南疆绿洲-荒漠过渡带“肥岛”的养分特征分析
发布时间：2018-08-20 20:07
【摘要】：【目的】为了分析和检验塔克拉玛干沙漠边缘绿洲-荒漠中灌木"肥岛"效应对荒漠土壤肥力的作用强度。【方法】采用野外取样和室内实验分析相结合的方法,测定了胡杨(Populos euphraticu)灌丛林及周边过渡带中不同深度土壤养分含量;通过计算富集率和构建土壤肥力指数模型评价南疆绿洲-荒漠过渡带的土壤肥力水平。【结果】过渡带和灌丛下的土壤p H均呈碱性,且随土壤深度增加碱性增强;土壤中全N、全P、全K和速效N、速效P、速效K含量都随着土壤深度的增加而降低。富集率表明,在胡杨灌丛,土壤OM、全N、全P、全K、和速效养分含量都表现为EB1,且EB在垂直剖面上呈现先增大后减小的趋势,在20~40cm深度土壤聚集效果最为显著,其中有机质、全K、速效N、速效K富集率相对较大。SFI模型标明,绿洲-荒漠过渡带灌丛下的土壤肥力状况明显高于灌丛间过渡带。【结论】胡杨灌丛下存在典型的灌丛"肥岛"现象,灌木的长期生长能够增强土壤空间异质性的作用,改善灌丛下土壤养分结构和肥力水平,使土壤沙化程度得以缓解。
[Abstract]:[objective] to analyze and test the effect of shrub "fertilizer island" effect on desert soil fertility in the oasis desert edge of Taklimakan desert. [methods] the method of field sampling and laboratory experiment was used to analyze the effect of shrub "fertilizer island" on desert soil fertility. The soil nutrient contents in different depths of Populus euphratica (Populus euphratica) (Populos euphraticu) shrub jungle and its surrounding transitional zone were measured. The soil fertility level of the Oasis-desert transitional zone in southern Xinjiang was evaluated by calculating the enrichment rate and constructing the soil fertility index model. [results] soil pH under the transitional zone and shrub was alkaline and increased with the increase of soil depth. The contents of total N, total P, total K, available N, available P and available K in soil decreased with the increase of soil depth. The enrichment rate showed that in Populus euphratica shrub, soil OM, total N, total P, total K, and available nutrients were all EB1, and EB increased first and then decreased in vertical profile, and the effect of soil accumulation was most significant in the depth of 20~40cm, among which organic matter. The model of total K, available N, and available K is relatively large. SFI model shows that the soil fertility under the oasis desert transitional zone is obviously higher than that under the shrub transition zone. [conclusion] there is a typical "fertilizer island" phenomenon under Populus euphratica shrub. The long-term growth of shrubs can enhance the spatial heterogeneity of soil, improve the soil nutrient structure and fertility level under shrub, and alleviate the degree of soil desertification.
【作者单位】： 喀什大学化学与环境科学学院;新疆生物类固废资源化工程技术研究中心;
【基金】：新疆维吾尔自治区高校科研计划青年教师科研启动基金(XJEDU2013S37)
【分类号】：S158
本文编号：2194845
[Abstract]:[objective] to analyze and test the effect of shrub "fertilizer island" effect on desert soil fertility in the oasis desert edge of Taklimakan desert. [methods] the method of field sampling and laboratory experiment was used to analyze the effect of shrub "fertilizer island" on desert soil fertility. The soil nutrient contents in different depths of Populus euphratica (Populus euphratica) (Populos euphraticu) shrub jungle and its surrounding transitional zone were measured. The soil fertility level of the Oasis-desert transitional zone in southern Xinjiang was evaluated by calculating the enrichment rate and constructing the soil fertility index model. [results] soil pH under the transitional zone and shrub was alkaline and increased with the increase of soil depth. The contents of total N, total P, total K, available N, available P and available K in soil decreased with the increase of soil depth. The enrichment rate showed that in Populus euphratica shrub, soil OM, total N, total P, total K, and available nutrients were all EB1, and EB increased first and then decreased in vertical profile, and the effect of soil accumulation was most significant in the depth of 20~40cm, among which organic matter. The model of total K, available N, and available K is relatively large. SFI model shows that the soil fertility under the oasis desert transitional zone is obviously higher than that under the shrub transition zone. [conclusion] there is a typical "fertilizer island" phenomenon under Populus euphratica shrub. The long-term growth of shrubs can enhance the spatial heterogeneity of soil, improve the soil nutrient structure and fertility level under shrub, and alleviate the degree of soil desertification.
【作者单位】： 喀什大学化学与环境科学学院;新疆生物类固废资源化工程技术研究中心;
【基金】：新疆维吾尔自治区高校科研计划青年教师科研启动基金(XJEDU2013S37)
【分类号】：S158
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