摘要
本文研究了鼎湖山自然保护区南亚热带常绿阔叶林的森林凋落物量及其年凋落节律、分解速率、化学成分,并对森林的建群树种凋落叶的有机组成和营养元素作了探讨。研究结果指出:鼎湖山森林凋落物的特征具有较多热带季雨林的特性;森林凋落物量及其营养元素的回归,在森林生态系统中占有十分重要的地位;建群树种和优势树种叶凋落量及营养元素的含量在凋落物总量中的比重,进一步说明它们在森林群落中起的重要作用,也是评价不同森林类型的依据之一。
The present paper deals with the production, variation rhythm, decomposition rate and mineral contents of litter in the subtropical monsoon evergreen broad-leaved forest in the Dinghu Mountain, The organic matter and the nutrient elements in the leaffall of the main edificators in this forest were also studied.
The 5-year observation results show that the annual litter ranges from 7t/ha to 11t/ha, with an average of 9.2 t/ha. The variation rhythm of the litter is remarkable; there are 2 peaks in each year: one occurs at the beginning ofthe rainy season (April or May), the other appears at the end of the rainy season (September or October). But in dry season the litter production is low and has little annual variation. In the total litter, the rhythm is conspicuous in the leaf fraction, while it is imperceptible in twig and miscellany fractions.
The rate of litter decomposition is 0.5, which is closely related to its chemical composition and C/N ratio. The sequence of the mineral contents in the litter is N>K>Ca>Mg>P> Mn>Fe>Na.
The litter in the forest of the Dinghu Mountain possesses more characteristice of tropical monsoon forest.
The study provides further evidence which can help classify the forest types.
出处
《土壤学报》
CAS
CSCD
北大核心
1993年第1期34-42,共9页
Acta Pedologica Sinica
关键词
凋落物
分解率
营养元素
森林
Litter
Rate of decomposition
Nutrient elements
