楠木叶凋落物的分解及其养分动态  

Decomposition and the nutrient dynamics of Phoeba bournei leaf litter

作　　者：郭玉硕[1] 

机构地区：[1]福建农林大学西芹教学林场,福建南平353001

出　　处：《福建林学院学报》2007年第3期199-202,共4页Journal of Fujian College of Forestry

基　　金：福建省自然科学基金资助项目(B0310016)

摘　　要：采用网袋法,对楠木叶凋落物分解进行1 a的动态观测研究。结果表明:楠木叶凋落物的分解失重率为42.0%,腐解率为0.001 6 d-1,完成50%分解以及完成95%分解所需的时间分别为1.32和5.26 a。分解过程中,N存在一定的富集现象;P处于波动的富集状态;K呈现单调下降的变化趋势;而wC/wN比和C浓度都是前期少量上升而后期始终下降。各营养元素的年释放率大小顺序依次为K(81.2%)>C(53.6%)>N(36.9%)>P(29.0%)。The nylon bag method was adopted to observe the decomposition of Phoeba bournei leaf litter for one year. The results showed that the weight loss rate of decomposition of P. bourne/leaf litter for one year was 42. 0%, the decomposition coefficient was 0. 001 6 d^=1 and the finish time of 50% and 95% decomposition were 1.32 and 5. 26 a, respectively. During the course of decomposition, N content was increasing in a certain degree, P content was fluctuanfly increasing slowly, K content always decreased, C content and Wc/WN were increasing a little in the earlier stage but decreasing in the later stage. The sequence of releasing rate of N, P, K and C was K（81.2% ） 〉 C（53.6% ） 〉 N（36. 9% ） 〉 P（29. 0% ）.

关 键 词：楠木 凋落叶分解 养分动态 

分 类 号：Q715[生物学—分子生物学]