浅谈森林采伐作业与环境保护

来源 :生物技术世界 | 被引量 : 0次 | 上传用户:jiesenbone23
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
森林对改善人们的生存环境起着重要的作用,因此在林业生产过程中应针对森林采伐作业方式、过程和集材对森林环境的影响,采取措施做好森林环境的保护工作,避免生态环境遭到破坏。 Forests play an important role in improving people’s living environment. Therefore, in the process of forestry production, forest environment should be protected against forest harvesting by means of operation, process and timber, and measures should be taken to protect the environment To destroy.
其他文献
吉尔130发动机的缸套由СЧ18-36铸铁制成,其硬度为HB178-229。主要的损伤形式是工作表面的拉伤和磨损。由于拉伤和磨损的程度不等,采用不同的修理方法。一 Jill 130 engin
A modified mathematical model based on the melting and recrystallization of an initial distribution of melting temperatures predicts the melting behavior of po
The modification of some metal complexes on Pt/Al2O3 clusters leads to remarkable increases in both the activity and the selectivity for meso-2,3-butanediol in
In this paper, (-amylase organized monolayer was assembled on the surface of the PET-CO2- substrate in different conditions. The different topography of the (-a
This paper is concerned with the numerical simulation of the transient effect of an inertialess Boger flow past aconfined circular cylinder and the comparison
CO2 adducts of L-(+)-asparaginic acid and some polyhydroxylated alkaloids was studied by 1HNMR and 13CNMR in this paper. CO2 adducts of L - (+) - asparaginic a
Objective To investigate the association between APOB gene R532W polymorphism and the risk of coronary heart disease(CHD)in patients without lipid-lowering trea
Objective To study the fatigue symptoms of adult patients with primary immune thrombocytopenia(ITP)and to analyze the possible factors that affect the severity
A kind of heteropoly compound film supported on Ce0.5Zr0.5O2 oxide was prepared on a porous titanium tube. The catalytic activity of the film for the selective
A series of aromatic imines were reduced to corresponding amines in excellent yields by 2-phenyl-N, N-dimethylbenzimidazoline (PDMBI) photochemically in the pre