【摘要】：【目的】為了分析和檢驗塔克拉瑪干沙漠邊緣綠洲-荒漠中灌木"肥島"效應對荒漠土壤肥力的作用強度�！痉椒ā坎捎靡巴馊雍褪覂�(nèi)實驗分析相結(jié)合的方法,測定了胡楊(Populos euphraticu)灌叢林及周邊過渡帶中不同深度土壤養(yǎng)分含量;通過計算富集率和構(gòu)建土壤肥力指數(shù)模型評價南疆綠洲-荒漠過渡帶的土壤肥力水平�！窘Y(jié)果】過渡帶和灌叢下的土壤p H均呈堿性,且隨土壤深度增加堿性增強;土壤中全N、全P、全K和速效N、速效P、速效K含量都隨著土壤深度的增加而降低。富集率表明,在胡楊灌叢,土壤OM、全N、全P、全K、和速效養(yǎng)分含量都表現(xiàn)為EB1,且EB在垂直剖面上呈現(xiàn)先增大后減小的趨勢,在20~40cm深度土壤聚集效果最為顯著,其中有機質(zhì)、全K、速效N、速效K富集率相對較大。SFI模型標明,綠洲-荒漠過渡帶灌叢下的土壤肥力狀況明顯高于灌叢間過渡帶�！窘Y(jié)論】胡楊灌叢下存在典型的灌叢"肥島"現(xiàn)象,灌木的長期生長能夠增強土壤空間異質(zhì)性的作用,改善灌叢下土壤養(yǎng)分結(jié)構(gòu)和肥力水平,使土壤沙化程度得以緩解。
[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.
【作者單位】： 喀什大學化學與環(huán)境科學學院;新疆生物類固廢資源化工程技術(shù)研究中心;
【基金】：新疆維吾爾自治區(qū)高�？蒲杏媱澢嗄杲處熆蒲袉踊�(XJEDU2013S37)
【分類號】：S158

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