3种相思人工林凋落物量及其碳归还动态  

Litterfalls amounts and seasonal dynamics of carbon returns in three Acacia plantations

作　　者：潘辉[1,2] 黄石德[1] 洪伟[3] 赵凯[1,3] 张志鸿[4] 

机构地区：[1]福建省林业科学研究院,福建福州350012 [2]闽江学院旅游系,福建福州350108 [3]福建农林大学林学院,福建福州350002 [4]天马国有林场,福建漳州363704

出　　处：《福建林学院学报》2010年第2期104-108,共5页Journal of Fujian College of Forestry

基　　金：福建农林大学科研基金资助项目(2005015)

摘　　要：通过对福建省平和天马国有林场3种相思人工林凋落物的数量及其组成进行为期1a的定位监测,同时分析凋落物不同组分含碳率,估算出凋落物碳的年归还量及其季节动态。结果表明,黑木相思林的年凋落物量最大,约为7338.28kg·hm-2,其次为卷荚相思林和马占相思林;凋落叶在凋落物中占绝对优势,分别占总凋落物的65.32%、83.71%和68.10%。3种相思人工林凋落物的月变化均呈双峰型季节变化。卷荚相思林、黑木相思林和马占相思林凋落物碳年归还量分别为2875.79、3641.37和2964.91kg·hm-2,卷荚相思林凋落物碳归还季节变化表现为秋季>夏季>冬季>春季;黑木相思林表现为春、夏和秋3个季节较大,冬季较小;马占相思林表现为秋季>夏季>春季>冬季。By the method of litterfall trap, the amounts and composition of litterfalls were studied in three Acacia plantations at Tianma National Forest Farm in Pinghe County, Fujian Province over one year, meanwhile carbon contents of different composition were analyzed and annual carbon returns of litterfalls and its seasonal pattern were estimated. Acacia melanoxylon had the largest annual litterfalls （7 338.28 kg·hm-2）, followed by Acacia concinnatai and Acacia mangiun. Leaves were the predominant litter component for all stands. Of these, the percentages of leaves of Acacia concinnatai, Acacia melanoxylon and Acacia mangiun were 65.32%, 83.71% and 68.10%, respectively. The monthly dynamics of total litterfall showed the double-peak modes in all stands. The litter carbon annual returns of Acacia concinnatai, Acacia melanoxylon and Acacia mangiun were 2 875.79, 3 641.37, 2 964.91 kg·hm-2, respectively. The seasonal variation of litter carbon returns in Acacia concinnatai were autumnsummerwinterspring. In Acacia melanoxylon the higher carbon returns were found for spring, summer and autumn significantly than in winter. In Acacia mangiun those were autumnsummerspringwinter.

关 键 词：相思人工林 凋落物 碳归还 

分 类 号：S718.5[农业科学—林学]