准噶尔盆地灰漠土无机磷形态及磷吸附特性研究

发布时间：2019-08-19 16:39

【摘要】：选择新疆准噶尔盆地灰漠土作为研究对象,通过测定灰漠土中不同形态的无机磷素含量并进行土壤磷素等温吸附实验,研究灰漠土中各形态无机磷素的有效性和土壤磷吸附特征。结果表明,灰漠土中无机磷形态主要是Ca-P,占全磷含量75%以上,且以Ca10-P形式为主,其次为Ca8-P和Ca2-P,无机磷中Al-P、Fe-P和O-P含量较少。全剖面中随着土层深度增加,Ca2-P、Ca8-P和Al-P占全磷总量的比例减少,Ca10-P占全磷总量则有所增加,0~20 cm土层全磷和Olsen-P含量最高,分别平均为926 mg·kg~(-1)和51.54 mg·kg~(-1)。统计分析表明Ca2-P、Al-P是最有效的磷源,Ca8-P和Fe-P是第二有效磷源,O-P和Ca10-P则是作物的潜在磷源。利用Langmuir方程拟合灰漠土的磷等温吸附曲线,得出土壤最大吸磷量(Xm)为957±629 mg·kg~(-1),吸附参数(K)为149.285±89.225;灰漠土的粘粒含量对Xm影响最大,其次是有机质,p H值影响最小。
[Abstract]:The grey desert soil in Junggar Basin of Xinjiang was selected as the research object. The availability of inorganic phosphorus and the characteristics of soil phosphorus adsorption in gray desert soil were studied by measuring the content of inorganic phosphorus in different forms of grey desert soil and carrying out soil phosphorus isotherm adsorption experiment. The results showed that Ca-P, accounted for more than 75% of the total phosphorus content in gray desert soil, and Ca10-P was the main form, followed by Al-P,Fe-P and O / P content in Ca8-P and Ca2-P, inorganic phosphorus. With the increase of soil depth, the proportion of Ca2-P,Ca8-P and Al-P to total phosphorus decreased, while the proportion of Ca10-P to total phosphorus increased, and the contents of total phosphorus and Olsen-P in 0 / 20 cm soil layer were the highest, with an average of 926 mg kg~ (- 1) and 51.54 mg kg~ (- 1), respectively. Statistical analysis shows that Ca2-P,Al-P is the most effective phosphorus source, Ca8-P and Fe-P are the second available phosphorus sources, and O / P and Ca10-P are the potential phosphorus sources of crops. The phosphorus isotherm adsorption curve of gray desert soil was fitted by Langmuir equation, and the maximum phosphorus uptake (Xm) and adsorption parameter (K) were 957 卤629 mg kg~ (- 1) and 149.285 卤89.225, respectively. The clay content of gray desert soil had the greatest influence on Xm, followed by the, p H value of organic matter.
【作者单位】：新疆农垦科学院;石河子大学农学院;华中农业大学资源环境学院;
【基金】：国家自然科学基金项目(41361051) 兵团重大科技专项(2015AA001-2)
【分类号】：S153.6

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