首页 | 本学科首页   官方微博 | 高级检索  
     


Tree productivity and water potential productivity in returning farmland to forest project in Datong County,Qinghai Province
Authors:Yin?Jing,Liu?Chenfeng,Zhao?Wanqi,He?Kangning?  author-information"  >  author-information__contact u-icon-before"  >  mailto:hkn@bjfu.edu.cn"   title="  hkn@bjfu.edu.cn"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author
Affiliation:1. College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, P. R. China
2. Qinghai Province Forest Tourism Bureau, Datong, Qinghai, 810100, P. R. China
Abstract:From 2002 to 2003, based on the investigation of sample plots and stem analysis of remained plantation communities in the areas of returning farmland to forest in the 1980s in Datong County, Qinghai Province, this paper studies tree productivity and moisture potential productivity of six types of plantations on the land of returning farmland to forest, such as green poplar (Populus cathayana Rehd.) and shrub mixed forest, Asia white birch (Betula platyphylla) and China spruce (Picea asperata) mixed forest, Dahurian larch (Larix gmelinii) pure forest, China spruce pure forest and Asia white birch pure forest and so on. The results show that: in sub-humid region of Loess Plateau, 3 000 trees per hm2 is a proper standard of planting density. Under current condition, the productivity index of green poplar and shrub mixed forest, Asia white birch pure forest, China spruce pure forest, and Asia white birch and China spruce mixed forest with the density of 2 100-3 333 trees per hm2 can serve as potential productivity standard of actual biomass of arbor established forest. In sub-humid area, Thornthwaite Model is adopted to estimate plant climate potential productivity, which is about 8 462 kg·hm−2·a−1. The actual potential water productive efficiency of Purplecone spruce (Picea purpurea) and Asia white birch pure established forest are 17.22 and 22.14 kg·mm−1·hm−2·a−1 respectively, and that of green poplar and shrub mixed established forest, and Asia white birch and China spruce mixed established forest are 21.14 and 19.09 kg·mm−1·hm−2·a−1 respectively. The potential productivity of green poplar and shrub mixed forest, Asia white birch and China spruce mixed forest, China spruce pure forest and Asia white birch pure forest which have grown into forest with the density of 3 000 trees per hm2 have attained or been close to that of local climax community, which is local maximum tree productivity at present. These types of forestation models are the developing direction of the returning farmland to forest project. [Supported by the National Natural Science Foundation of China (Grant No.30371172) and the Tenth “Five-year Plan” National Key Projects in Science and Technology of China (Grant No. 2001BA510B0102)]
Keywords:returning farmland to forest   tree productivity   water potential productivity
本文献已被 CNKI 万方数据 SpringerLink 等数据库收录!
点击此处可从《中国林学(英文版)》浏览原始摘要信息
点击此处可从《中国林学(英文版)》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号