| 我国三北地区的植物固沙 |
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| 引用本文： | 刘媖心.我国三北地区的植物固沙[J].中国沙漠,1988,8(4):11-18. |
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| 作者姓名： | 刘媖心 |
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| 作者单位： | 中国科学院兰州沙漠研究所 |
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| 摘 要： | 本文提出三北地区影响植物固沙的自然特征, 论述了机械固沙、灌溉与植物固沙的关系, 植被盖度与栽植密度的关系, 人工植被演替及其控制, 植物固沙的指标、固沙植物种的选择与配置, 固沙植物的引种及其限制因子, 并按等雨量线将植物固沙划分为四个区。
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Phyto-reclamation of Sand Dunes in Northwest,North and Northeast of China |
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| Liu Yingxin.Phyto-reclamation of Sand Dunes in Northwest,North and Northeast of China[J].Journal of Desert Research,1988,8(4):11-18. |
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| Authors: | Liu Yingxin |
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| Institution: | Institute of Desert Research, Academia Sinica |
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| Abstract: | 1) The measures and types of phyt reclamation are closely related to the precepitation. It may be divided into four divisions according to the isolines of rainfall in Northeast, North and North-west in China. a) Sandy lands with rainfall more than 400 mm is "tree-shrub-subshrub" division. b) Sandy deserts with rainfall 400-250 mm is "shrub-subshrub" division. c) Sandy deserts with rainfall 250-200 mm is "mixed mechanical and vegetation measures" divisioo. d) Sandy deserts with rainfall less than 200 mm is"irrigation sand* division. 2) The maximum cover-degree of artificial vegetation can be obtained are variable according to the Precipitation, and are comparable with the natural vegetation. If we want tke Plant cover of the artificial vegetation to be greater than that of the natural maximum coverage, it is no use to increase the density of fixators. 3) The aim of phyto-reclamation is to establish effective and stable vegetation, but it can never be unchangeable, because there is also plant succession in artificial vegetation. So we should take measures to meet the demand of mankind. Such as in the mature forest of pinus sylvestris var. mongolica, we can thin it to decrease the water competition. Under the association of Artemisia ordosica in the luxuriantly stage, we may break the biotic crust and let the rain Permeate into the sand and the seeds sprout. 4) The criterion for judging phyto-reclamation is not only the cover-degree of fixators, but also the thickness and area of the biotic crust, and the composition of growth forms of psammophytes and how the cover-degree approaching that of natural vegetation in the later stage. 5) The selection of fixators should be according to the zonality. The arrangement of fixators should consider the characteristic of the growth form, type and depth of root, stage of succescion and ecological sere. 6) Temperature does not affect the introduction of fixators at home, but zonality may have considerable significance to the introduction. Temperature is a limit factor affecting the introduction of species from abroad. |
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