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1986年我们选择和田县以杨树为主体的护田林带,采用正交试验设计的模糊分析法探讨其防护效益。根据试点现有的林带组合类型,选了林带结构特征中最基本的四个因素,即树种组成、株行距密度、行数(宽度)、带高。每个因素均选三个水平,安排于正交表L_9(3_4)中,然后现场实测这9种组合类型的林带后10H范围内的总防风效能。每一组合类型重复实测5次,求出每次测试的总防风效能,后取5次重复的平均值,按正交试验设计的模糊分析已得出初步结果:
In 1986, we selected poplar-dominated forest belt in Hotan County, and studied its protective effectiveness by using the fuzzy analysis method of orthogonal experimental design. According to the existing forest type combinations in the pilot, the four most basic factors in the structural characteristics of the forest belt were selected, namely species composition, row spacing density, row number (width) and belt height. Each factor was selected three levels, arranged in the orthogonal table L_9 (3_4), and then measured the total windbreak performance 10H range after the 9 types of forest belt. Each combination of type repeated measured 5 times, find the total windproof performance of each test, after taking 5 times the average of the repeated, according to the orthogonal design of the fuzzy analysis has yielded preliminary results: