摘要
对株行距分别为2m×4m、3m×4m、4m×4m、5m×4m、6m×4m的5种林分密度银中杨人工林的生物量及营养元素吸收积累量进行了测定,同时分析探讨了不同林分密度银中杨的叶面积．光能利用率。研究结果表明,8年生银中杨人工林生物量为45．8～89．1t／hm2；林分生物量与林分密度正相关,林分密度不同则生物量在各器官的分布比例不同,林分密度大的林分干材所占的比例较林分密度小的高。平均净生长量为6．6～13．1t／（hm2·a），干材的生产力最高,叶次之。叶面积指数均在2．4以上,高达4．2,与林分密度呈正相关。银中杨每生产1t生物量需从土壤中吸收22．6kg营养元素；叶片中营养元素积累的速率明显高于其它器官,枝次之,枯枝落叶在林分养分循环中起重要作用。
The biomass and nutrient accumulations of Populus alba×P. berolinensis plantations,whose intrarow spaces are 2. 3,4. 5, 6, and the interrow spaces are all 4m,were determined,and the foliage areas and light energy utilization rates of different density Populus alba×P. berolinensis were also discussed. The results show that at the 8th year, the stand biomass ranges from 45. 8 to 89.1 t·hm-2, stand biomass is positively correlated to densities; the biomass allocations differ in all parts for different density stand.The main stem biomass of stand with bigger densities are higher,the average net growth ranges from 6. 6 to 13. 1t·hm-2·a-1, and the trunk's productivity is the highest and the foliage is the next; leaf area index ranges from 2. 4 to 4. 2,which is positively correlated to density. The stand absorbs 22. 6 kg of nutritive element from soil for one ton biomass,the accumulation rate of nutritive element in foliage is distinctly higher than others,and the branch is the next; litter plays an important role in nutritive element cycle.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1999年第3期31-35,共5页
Journal of Northeast Forestry University
关键词
银中杨
林分密度
生物量
营养元素
分布规律
Populus alba×P. berolinensis
Stand density
Biomass
Nutritive element
