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。
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 sand-fix 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.
出处
《水土保持通报》
CSCD
北大核心
2010年第1期117-120,共4页
Bulletin of Soil and Water Conservation
基金
中国科学院知识创新工程重大项目(KZCX1-YW-08-02-03)
国家重点基础研究计划(973计划)"干旱区绿洲化
荒漠化过程及其对人类活动
气候变化的响应与调控"(2009CB421308)
国家自然科学基金资助项目(40571015)
关键词
西北防护林
防风效能
距地高度
林带结构
粗糙度
northwest shelterbelt
effect of wind prevention
height from ground
structure
roughness
