in Ningming County of Guangxi was chosen to determine the content,accumulation and annual net accumulation of 5 nutrient elements(N,P,K,Ca and Mg).[Result]The nutrient contents in the leaves of Q.griffithii were the highest,followed by the branch,bark,root and stem.The descending order of the nutrient element contents was N,K,Ca,Mg or P in the leaves and root,K,N,Ca,P or Mg in the branch and stem,and K,Ca,N,P,Mg in the bark.The total nutrient accumulation of Q.griffithii plantation was 1370.80 kg·hm^(-2),of which the arbor layer,shrub layer,herb layer and litter layer accounted for 87.94%,1.14%,0.99%and 9.93%,respectively.The annual net accumulation of the nutrient elements of Q.griffithii plantation was 92.71 kg·hm^(-2)·a^(-1),and the annual net accumulation of the nutrient elements was K>N>Ca>P>Mg.The accumulation of 1 t dry matter required 10.92 kg nutrient elements.[Conclusion]Q.griffithii plantation had relatively high nutrient accumulation ability,but its nutrient utilization efficiency was lower than that of Cunninghamia lanceolata and Pinus massoniana plantations.
作者
付军
李学团
项栽芳
叶家义
何斌
FU Jun;LI Xuetuan;XIANG Zaifang;YE Jiayi;HE Bin(Guangxi State-owned Paiyangshan Forest Farm,Ningming,Guangxi 532500,China;College of Forestry,Guangxi University,Nanning,Guangxi 530004,China)
出处
《亚热带农业研究》
2023年第1期32-37,共6页
Subtropical Agriculture Research
基金
国家自然科学基金项目(31760201)
广西林业科技项目(桂林科字[2022ZC]第80号、第81号、第82号)
广西重点研发计划项目(桂科AB17292008)
广西大学与广西国有派阳山林场科技合作项目(2013-3-8)。
关键词
大叶栎人工林
速生阶段
营养元素
积累
分配
Quercus griffithii plantation
fast-growing stage
nutrient elements
accumulation
distribution
