Tree Productivity and Water Potential Productivity in Returning Farmland to Forest Project in Datong County, Qinghai Province

编号 zgly0000340727

文献类型 期刊论文

文献题名 Tree Productivity and Water Potential Productivity in Returning Farmland to Forest Project in Datong County, Qinghai Province

学科分类 220.1040;森林土壤学

作者 YinJing  LiuChenfeng  ZhaoWanqi  HeKangning 

作者单位 CollegeofSoilandWaterConservation  BeijingForestryUniversity  Beijing100083  P.R.China  QinghaiProvinceForestTourismBureau  Datong  Qinghai  810100  P.R.China 

母体文献 Forestry Studies in China;中国林学: 英文版 

年卷期 2004,6(3)

页码 36-42

年份 2004 

分类号 S157  S718.5 

关键词 退耕还林  青海  水分  树木  生产率 

文摘内容 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 hm^2 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 hm^2 can serve as potential productivitystandard of actual biomass of arbor established forest. In sub-humid area, Thomthwaite Model is adopted to estimate plant climate potential productivity, which is about 8 462 kg'hm^-2a^-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 19.09kg·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 hm^2 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。