吊罗山热带林4种主要林木的凋落叶分解研究

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

[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。

[Objective] The researeh aimed to study the leaf-litter decomposifion 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, Cinnamomam 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 rote of C. porrectum leaf-litters in every season was obviously higher than that of the other three species, and the annual decomposition rotes of 4 species were as follows： C. porrectum （80%） 〉 M, hainanensis （74%） 〉 C. sfissa （69%） 〉 V. hainanensis （56%）. On the 90 d of test period, the decomposition rotes of 4 kinds of leaf-litters were the fastest, with the monthly decomposition rates up to the mzximum. The change tendency of leaf-litter decomposi- tion 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.