CAJ | 학술논문

对宁夏盐池北部沙区典型农田防护林防风效能和阻沙效益的实地观测结果表明,小叶锦鸡儿(Caragana microphylla)灌木片林防护范围主要在林内和背风面距背风林缘0～3H(H表示树高)内,而背风面有效防护范围较小;沙柳(Salix psammophila)灌丛林带的迎风面和背风面风速均处于起沙风速(4.53 m·s-1)以上,对农田不能形成有效防护;榆树(Ulmus pumila)乔木林带残缺不全,严重影响防风效益.沙柳林带和榆树林带都是林带背风面大量积沙,未能有效地将风沙流中的来沙阻挡在农田以外;小叶锦鸡儿片林阻沙主要分布在林内,表明其能对农田形成有效防护.
대저하염지북부사구전형농전방호림방풍효능화조사효익적실지관측결과표명,소협금계인(Caragana microphylla)관목편림방호범위주요재림내화배풍면거배풍림연0～3H(H표시수고)내,이배풍면유효방호범위교소;사류(Salix psammophila)관총림대적영풍면화배풍면풍속균처우기사풍속(4.53 m·s-1)이상,대농전불능형성유효방호;유수(Ulmus pumila)교목림대잔결불전,엄중영향방풍효익.사류림대화유수림대도시림대배풍면대량적사,미능유효지장풍사류중적래사조당재농전이외;소협금계인편림조사주요분포재림내,표명기능대농전형성유효방호.
Field observation on effects of typical farmland shelterbelts in controlling wind and sand in the sandy land of Yanchi in Ningxia revealed that the shelterbelt of Caragana microphylla shrubberies provided shelter over the woodlot per se and 0-3H (H stands for height) at the leeway edge of the forest,with a limited effective range in the leeway;that the wind speeds at both windward side and leeward side of the shelterbelt of Salix psammophila were greater than the threshold velocity(4.53 m·s-1)of sand rising,so the shelterbelt gave little protection of the farmland;and that the fragmentary shelterbelt of Ulmus pumila,was unable to play its wind-breaking role.Sands accumulated on the leeway side of the latter two shelterbelts,indicating that they could not effectively prevent aeolian sands from coming into the farmland,while sands arrested inside the belts of Caragana microphylla,showing its effectiveness in controlling aeolian sands.