草牧场防护林对积雪厚度的影响  

The Influence of Protection Forest on the Thickness of Accumulated Snow on Grassland

作　　者：吴德东[1] 袁春良[1] 吕明海[2] 石素英 

机构地区：[1]辽宁省固沙造林研究所,辽宁阜新123000 [2]辽宁工程技术大学,辽宁阜新123000

出　　处：《林业科学研究》2000年第3期328-332,共5页Forest Research

基　　金：国家"八五"攻关!"草牧场防护林营建技术研究"内容

摘　　要：The thickness of snow accumulated near different kinds of protection forest, i.e. shelterbelt ( Pinus sylvestris var. mongolica ) with ventilation structure, grouped protection forest ( P. sylvestris var. mongolica ) with closed structure, and the protection forest ( Lespedeza bicolor ) with loose structure, at Baiyinhua Sand in Fuxin of Liaoning Province were measured. The shape of snow drift on the windward side and leeward side near shelterbelt was long and thin, and distributed evenly. The farther the snow drift away from the shelterbelt, the more even it distributed. The grouped protection forest had the thickest snow accumulated (30.5 cm) on the forest edge on the windward side, but distributed unevenly. The snow accumulated on the edge of leeward side of protection forest with loose structure was 15.8 cm in thickness, and the snow in the forest was thicker than the average. Grouped protection had the greatest influence on the thickness of snow accumulated, followed by the forest with loose structure, and the shelterbelt the least. The effective distance of snow accumulation on lee side was longer (84 m at its maximum) than on windward side (42 m at its maximum). Mathematical equations were established by regression analysis to forecast the thickness of snow at different distances away from the forests.The thickness of snow accumulated near different kinds of protection forest, i.e. shelterbelt ( Pinus sylvestris var. mongolica ) with ventilation structure, grouped protection forest ( P. sylvestris var. mongolica ) with closed structure, and the protection forest ( Lespedeza bicolor ) with loose structure, at Baiyinhua Sand in Fuxin of Liaoning Province were measured. The shape of snow drift on the windward side and leeward side near shelterbelt was long and thin, and distributed evenly. The farther the snow drift away from the shelterbelt, the more even it distributed. The grouped protection forest had the thickest snow accumulated (30.5 cm) on the forest edge on the windward side, but distributed unevenly. The snow accumulated on the edge of leeward side of protection forest with loose structure was 15.8 cm in thickness, and the snow in the forest was thicker than the average. Grouped protection had the greatest influence on the thickness of snow accumulated, followed by the forest with loose structure, and the shelterbelt the least. The effective distance of snow accumulation on lee side was longer (84 m at its maximum) than on windward side (42 m at its maximum). Mathematical equations were established by regression analysis to forecast the thickness of snow at different distances away from the forests.

关 键 词：草牧场 防护林 樟子松 胡枝子 积雪厚度 草场 

分 类 号：S727.250.5[农业科学—林木遗传育种]