不同年龄橡胶树枯落物碳归还量及年释放量比较1

Comparison of annual returned carbon content of litters and annual carbon emission of the rubber trees of different ages

以橡胶树PR107为材料,在海南省中部的琼中黎族苗族自治县大丰农场进行了为期1年的观测,分别于不同月份研究了5个年龄段(8～24a)的橡胶树枯枝叶凋落量及其凋落物中碳归还含量。结果表明:(1)8a、12a、15a、19a、24a橡胶人工林收集的凋落物各器官含碳量之间差异不显著。(2)8a、12a、15a、19a、24a橡胶人工林凋落物碳的年归还量分别为2.41 t/hm2、2.48t/hm2、2.85 t/hm2、3.56 t/hm2、3.79 t/hm2。随着树龄的增大,其凋落物碳归还量也随之增加。(3)调查样地的凋落物碳年释放量各个树龄分别为0.12 t/hm2、0.21 t/hm2、0.27 t/hm2、0.19 t/hm2、0.27 t/hm2。随着树龄的增加,凋落物释放量基本呈现增大的趋势。

Choosing the rubber tree PR 107 as the subject,we conducted one-year observation on Dafeng Farm of Li and Miao Autonomous County in the central part of Hainan Province.The observation,in different months,researched into the quantity of fallen branches and leaves and the quantity of carbon returned from the litters of the rubber trees of five different age groups(8-24a).The results showed that the difference between the carbon content of each organ of the litters collected in 8a,12a,15a,19a,and 24a rubber plantation was not distinct.The annual returned carbon content of the litters of 8a,12a,15a,19a and 24a rubber plantation was 2.41,2.48,2.85,3.56 and 3.79 t/hm2,respectively.As the age of the tree increased,the annual returned carbon content of the litters increased.The annual carbon emission of litters in the research area was 12,0.21,0.27,0.19 and 0.27 t/hm2at each tree age.As the age of the tree increased,the carbon emission of litters showed an increasing tendency