华南4种乡土阔叶树种枯落叶分解能力 The leaf litter decomposition of four native broad-leaved tree species in South China

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乡土阔叶树种, 枯落叶, 人工林, 分解速率, 养分释放, Native broad-leaved trees, Leaf litter, Plantation, Decomposition rate, Nutrient release


采用分解袋法,研究了樟树(Cinnamomum camphora (L.) Presl)、米老排(Mytilaria laosensis Lec.)、火力楠(Michelia macclurei Dandy)和黎蒴(Castanopsis fissa Rehd. et Wils.) 4种华南乡土阔叶树种枯落叶在阔叶混交人工林和湿地松人工林下的分解能力。4个树种枯落叶的分解速率大小依次为:樟树>米老排>火力楠>黎蒴,它们在混交林中的分解速率均大于松林。4个树种枯落叶的分解动态符合Olson指数模型,分解系数(K)在混交林中均大于人工林,且在两种林地中均表现为樟树>米老排>火力楠>黎蒴。不同时间枯落叶养分动态分析结果显示,4个树种枯落叶的N元素分解均出现先富集,后释放的特点,但仅在松林下出现N元素的净释放;K元素释放方式表现为先释放,后富集,仅在阔叶林下出现K元素净释放;Ca、Mg和B元素均表现为分解前期少量富积,之后开始大量释放的变化趋势,它们在阔叶林和松林下均出现净释放。4个树种在P元素释放方式上差异较大,趋势不明显。

The leaf litter decomposition of Cinnamomum camphora (L.) Presl, Mytilaria laosensis Lec., Michelia macclurei Dandy, and Castanopsis fissa Rehd. et Wils. in mixed broad-leaved tree plantation and pine plantation were studied with litterbag method for one year. Leaf litter decomposition rates of the four species were in the order: Cinnamomum camphora>Mytilaria laosensis> Michelia macclurei>Castanopsis fissa. The decomposition rates of all species were higher in mixed than pine plantation. The decomposition processes of all species follow Olson′s exponential model. The decomposition coefficient (K) of all species were also higher in mixed than pine plantation and had the same order as the leaf litter decomposition rates. The analysis of changes in leaf litter nutrients over time showed that the nitrogen contents of all species studied first increased and then decreased. However, net release of N only occurred in pine plantation. Potassium contents appeared to decrease first and then increase and net release was ony found in mixed plantation. For Ca, Mg, and B, they all showed a similar pattern of increasing at the beginning and then decreasing at the end. They all had net release in both mixed and pine plantation. The release of phosphorus varied greatly between species and no clear trend was found.

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生态学报 Acta Ecologica Sinica

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