ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

    高级检索

    塔里木盆地东北缘绿洲区土壤养分特征及主控因素分析

    Soil Nutrient Characteristics and Main Controlling Factors in the Oasis Zone of the Northeastern Margin of Tarim Basin

    • 摘要: 土壤健康关系人民生产生活水平,关乎国家粮食安全,是重要的战略资源。为摸清塔里木盆地东北缘典型绿洲区土壤养分特征,采集研究区土壤表层样品140件,测定主要养分元素含量,分析其生态化学计量特征、空间分布规律及影响养分富集的主控因素。结果表明:① 研究区Fe、Mn含量高值分布面积最广,Mg含量高值分布范围最小;分析土壤生态化学计量特征,发现缺氮少磷是限制区内植物正常生长的主控因素。②从数量上来看,研究区贫瘠、极贫瘠级别的土地面积占总面积的99.14%,仅0.86%的土地处于中等级别水平。从空间分布上来看,中等肥力的土地分布在区内东南部,呈孤岛状;极贫瘠的土地主要分布在绿洲–荒漠的过渡带上。③研究区4种土地利用方式中,耕地的土壤养分含量较高;土壤养分元素的含量与坡向、地表粗糙度呈正相关关系,与海拔呈负相关关系。同时,土壤养分的丰缺与长期连作、作物施肥、灌溉技术等人为影响也有着密切的关系。

       

      Abstract: Soil health is related to people’s production, living standards, and national food security and is an important strategic resource. To understand the nutrient characteristics of soils in typical oasis areas on the northeast edge of the Tarim basin. A total of 140 soil surface samples were collected from the study area to determine the content of major nutrient elements and analyze their ecological chemometric characteristics, spatial distribution patterns, and the main controlling factors affecting nutrient enrichment. The results showed that: ① High values of Fe and Mn were most widely distributed in the study area, while high values of Mg were the least widely distributed. Analysis of the ecological stoichiometric characteristics of the soil showed that the lack of nitrogen and phosphorus was the main controlling factor limiting the normal growth of plants in the area. ② In terms of quantity, 99.14% of the total land area in the study area is infertile or very infertile, and only 0.86% of the land is at the medium−grade level. In terms of spatial distribution, the moderately fertile land is distributed in the south−eastern part of the district in the form of islands, and the very barren land is mainly distributed in the oasis−desert transition zone. ③ Among the four types of land use, the soil nutrient content of the arable land is higher. Meanwhile, the content of nutrient elements is positively correlated with slope orientation and surface roughness and negatively correlated with altitude. At the same time, the abundance of soil nutrients is also closely related to long−term continuous cropping, crop fertilization, irrigation techniques, and other anthropogenic influences.

       

    /

    返回文章
    返回