文献类型：期刊文献

中文题名：基于数学期望的风向和风速对农田防护林网防风效能的影响

英文题名：Influence of Wind Direction and Speed on the Windbreak Efficiency of Farmland Shelterbelt Networks Based on Mathematical Expectation

作者：张帅[1,2] 丁国栋[1,2] 高广磊[1,2] 赵媛媛[1,2] 包岩峰[3] 于明含[1,2]

第一作者：张帅

机构：[1]北京林业大学水土保持国家林业局重点实验室,北京100083;[2]北京林业大学水土保持学院,宁夏盐池毛乌素沙地生态系统国家定位观测研究站,北京100083;[3]中国林业科学研究院荒漠化研究所,北京100091

年份：2018

卷号：57

期号：4

起止页码：510-516

中文期刊名：厦门大学学报：自然科学版

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金(31270749,31600581); 中央高校基本科研业务费专项(2015ZCQ-SB-02)

语种：中文

中文关键词：防护林;风速流场;防风效能;数学期望

外文关键词：shelterbelt;wind velocity flow field;windbreak efficiency;mathematical expectation

分类号：S727.24

摘要：为研究农田防护林网在全年的时间尺度上对不同方向有害风的综合防护效能,在野外实地观测不同风向(与主林带夹角分别为90.0°,67.5°,45.0°,22.5°和0°)和风速(5.2和7.3m/s)条件下的林网内防风效能,根据各风向有害风发生频率计算数学期望值,利用克里金(Kriging)插值法进行模拟,并用地统计学的方法分析防护林网的空间自相关性.结果表明:防护林对不同风向的风均有较强的防护作用,随着风向与主林带夹角的减小,平均风速呈现出增大的趋势,防风效能分别达到69.5%,66.2%,60.4%,59.8%和50.1%;不同风速条件下防风效能均达到50%以上,低风速和高风速时平均有效防护面积分别为90.1%和44.0%;不同风速条件下林网内空间变异系数分别与指数模型和高斯模型相拟合,林带内风速块金值较低,变程较大,具有强烈的空间自相关性和样本区间的合理性.
In order to study the comprehensive protective benefits of farmland shelterbelt networks against harmful winds in different directions throughout a year,different wind directions（the angles to the main forest belt were 90.0°,67.5°,45.0°,22.5°,and 0°,respectively）and speeds（5.2 and 7.3 m/s）were observed in the field.The mathematical expectation values were calculated according to the occurrence frequency of the wind at each wind direction,simulated by Kriging interpolation,and the spatial autocorrelation of shelterbelt networks was analyzed using geostatistics.The results showed as following：1）Shelterbelt had a strong protective effect under winds of different directions.With a decrease in the angle between the wind direction and the main forest belt,the mean wind speed showed an increasing trend,and the windbreak efficiency reached 69.5%,66.2%,60.4%,59.8% and 50.1%,respectively.2）Windbreak efficiency under different speeds can reach more than 50%.The average effective protection area under low wind speed can reach 90.1%,while under high wind speed it is 44.0%.3）The spatial variability coefficients of the shelterbelt under different wind speed conditions can be fitted with an exponential model and a Gaussian model.The shelterbelt nugget of the wind was lower,its range was larger,and it had a strong spatial autocorrelation and rationality of the sample interval.