【作者】 赵娜；

【导师】 胡春元；

【作者基本信息】 内蒙古农业大学 ， 水土保持与荒漠化防治， 2009， 硕士

【摘要】 沙地榆是白榆的一个变种,是浑善达克沙地主要的乔木树种,适生性强,在维持沙地生态系统的多样性和沙漠化土地治理方面具有非常重要的作用。为了解决沙地榆出现的生长衰退、更新困难等问题,作者于2008年夏秋之际,采用样带、样方、无样地等调查方法,以桑根达莱为中心,沿集通铁路方向对浑善达克沙地榆的分布、生长状况以及土壤养分进行了取样、调查和分析,在室内对192个土壤样品8个指标分析的基础上,采用SAS软件分析了沙地榆分布密度、生长状况与地形、地理位置、土壤养分、土壤pH值、土壤含水量等地面因子的相关关系。结果为:(1)4个立地类型上,按照沙地榆分布密度分析,背风坡>坡顶>迎风坡>丘间地;按照调查样带中分布的频度排序则为:丘间地>背风坡>迎风坡>坡顶;不同的地理位置上,中部区沙地榆分布较多,向东西两端逐渐减少;沙地榆的分布密度与草本植被种类、植被盖度、土壤水分、pH值、土壤全效养分的整体相关性较小,相关系数绝对值<0.5;沙地榆的3种分布状态(团聚、稀疏、零星)与土壤速效养分的关系为:团聚>稀疏>零星。(2)沙地榆的生长指标在不同立地类型上的排序为丘间地>背风坡>迎风坡>坡顶,并随地理位置由东向西逐渐增加;与草本的种类数的相关系数大部分在0.8以上;与草本盖度无相关关系;与土壤pH值的相关系数为0.71;与土壤中的全钾含量存在负相关关系,相关系数在-0.68左右;与土壤的其他养分指标以及土壤含水量无相关性。更多还原

【Abstract】 Ulmus pumila L.var.sabulosa is a variation of Ulmus pumila L. It is an indigenous plant in Otingdag Sand Land, they have better adaptability. They have every impotant effect in keep the ecosystem’s variety and father desertification. Recently years, Ulmus pumila L.var.sabulosa is growth wither and renewal difficulty. If we want to solve this problem, we should research connection between Ulmus pumila and environment in first. In Summer and Autumn 2008, author of this paper investigates distributing, growth of Ulmus pumila L.var.sabulosa and soil nutrient by sample belt, sanmple square and no sanmple. In room, it analyses 8 index of 192 soil samples. It analyses the correlation between distributing, growth of Ulmus pumila L.var.sabulosa and landform, gepgraphy station, soil nutrient, soil pH value, soil containing water or moisture by SAS software.Result is following facets.1) According to analyses distributing density of Ulmus pumila in different type of site condition, the result is the highest is sand dune leeward, second is sand dune peak, third is sand dune aweather, the last is flat between sand dunes. According to number and distributing frequency, the result is the highest is flat between sand dunes, second is sand dune leeward, third is sand dune aweather, the last is sand dune peak. According to different gepgraphy station, the most is middle part of Otingdag Sand Land. It is reduce gradually to east and west. The correlation is very small between distributing density of Ulmus pumila L.var.sabulosa and herbaceous species, herbage canopy , soil containing water or moisture, soil pH value, soil total nutrient. The correlation between Ulmus pumila L.var.sabulosa distribution and soil available nutrient is conglomeration distributing tiptop,second is sparsity distributing, last is single distributing.2) The correlation between Ulmus pumila growth index and type of site condition same as distributing density and type of site condition. Ulmus pumila growth indexs is increaseingly from east to west. The correlation is obvious between herbaceous species, soil pH value and Ulmus pumila growth index. Ulmus pumila growth indexs and soil total potassium values, herbage canopy is negative correlation. Soil containing water or moisture, soil total nutrient except total potassium and Ulmus pumila growth indexs is no correlation.更多还原