塔里木河中游荒漠河岸林土壤理化性质分布特征与植被关系

发布时间：2018-03-08 22:08

本文选题：荒漠河岸林　切入点：土壤理化性质　出处：《水土保持研究》2016年02期 　论文类型：期刊论文

【摘要】：为揭示土壤理化性质的空间变异特征及其与植物数量特征、物种多样性的关系,运用相关性分析和回归分析等方法对塔里木河中游荒漠河岸林不同生境土壤理化性质的空间变异规律及其与植物数量特征和物种多样性进行了分析。结果表明:(1)不同生境土壤理化性质有明显的差异,表现为:土壤含水量、容重在河岸地带大于过渡地带和荒漠地带,持水量、孔隙度、全盐、pH值则随着垂直于河岸距离的增加而增加,有机质、全磷、全钾的最大值则出现在水热资源组合较好的过渡地带,生境内部不同土层理化因子变化呈现不同的规律;(2)随着距离河岸增加,乔木、灌木、草本的频度、盖度、密度存在不同程度退化,物种多样性指数也明显降低;(3)植物数量特征、物种多样性指数与土壤理化因子存在一定的相关性,全盐量、容重、土壤含水量、pH、全氮、全磷与植物的数量特征指标和物种多样性指数的关系最为密切;(4)经回归分析,表明土壤含水量是影响干旱地区植物生长的首要因子,而土壤养分也是影响植物生长的主要因素,且有机质、全磷、全钾与植物生长状况呈负相关。土壤理化性质的空间变异不仅促使区域植物数量特征发生明显变化,而且也影响群落的演替,同时,植物的空间分布特征对土壤理化性质有明显改良作用,通过二者关系的研究为塔里木河中游荒漠河岸林的恢复和土地沙化的治理提供理论支撑。
[Abstract]:In order to reveal the spatial variation characteristics of soil physical and chemical properties and their relationship with plant quantity and species diversity, The spatial variation of soil physical and chemical properties of desert riparian forest in the middle reaches of Tarim River and its relationship with plant quantity and species diversity were analyzed by means of correlation analysis and regression analysis. The physical and chemical properties of soil in different habitats were obviously different. Soil water content, bulk density in riparian zone is larger than that in transition zone and desert zone, water holding capacity, porosity, pH value of total salt increase with the increase of distance perpendicular to riverbank, organic matter, total phosphorus, The maximum value of total potassium appeared in the transition zone where the combination of water and heat resources was better. The physical and chemical factors of different soil layers in the habitat showed different laws. (2) the frequency and coverage of trees, shrubs and herbs increased with the distance from the river bank. The densities degenerated to different degrees, and the species diversity index also decreased significantly. The species diversity index was correlated with soil physical and chemical factors, total salt content, bulk density, soil water content and pH value, total nitrogen, total nitrogen, total salt content, soil water content, soil water content, total nitrogen, total salt content, soil water content, total nitrogen. The regression analysis showed that soil water content was the primary factor affecting plant growth in arid areas, and soil nutrients were also the main factors affecting plant growth. The spatial variation of soil physical and chemical properties not only promoted the change of regional plant quantity, but also affected the succession of community. The spatial distribution of plants has a significant effect on the improvement of soil physical and chemical properties. The study of the relationship between the two provides theoretical support for the restoration of desert riparian forest and the management of land desertification in the middle reaches of Tarim River.
【作者单位】：新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室;新疆塔里木大学植物科学学院;
【基金】：973计划前期研究专项资助项目(2012CB723204) 国家自然科学基金资助项目(31360109) 兵团博士资金资助项目(2008JC15)
【分类号】：S714.2

【共引文献】