摘要
在福建三明采用 2种方法测定 2 7a生杉木林的杉木叶和小枝凋落物的分解率 .采用网袋法 (孔径 0 .5mm尼龙网袋 )测定的杉木叶和小枝凋落物残留率Olson指数模型的分解系数 (k值 )分别为 0 .76 92a-1和 0 .2 5 0 1a-1,相应的第 1年的分解率分别为 5 3.6 6 %和 2 2 .13% ;另一种测定k值的方法较为准确 ,是通过计算凋落物年产量与地面凋落物储量的比值得到 ,采用该方法计算的杉木叶和小枝凋落物的k值分别为 1.788a-1和 0 .86 2 2a-1,分别是网袋法测定值的 2 .32和 3.5 4倍 ,相应的第 1年的分解率分别为 83.2 7%和 5 7.78% ,分别是网袋法测定值的 1.5 5倍和 2 .6 1倍 .采用后一种方法测定的凋落物分解率可以解决尼龙网袋法测定分解速率结果偏低的问题 .图 2表 3参
Two approaches were used to assess the decomposition rates of leaf and twig litter of a 27-year-old Chinese fir plantation in Sanming, Fujian, China. Decomposition constants (k values) of Olson's exponential decay model of leaf and twig litter of Chinese fir, determined by mesh bag technique (0.5-mm-mesh nylon bag), were 0.769 2 a -1 and 0.250 1 a -1 , respectively, and corresponding weight loss of leaf and twig litter after the first year were 53.66% and 22.13%, respectively. Another approach introduced for determining litter decomposition rates, which is more precise, was to calculate the decomposition constant (k values) of Olson's exponential decay model through the ratio of annual litter input to forest floor mass. Decomposition constants (k values) of leaf and twig litter of Chinese fir calculated by this way were 1.788 a -1 and 0.862 2 a -1 , respectively, 2.32 and 3.54 times as much as those determined by mesh bag technique, respectively, and corresponding weight loss of leaf and twig litter after the first year were 83.27% and 57.78%, respectively, 1.55 and 2.61 times as much as those determined by mesh bag technique. Decomposition rates determined by the latter approach solved the problem of underpredicting litter decomposition rates by mesh bag technique. Fig 2, Tab 3, Ref 13
出处
《应用与环境生物学报》
CAS
CSCD
2003年第4期352-356,共5页
Chinese Journal of Applied and Environmental Biology
基金
福建省青年科技人才创新项目 (2 0 0 1J0 38)
福建省科委重大基础研究项目 (2 0 0 0F0 0 4 )
高等学校骨干教师资助计划
福建省自然科学基金 (B0 1 1 0 0 2 5)资助~~
关键词
杉木林
凋落物
产量
分解率
储量
Chinese fir
litter
decomposition
accumulation
return
simulation model
