橡胶树速生种质资源年生长动态分析

以2 159份橡胶树种质资源为基础,于2009-2017年逐年对其年径围生长量进行测量,选出速生种质资源56份,分析其年生长动态规律,为速生种质资源早期选择提供理论指导。结果表明,选出的速生种质资源的9年生径围总生长量均值为68.23 cm,是总群体均值55.30 cm的1.23倍,但入选速生群体内部的年生长动态呈现较大差异性,通过聚类分析可以清晰地将每一类区分开。建议在对速生种质资源进行生长早期选择时,选择年龄以5龄为宜,入选率控制在总群体的12%左右,可使速生资源的选择正确率达到90%。

Elasticity Ratio of Resource Consumption and the Resource Consumption

Today the resources are becoming scarcer, which should not be regarded as unexhausted any more. Correspondingly, the production would be constrained by the scarcity of resources clearly. Then the economic researchers would pay much more attention to reducing the consumption of natural resources in the future. Therefore this paper brings foreword the conception of elasticity ratio of resource consumption based on the concept of elasticity and analyzes the relationship between the parameters. For the certain relationships between the elasticity ratio of resource consumption and resource consumption, this paper will try to reveal, to keep economy growing while resource consumption reducing, what conditions should be met as to the relationships among resource productivity, its growth rate, energy saving efficiency, economic growth rate and elasticity ratio of resource consumption. This paper proves the relationship between the China＇s energy consumption and economy growth using statistic data from 1978 to 2003.

“中国木材工业可持续发展高层论坛”将在北京举办

中国林业机械协会与南京林业大学木材工业学院、中国林业科学研究院木材工业研究所、中国绿色时报社定于2004年3月“第十届国际木工机械及家具生产设备展览会”期间在北京共同主办“中国木材工业可持续发展高层论坛”。 木材是当今世界四大材料中唯一可再生和再循环利用的绿色材料和生物资源,木材工业在我国国民经济中占有重要地位。实现中国木材工业的可持续发展,对于推进我国社会主义现代化建设步伐,全面建设小康社会至关重要。举办“