吊罗山热带林4种主要林木的凋落叶分解研究

目的]为了研究吊罗山热带林4种主要林木的凋落叶分解情况。方法]于2004年4月采用尼龙分解袋的方法,对海南吊罗山自然保护区内绿楠、闽粤栲、黄樟和青皮的凋落叶进行了一年的分解研究。结果]4种凋落叶的残留率都与分解时间成反比,累计分解率总体呈上升趋势;黄樟凋落叶的分解率在各个季节明显高于其他3种凋落叶的分解率,4个树种的年分解率大小依次为黄樟(80%)>绿楠(74%)>闽粤栲(69%)>青皮(56%);4种凋落叶在试验进行到90 d时,分解速率最快,月分解率均达到了最大值。各凋落叶分解变化趋势与气温、雨量及相对湿度等主要环境因子的变化趋势基本一致。结论]黄樟分解最快,青皮最慢。夏季和秋季各树种凋落叶分解最快。

Study on Leaf-litter Decomposition of 4 Kinds of Main Forest Trees of Tropical Forests in Diaoluo Mountain

Objective] The research aimed to study the leaf-litter decomposition of 4 main forest trees of tropical forests in Diaoluo Mountain.Method] In the test with nylon-bag method in the April of 2004,the decompositions of Manglietia hainanensis,Castanopsis fissa,Cinnamomum porrectum and Vatica hainanensis in Diaoluo mountain nature reserve of Hainan Island were studied for one year.Result] The residual rate of 4 kinds of leaf-litters was inversely proportional to the decomposition time and the accumulative decomposition rate showed an increasing trend generally.The decomposition rate of C. porrectum leaf-litters in every season was obviously higher than that of the other three species,and the annual decomposition rates of 4 species were as follows: C.porrectum(80%)>M.hainanensis(74%)>C.s fissa(69%)>V.hainanensis(56%).On the 90 d of test period,the decomposition rates of 4 kinds of leaf-litters were the fastest,with the monthly decomposition rates up to the maximum.The change tendency of leaf-litter decomposition was generally in accord with that of main environmental factors such as air temperature,rainfall and relative humidity.Conclusion] The decomposition of C.porrectum was fastest and that of V.hainanensis was lowest.The decomposition of various tree species was fastest in summer and autumn.