Wu Qinxiao,Liu Xiangdong,Zhao Hongyan.A STUDY ON DYNAMICS OF LITTER AMOUNT IN FOREST STANDS OF CHINESE PINE AND MOUNTAIN POPLAR[J].Research of Soil and Water Conservation,1991,(02):51-56.
油松、山杨林枯枝落叶层蓄积动态的研究
- Title:
- A STUDY ON DYNAMICS OF LITTER AMOUNT IN FOREST STANDS OF CHINESE PINE AND MOUNTAIN POPLAR
- Keywords:
- Pinus tabulaeformis; Populus davidiana; litter
- 摘要:
- 流域坡面上的枯枝落叶只有达到一定厚度，才能防止水土流失。本文从动态的角度，对陕北黄土丘陵区的主要森林类型油松和山杨林的枯枝落叶层的蓄积进行了研究，结果表明，中龄油松和山杨林的现存蓄积量分别为17.95t/ha和8.34t/ha；年凋落量为3.24t/ha和3.09t/ha，油松林的凋落主要发生在10月至翌年4月，山杨林则集中在9、10两月；年分解量为3.23t/ha和2.89t/ha，其中夏季分解快，冬季分解慢。根据林分枯落物现存蓄积量、凋落量和分解量阐明的蓄积动态表明，油松枯落物蓄积以4月为最多，10月最少，山杨则以1月最多，8月最少。在目前的年龄和结构状态下，凋落量和分解量基本呈平衡状态，枯落物蓄积量无明显增减。
- Abstract:
- Only by reaching a fairly deep thickness of litter on the slopes of watershed, can the soil and water loss be averted. This paper from dynamic angles examined the litter amount in forest stands of Pinus tabulaeformis and Populus davidiana of middle age in loess hilly region of northern Shaanxi. The results of the study showed that the per factor existing litter amount in both above-mentioned stands is 17.95t. and 8.34t., respectively, and the annual litter fall is 3.24t. and 3.09t. correspondingly. The litter fall in P. tabulaeformis stand occurs meanly from October to April of next year after growing season, and in P.davidiana stand-in September and October with concentration. The annual litter decomposition in both stands is determined as 3.23t./ha and 2.89t./ha,and it is going more quickly in summer and more slowly in winter. According to the dynamic changes of litter on the basis of its existing amount, annuel fall and decomposition, the maximum litter amount in year for P. tabulaeformis stand may be observed in April, and the minimum-in October. The same as for P. davidiana stand they are in January and August, respectively. At the present conditions of stand age and structure, the litterfall and decomposition are in balance. There are not obvious changes in litter amount.
参考文献/References:
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基金项目:国家自然科学基金