论文部分内容阅读
通过分析黄土高原古代自然植被景观和现代植被带的划分及目前人工林草生长情况,认为大于550mm降雨量地带易成林,乔木生长较好,可划为人工乔木带;在400～550mm降雨量地带乔木明显矮化,可划为矮化乔木、灌木带。黄土高原绝大部分地区可建立良好的植被。笔者根据目前保护较好的天然植被及已推广的人工植被盖度,并结合日人筑后(Chikugo)的方法和实地调查资料得出的回归方程推算,提出在自然条件下(无人为破坏)黄土高原森林地带植被盖度可达90%～100%,森林草原地带(400～500mm)可达80%以上。
By analyzing the division of the ancient natural vegetation landscape and the modern vegetation belt in the Loess Plateau and the present situation of the artificial grass growth, it is considered that the rainfall of more than 550mm is easy to grow and the trees grow well and can be classified as artificial arbor; Strip trees apparently dwarf, can be classified as dwarf trees, shrub belt. Most parts of the Loess Plateau can establish good vegetation. Based on the present well-protected natural vegetation and the popularized coverage of artificial vegetation and the regression equation derived from Chikugo’s method and field survey data, the author proposes that under natural conditions (no human damage) The coverage of vegetation in the forestlands of the Loess Plateau can reach 90% ~ 100%, and the forest prairie zone (400 ~ 500mm) can reach more than 80%.