几种树种落叶分解的研究

Decomposition of Leat Litters of Different Tree Species

对 8个树种落叶的分解进行了研究 ,各树种落叶年分解失重率分别是 :湿地松 3 2 .7%、马尾松 3 9.0 %、大叶相思 5 7.4%、马占相思 49.7%、南洋楹 67.0 %、尾叶桉 5 5 .1%、荷木 5 6.5 %、黎蒴 49.2 % .应用指数衰减模型计算落叶的年分解率在 0 .42 2～ 1.10 8g/g·a之间 .落叶的年分解失重率与其初始含氮量之间有较好的相关性 (R =0 .81) .分解作用主要发生在水热条件好 ,土壤温湿度较高的雨季 ( 4～ 10月份 )

The decomposition rate and nutrient dynamics of leaf litters for 8 species of trees was studied, The rates (%)of dry matter loss per year by decomposition were: Pinus elliottii 32.7 Pinus massoniana 39.0, Acacia auriculiformis 57.4, Acacia magium 49.7 Albizzia falcata 67.0 Eucalgptus urophylla 55.1,Schima superba 56.5 and Castanopsis fissa 49.2 Their annual decay rates calculated were around 0.422～1.108g/g·a. There was close relationship between initial N concerntration and annual dry matter loss rate of leaf litter (R=0.81). Decomposition occurred mainly in the warm and rainy seasons (April～October).