论文部分内容阅读
通过对毛乌素流动沙丘栽植１４年生樟子松、油松人工林的测定结果表明，与无林裸沙地段相比小气候变化极为明显，相对湿度增高，地表温差缩小，风速降低，蒸发量也下降；林地内土壤的养分含量，细粒物质都有了较大幅度的增高，土壤表面出现了明显的结皮，且有了层次的发育，在林地表面，出现了苔藓和地衣。沙地樟子松、油松的综合生态效益指数可达４９．９％；经济效益差距较大，樟子松人工林每公顷木材总产值为３３６００元，而油松木材总产值为５７１５元，说明樟子松是毛乌素流动沙区经济价值和生态效益均表现优良的针叶树种。
The result of Pinus tabulaeformis plantation planted by flowering sand dune in Maowusu shows that the microclimate change is obvious compared with the forestless bare sand land, the relative humidity increases, the surface temperature difference decreases, the wind speed decreases and the evaporation decreases. The content of soil nutrients and fine-grained substances in forest land increased greatly, and obvious crusts appeared on the surface of soil, and there was a level of development. On the surface of forest land, moss and lichen appeared. The integrated ecological benefit index of Pinus sylvestris var. Mongolica and Pinus tabulaeformis in sandy land is up to 49.9%. The difference of economic benefits is larger. The total output value of timber per hectare in Pinus sylvestris var. Mongolica is 33,600 yuan, while that of Pinus tabulaeformis wood is 5,715 yuan, It shows that Pinus sylvestris is the coniferous species with excellent economic value and ecological benefits in the Mu Usuang sandy area.