Study on Windproof Effect of Pinus sylvestris var.mongolica Farmland Shelterbelt Based on Wind Tunnel Test
Pinus sylvestris var.mongolica,one of the main afforestation tree species in the"Three Norths"region of China,has strong windbreak and sand fixation ability.In this study,Pinus sylvestris var.mongolica shelterbelt was taken as the research object.The wind tunnel experiments were carried out on the windbreak benefit of five shelter-belts,and the wind speed and flow field characteristics of different distances in the shelterbelt protection areas with different configurations were determined.The relationship between the configuration of different row zones and the protection benefit of Pinus sylvestris var.mongolica shelterbelt was studied,which provided a theoretical basis for the construction of evergreen coniferous tree species in farmland shelterbelt.The results show that:(1)The wind-break effect increased with the increase of the number of rows in the forest belt,and the wind speed decreased sig-nificantly within 1 H-3 H after the forest belt,forming a wind shadow area,and the area of the wind shadow area increased with the increase of the number of rows in the forest belt.(2)The wind speed and flow field of Pinus syl-vestris var.mongolica changed significantly after the shelterbelt.Under the condition of 12 m.s-1 wind speed,the windproof efficiency of the five forest belts in 1-5 rows and 1 belt was 15.1%,26.2%,37.5%,51.7%and 51.9%,respectively,and the windproof efficiency of the 4 rows and 1 belt、5 rows and 1 belt structure configuration was more than 50.0%.(3)Pinus sylvestris var.mongolica shelterbelt has a strong windbreak effect.It is suggested that Pinus sylvestris var.mongolica can be used for afforestation in the construction and renewal of farmland shelterbelts in arid areas,and the optimal structure configuration is 4 rows and 1 belt.
Pinus sylvestris var.mongolicafarmland shelterbeltwind tunnel testforest belt structure
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