摘要
以我国南方亚热带杉木人工林为对象,在实测林分养分元素的输入、输出及生物循环的基础上,建立了动态数学模型,并进行了动态模拟分析。结果表明,养分元素在系统内周转的快慢,直接影响着林木的生长,主要营养元素的循环速率依次为N>K>p;对林分施肥,不仅表现为土壤养分贮存量增加,而且使N,p,K的循环速率相应提高;在强度间伐(50%)措施下,N,p,K的循环速率降低,系统内的平衡遭到破坏。
On the basis of the determination of the input, output and biologcal cycle of nutrient element in the subtropical Chinese fir plantations in South China, a dynamic mathematical model has been developed, and dynamic simulation analysis carried out. The results indicate that the speed of nutrient element cycling in the system directly affects the growth of the forest trees. In the order of cycling rate of the main nutrient elements: N is the highest, followed by K, P, respectively. Forest fertilization not only increases the soil nutrients, but also speeds up the cycling rate of N, K, P. When heavy thinning (50%) is practised, the cycling rate of N, P, K decreases, and the system equilibrium is deteriorated.
出处
《中南林学院学报》
CSCD
1990年第2期155-164,共10页
Journal of Central South Forestry University
关键词
杉木林
氮
磷
钾
动态模拟分析
simulation anlysis, nutrient cycle, cycling rate, dynamic mathematical model
