新疆地带性土壤磷吸附特性影响因素研究

发布时间：2018-05-18 10:08

本文选题：地带性土壤 + 灰漠土　；参考：《新疆农业科学》2017年08期

【摘要】：【目的】分析新疆南、北疆地带性土壤灰漠土和棕漠土的土壤磷吸附特性及磷最大吸附量与土壤基本理化性质的关系,筛选影响新疆地带性土壤吸附固磷能力的主要土壤性质。【方法】采集新疆北疆灰漠土和南疆棕漠土样品,进行磷等温吸附试验。【结果】灰漠土和棕漠土的磷等温吸附曲线都很好地拟合了Langmuir等温吸附曲线。北疆灰漠土最大吸磷量随着土壤pH值、粘粒含量的增加而增加;随着土壤有机质含量的增加呈现明显下降趋势。棕漠土的最大吸磷量随着土壤pH值、Ca CO3含量、粘粒含量的增加而增加。两种地带性土壤吸附固磷能力与土壤游离氧化铁、全磷、速效磷含量无显著相关性。【结论】影响灰漠土和棕漠土的吸附固磷能力的土壤性质包括粘粒含量、有机质含量、碳酸钙含量及pH值。棕漠土碳酸钙含量高达20%左右,pH值也高于灰漠土,导致棕漠土比灰漠土具有更强的吸附固定磷的能力,供试南疆棕漠土最大吸磷量平均为1 087.59 mg/kg;北疆灰漠土平均为820.77 mg/kg。
[Abstract]:[objective] to analyze the characteristics of phosphorus adsorption and the relationship between the maximum amount of phosphorus adsorption and the physical and chemical properties of soils in the zonal and brown desert soils of southern and northern Xinjiang. The main soil properties affecting the adsorption and fixation capacity of phosphate in zonal soils of Xinjiang were screened. [methods] the samples of grey desert soil and brown desert soil in northern Xinjiang and southern Xinjiang were collected. [results] the phosphate isotherm adsorption curves of grey desert soil and brown desert soil were all fitted well with Langmuir isotherm adsorption curve. The maximum phosphorus uptake increased with the increase of soil pH and clay content, and decreased with the increase of soil organic matter content. The maximum phosphorus uptake of brown desert soil increased with the increase of soil pH value Ca CO3 content and clay content. There was no significant correlation between the adsorption and fixation capacity of phosphorus in the two zonal soils and the contents of free iron oxide, total phosphorus and available phosphorus. [conclusion] the soil properties affecting the adsorption and fixation capacity of grey desert soil and brown desert soil include clay content and organic matter content. Calcium carbonate content and pH value. The content of calcium carbonate in brown desert soil was about 20% and the pH value of calcium carbonate was higher than that in grey desert soil, which led to the higher adsorption and fixation of phosphorus in brown desert soil than that in grey desert soil. The average maximum phosphorus uptake of brown desert soil was 1 087.59 mg / kg in south Xinjiang and 820.77 mg / kg in northern desert soil.
【作者单位】：新疆农垦科学院;石河子大学农学院;
【基金】：国家自然科学基金项目“新疆盐渍化土壤粘土矿物及其对成土环境的指示”(41361051) 兵团重大科技专项“兵团南疆垦区耕地盐渍化调控防治方法研究”(2015AA001-2)~~
【分类号】：S153

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