论文部分内容阅读
一、概述一些发达的国家很早就应用立地指数来定量地评价立地质量,预测林分的生产力。近年来,我国也有一些这方面的报道。不论是国外还是国内,大多数是从生产力角度考虑的,而很少从造林林种设计和树种选择的角度来应用立地指数评价立地质量。特别是在干旱地区,就更缺少这方面的研究。为了科学地评价立地质量,从而选择适当的造林树种和合理安排林种,我们从生产需要出发,在四子王旗的山地、丘陵和高原的榆树纯林中,选择了36块未遭人畜破坏的标准地,
I. Overview Some developed countries have long used the site index to quantitatively assess the site quality and forecast the productivity of stand. In recent years, there are some reports in this area in our country. Most of them are considered from the perspective of productivity, both abroad and domestically. However, the site index is rarely used to evaluate the site quality from the standpoint of plantation design and tree species selection. Especially in arid areas, there is even a lack of research in this area. In order to scientifically evaluate the site quality, select the suitable tree species for afforestation and arrange the forest species rationally, we selected 36 standard plots that were not damaged by livestock and livestock in the pure forests of the elm trees in the mountains, hills and plateaus of the Siziwang Banner ,