不同林龄橡胶凋落物叶分解特性与有机碳动态研究  

Leaf-litter Decomposition Characteristics and Carbon Dynamics Affected by Forest Agesin Rubber Plantations

作　　者：金龙[1,2] 吴志祥[2] 杨川[2] 管利民[2] 赖华英[2] 

机构地区：[1]海南大学,海南海口570228 [2]中国热带农业科学院橡胶研究所农业部儋州热带作物科学观测实验站,海南儋州571737

出　　处：《热带作物学报》2015年第4期698-705,共8页Chinese Journal of Tropical Crops

基　　金：中国热带农业科学院橡胶研究所基本科研业务费专项"橡胶林生态系统长期定位观测与研究"(No.1630022014011)

摘　　要：通过网袋法,研究一年内6 a、12 a、20 a、28 a共4组不同林龄橡胶凋落物叶分解及有机碳动态变化的过程。结果表明：（1）不同林龄橡胶凋落物叶均表现为慢-快-慢的分解趋势,经1 a的分解,4组林龄组橡胶凋落叶残留率分别为28.33%、30.53%、31.59%和33.89%。（2）不同林龄橡胶凋落物叶分解系数为1.376 2~1.608 8,平均值为1.498 2,大小顺序为6 a〉12 a〉18 a〉28 a,分解50%和95%所需时间分别为0.43、0.45、0.47、0.50 a和1.86、1.96、2.03、2.18 a。（3）林龄显著影响橡胶凋落物叶初始N含量、P含量、木质素/N比、C/P比与木质素/P比,但对C含量、木质素含量及C/N比影响不明显。（4）初始C/N比极显著影响橡胶凋落物叶分解速率,而初始P含量对凋落物分解影响不显著（5）4组林龄组橡胶凋落物叶有机碳浓度是一个先上升后下降的过程,研究结束时,4组林龄橡胶凋落物叶有机碳分别释放了77.58%、79.41%、75.89%和75.02%,其动态变化过程显著符合一元多项式模型,决定系数（R2）在0.88以上。An experiment was con ducted to study the decomposition characteristics and carbon dynamics of leaf litter in rubber plantation of different ages（6 a, 12 a, 20 a, 28 a） during one year of decomposition using mesh bag method. And the results showed as following：（1）The leaf litter decomposition dynamics was basically consistent between four different age groups, and the residues of litter in rubber plantation of different ages was 28.33%,30.53%, 31.59%, 33.89%, respectively, and a non-significant difference was observed between different age groups.（2）The decomposition constant ranged from 1.376 2 to 1.608 8, with an average of 1.498 2, the times required for 50% and 95% of leaf decomposition was 0.43 a, 0.45 a, 0.47 a, 0.50 a and 1.86 a, 1.96 a, 2.03 a, 2.18 a,respectively.（ 3）Apart from the contents of C, lignin, and C/N ratio, the initial N content, P content, lignin/N ratio, C/P ratio, and lignin/P ratio of leaf-litter were significantly affected by plantation ages.（4）The decomposition rates of leaf litter in rubber plantation of different ages were significant negatively correlated with the initial C/N ration, and a weak negatively correlated with the P contend.（5）During the whole decomposition process, the release of carbon in 4 rubber plantations accumulated 75.02%~79.41%, and it＇s release process was significantly in line with polynomial model, the coefficient of determination（R2）more than 0.88.

关 键 词：橡胶林 不同林龄 凋落物 分解速率 有机碳 

分 类 号：S718[农业科学—林学]