摘要
本文从养分吸收、归还和累积等方面综述了森林生态系统营养元素生物循环的某些研究成果;同时综合分析和讨论了调节养分循环的一般过程。系统的营养元索生物循环速率因树种和地理环境而异,一般表现为阔叶树高于针叶树,低纬地区高于高纬地区。在森林生产力上所表现出的类似规律性正是养分循环速率变化的反映。树体内养分的重新分配是一种普遍存在的现象,这些现象表示了树木对环境中营养元素供应不足的适应性反应。相比较而言,针叶林及高纬地区森林具有较高的养分利用效率。
Research results on the biological cycling of the nutrient elements in forest ecosystems were summarized, in which uptaking, returning and accumulating of nutrient elements were included. The general procedure of regulating nutrient cycling were also analysed and discussed in the paper. The rate of nutrient cycling changes with the forest types and geographical distribution. Generally, hardwood forests have higher cycling rate than coniferous forests, and those in low latitude zones have higher cycling rate than those in high latitude zones. The changes of forest productivity corresponds to the changes of nutrient cycling rates. Re-allocation of nutrient elements within trees is a common phenomenon, and it is an adaptive reaction of the tree to malehabitat. Moreover, coniferous forests and those in high latitude zones have higher efficiency in nutrient use.
出处
《林业科学研究》
CSCD
北大核心
1991年第4期435-440,共6页
Forest Research
关键词
森林
生态系统
营养元素
生物循环
forest ecosystems
nutrient elements
biological cycling
