尾叶桉与马占相思人工复层林碳储量及分布特征研究  

Carbon Storage and Spatial Distributions Characteristic of Stratified Mixed Stands of Eucalyptus urophylla and Acacia mangium

作　　者：叶绍明[1] 龙滔[1] 蓝金宣[1] 覃连欢[1] 

机构地区：[1]广西大学林学院,广西南宁530004

出　　处：《江西农业大学学报》2010年第4期735-742,758,共9页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家林业局"948"创新项目(2005-4-03);广西自然科学基金项目(桂科字0991035);广西林业"十一五"科技项目(林科字2006-0009);广西大学博士科研基金项目

摘　　要：应用相对生长法和样方收获法研究3年生尾叶桉与马占相思不同混交比例人工林的碳素含量、碳储量以及空间分配特征。结果表明:林分各器官、草本层、灌木层、枯落物层的碳素含量分别介于433.6～491.5g/kg,412.9～437.3g/kg,430.6～437.3g/kg,458.6～465.3g/kg。在相同混交比例下,乔木层碳储量随林分密度的增加而上升,灌木层、草本层和枯落物层碳储量随林分密度的增加而下降,土壤层在不同处理下碳储量无明显变化。当尾叶桉与马占相思混交比例为1∶1时,林分密度为1050株/hm2和1320株/hm2的生态系统碳储量分别为55.247t/hm2,67.396t/hm2;当尾叶桉与马占相思混交比例为2∶1时,林分密度810株/hm2和1170株/hm2的生态系统碳储量分别为69.106t/hm2,83.446t/hm2;当林分密度同为1727株/hm2时,尾叶桉纯林、尾叶桉与马占相思以1∶1.6比例混交林的生态系统碳储量分别为76.356t/hm2,95.502t/hm2。在相同混交比例下,灌木层、草本层、枯枝落叶层碳储量随林分密度的增加而下降;在相同密度下,尾叶桉纯林灌木层、草本层、枯枝落叶层碳储量均比混交林高。在6个林分更新处理中,当尾叶桉与马占相思混交比例为1∶1.6时,混交林的成层性最明显,林分总碳储量最高,且与其他各处理间的差异达到极显著水平,是固碳能力较佳的一种混交比例。The carbon storage and spatial distributions characteristic of the stratified mixed forest of Eucalyptus urophylla and Acacia mangium with different mixed proportion were studied by sample plot harvesting method and allometric dimension analysis.The results showed that carbon content of different organs,herb layer,shrub layer,litter layer were ranged from 433.6-491.5 g/kg,412.9-437.3 g/kg 430.6-437.3 g/kg and 458.6-465.3 g/kg.In the stratified mixed stands of E.urophylla and A.mangium at the same mixed proportion,with the increasing of forest density,carbon storage in tree layer increased while the carbon storage of shrub layer,herb layer and litter layer decreased.In addition,the carbon storage of soil depth shows little change in different treatments.In two stands with density of 1 050 trees/hm2 and 1 320 trees/hm2 at the mixed proportion of 1∶ 1,respectively,the carbon storage of total ecosystem were 55.247 t/hm2 and 67.396 t/hm2,In another two stands with density of 810 trees/hm2 and 1 170 trees/hm2 at the mixed proportion of 2∶ 1,respectively,the carbon storage of total ecosystem were 69.106 t/hm2 and 83.446 t/hm2;When the stand density is 1 727 trees/hm2 in the pure stand and the mixed stand with proportion of 1∶ 1.6 with E.urophylla to A.mangium,the carbon storage of total ecosystem were 76.356 t/hm2 and 95.502 t/hm2.The carbon storage of shrub layer,herb layer and litter layer decreased with the increasing of stand density at the same mixed proportion and these terms in the pure stand are higher than that in the mixed stand.As a conclusion,in the six treatments of stand regeneration patterns,the mixed proportion of 1∶ 1.6 with E.urophylla × A.mangium has obvious layers and highest total ecosystem carbon storage,is the more rational pattern and it is extremely significant to the other treatments.

关 键 词：人工复层林 碳储量 尾叶桉 马占相思 

分 类 号：S714[农业科学—林学]