Effects of Wind Prevention by the Northwest Shelterbelt

DU He-qiang; HAN Zhi-wen; YAN Chang-zhen; DENG Xiao-hong; SONG Xiang; LIAO Jie

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Effects of Wind Prevention by the Northwest Shelterbelt

- Effects of Wind Prevention by the Northwest Shelterbelt
- Bulletin of Soiland Water Conservation Vol. 29, Issue 1, Pages: 117-120(2010)
- 作者机构：
  
  中国科学院寒区旱区环境与工程研究所中国科学院沙漠与沙漠化重点实验室,甘肃,兰州,730000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2010
- 稿件说明：
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DU He-qiang, HAN Zhi-wen, YAN Chang-zhen, et al. Effects of Wind Prevention by the Northwest Shelterbelt[J]. Bulletin of Soiland Water Conservation, 2010, 29(1): 117-120.
DOI：

DU He-qiang, HAN Zhi-wen, YAN Chang-zhen, et al. Effects of Wind Prevention by the Northwest Shelterbelt[J]. Bulletin of Soiland Water Conservation, 2010, 29(1): 117-120. DOI：

摘要

风沙灾害是中国西北地区普遍存在自然灾害之一。为探查西北防护林的防风效能

选取甘肃民勤和宁夏盐池2个典型的风沙灾害区

采用样地调查、统计分析、回归模型等方法

对农田片状林不同距地高度和不同疏透度在有效距离内的防风效能进行观测与分析

并对防风固沙林对地表粗糙度的影响进行了研究。结果表明

在防护林树冠以下有效防风距离内

随距地高度的增加防风效能逐渐增加;防护林的疏透度与其防风效能呈极显著负相关

相关系数达-0.941;防风固沙林随其郁闭度的增加

地面粗糙度逐渐增大

并给出防护林郁闭度和地面粗糙度之间的函数关系式。并且对产生这些结果的原因进行了初步的讨论。

Abstract

Wind-sand hazard is a common natural disaster in northwest region of China.Minqin

Gansu Province and Yanchi

Ningxia Province

which are the typical areas of wind erosion

were selected to investigate wind prevention by the northwest shelterbelt.The wind prevention of the schistose shelterbelt in farmland with different heights from ground and in different structures were observed and moreover

the windbreak and sand-fix forest that may influence ground roughness were studied.The methods of sample area survey

statistical analysis

and regression model were used in the investigation.We found that the wind prevention of shelterbelt increased along with raising height from ground in valid windbreak distance ; the degree of porosity belt with its wind prevention presented a very significant negative correlation and the related coefficient was 0.941 ; and ground roughness increased with the raising crown density of windbreak and sand2fix forest.Moreover

the function of ground roughness and the crown density of forest was given.Some simple discussions were made according to the above mentioned results.

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