论文部分内容阅读
通过对磴口绿洲11条农田防护林带结构参数调查和防护效益观测,得出不同林带结构模式下的防护效益。并指出树高与胁地影响关系最为密切,其回归方程为T=3.3434HG0.7669。又以主要造林树种新疆杨、二白杨为例,建立了单树冠不同径级的蓄积量和树高的增长模式,结合木材市场和实地调查得到木材价格与农作物产值,在保证防护效益的基础上,进行林带木材经济效益与胁地负效益综合评价,为防护林林带结构设计、防护林效益综合评价、林权改革提供了参考依据。
Through the investigation of the structural parameters of 11 farmland shelter belts and the observation of the protective benefits in the oasis in Qiaokou, the protective effectiveness under different shelterbelts was obtained. It is pointed out that the relationship between tree height and threatening land is the most closely related. The regression equation is T = 3.3434HG0.7669. Taking the main afforestation species of Xinjiang poplar and Populus euphratica as examples, this paper established the growth pattern of the accumulation volume and the tree height of different diameter classes of single crown, combined with the timber market and field surveys, the price of timber and the output value of crops were obtained. On the basis of ensuring the protection efficiency , Timber forest economic benefits and negative comprehensive assessment of threatening effect for the shelterbelt structure design, comprehensive evaluation of the benefits of shelterbelts, forest rights reform provides a reference.