大叶栎人工林速生阶段的营养元素积累与分配  

Nutrient accumulation and distribution of Quercus griffithii plantation at fast-growing stage

作　　者：付军 李学团 项栽芳 叶家义 何斌[2] 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)

机构地区：[1]广西国有派阳山林场,广西宁明532500 [2]广西大学林学院,广西南宁530004

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)。

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.

关 键 词：大叶栎人工林 速生阶段 营养元素 积累 分配 

分 类 号：S792.39[农业科学—林木遗传育种]