长汀不同郁闭度马尾松林降雨淋溶养分输入特征  

Characteristics of rainfall leaching nutrient input in Pinus massoniana forest with different canopy density of Changting

作　　者：黄智军[1,2] 刘青青 侯晓龙[1,2] 吴鹏飞[1,2] 靳聪[1] 马祥庆 HUANG Zhijun;LIU Qingqing;HOU Xiaolong;WU Pengfei;JIN Cong;MA Xiangqing(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;State Forestry Administration Fujian Changting Red Soil Hilly Ecosystem Observation and Observation Station,Changting,Fujian 366300,China)

机构地区：[1]福建农林大学林学院,福建福州350002 [2]国家林业局福建长汀红壤丘陵生态系统定位观测研究站,福建长汀366300

出　　处：《森林与环境学报》2018年第2期129-134,共6页Journal of Forest and Environment

基　　金：国家科技支撑计划项目(2014BAD15B02);福建省科技厅重点项目(2017Y0001)

摘　　要：降雨淋溶过程对森林生态系统养分循环具有重要影响,是水土流失区土壤养分的重要来源之一。为探究降雨淋溶过程对南方红壤侵蚀区马尾松林养分输入特征的影响,以福建长汀不同郁闭度(0.2,0.4,0.6,0.8)马尾松林为研究对象,利用自制的降雨采样装置,采集不同郁闭度马尾松林大气降雨、穿透雨和树干茎流样品,测定分析N、K、Ca、Na、Mg和Mn 6种元素。结果表明:大气降雨经过冠层再分配后,除Ca元素外,各养分元素含量在穿透雨和树干茎流中均随郁闭度的增加而增加;树干茎流中Ca元素含量则以郁闭度0.4最高,郁闭度0.6最低;在冬季或者降雨量较少的月份郁闭度过高会使养分含量降低。随着马尾松林林冠层密度增大,吸附粉尘等干沉降物质的量增多,导致降雨淋溶时各元素含量增大,从而增加马尾松林养分输入,促进养分循环。Rainfall and leaching process has an important influence on nutrient cycling in forest ecosystem which is one of the important causes for the soil nutrient and water loss.Influence of rainfall leaching process on the nutrient importing characteristics of Pinus massoniana forest were investigated in the south China.Soil and water samples were collected in different canopy density(0.2,0.4,0.6,0.8)of Pinus massoniana forest,and the content of six nutrient elements(N,K,Ca,Na,Mg and Mn)were measured.The results revealed that:after the redistribution of rainfall through canopy,the concentration of nutrient elements,except Ca,in throughfall and stemflow had increased with the rise of canopy density.The content of Ca in the stemflow was highest under canopy density of 0.4 and was the lowest under canopy density of 0.6.In winter and some month of low rainfall,nutrient content will reduce if the canopy density is over high.With the growth of canopy density in Pinus massoniana forest,the amount of dry sediment increased,such as adsorption dust,resulted in the rise of the content of elements in rainfall leaching,which increased the nutrient input of Pinus massoniana forest and promoted the nutrient cycle.

关 键 词：郁闭度 马尾松 大气降雨 穿透雨 树干茎流 养分输入 

分 类 号：S774[农业科学—森林工程]