摘要
为探究桂西南不同林龄马尾松(Pinus massoniana)人工林营养元素积累及其分布格局,为该区域马尾松人工林丰产经营提供科学依据,以广西宁明县马尾松桐棉种源人工林为研究对象,测定不同林龄(5、10和15年生)马尾松桐棉种源人工林各器官5种营养元素(N、P、K、Ca和Mg)含量,对不同林龄马尾松桐棉种源人工林营养元素含量、积累量、年净积累量及其分配格局进行研究。结果表明,不同林龄马尾松各器官营养元素含量以树叶最高,干材最低;各器官中不同营养元素含量表现为N>Ca或K>Mg或P。5、10和15年生马尾松桐棉种源人工林营养元素积累量分别为552.68、868.65和1164.71 kg/hm^(2),其中乔木层分别占87.14%、87.70%和86.36%,林下植被层分别占7.30%、6.68%和6.45%,凋落物层分别占5.56%、5.62%和7.29%;营养元素年净积累量分别为96.32、76.18和66.95 kg·hm^(-2)·a^(-1),林木每生产1 t干物质分别需要的5种营养元素含量为13.95、8.15和6.21 kg。
In order to understand nutrient element accumulations and distribution characteristics of Pinus mas⁃sonianas plantations in southwest Guangxi and provide scientific basis for management of high yields of P.mas⁃soniana plantations,taking Tongmian provenance of P.massoniana plantations in Ningming county of Guangxi as objects,nutrient contents,accumulations,annual net accumulations and distribution characteristics of Tong⁃mian provenance of P.massoniana plantations with different stand ages(5,10 and 15-year-old)were studied by measuring contents of five nutrient elements(N,P,K,Ca and Mg)in different organs.Results showed that leaf had the highest contents of nutrient elements,and stem had the lowest contents.Order of contents of differ⁃ent nutrient elements in different organs was N>Ca or K>Mg or P.Nutrient element accumulations of 5,10 and 15-year-old Tongmian provenance of P.massoniana plantations were 552.68,868.65 and 1164.71 kg/hm^(2).Arbor layer accounted for 87.14%,87.70%and 86.36%,undergrowth layer accounted for 7.30%,6.68%and 6.45%,and litter layer accounted for 5.56%,5.62%and 7.29%.Annual net accumulations of nutrient elements were 96.32,76.18 and 66.95 kg·hm^(-2)·a^(-1).Nutrient element contents required per 1 t dry matter produced of P.massoniana plantations were 13.95,8.15 and 6.21 kg.
作者
李春宁
李学团
魏国余
何斌
王聪
Li Chunning;Li Xuetuan;Wei Guoyu;He Bin;Wang Cong(College of Forestry,Guangxi University,Nanning,Guangxi 530004,China;Guangxi State-owned Paiyangshan Forest Farm,Ningming,Guangxi 547200,China)
出处
《广西林业科学》
2023年第2期146-152,共7页
Guangxi Forestry Science
基金
广西创新驱动发展专项资金项目(桂科AA17204087-11)
广西重点研发计划项目(桂科AB17292008)
国家自然科学基金项目(31760201,31560206)。
关键词
营养元素
积累量
年净积累量
马尾松人工林
nutrient element
accumulation
annual net accumulation
Pinus massoniana plantation
