ISWC OpenIR  > 水保所知识产出(1956---)
摄晓燕1,2; 魏孝荣1,2; 马天娥1; 王玉红2,3; 张兴昌1,2
Source Publication植物营养与肥料学报 2015,21(5): 1373 -1380
Volume21Issue:5Pages:1373 -1380

改良土壤对磷的吸附机理和指导磷肥合理施用提供依据。【方法】本试验设计了砒砂岩和风沙土 0 ∶ 100(L)、10 ∶
90(LS1)、25∶ 75(LS2)、50∶ 50(LS3)、75∶ 25(LS4)、90∶ 10(LS5)和100∶ 0(S)(烘干质量比)7 个不同比例的改良模
式。研究了在 25℃下砒砂岩不同添加量改良风沙土的磷吸附动力学和等温吸附特征,并应用吸附动力学模型和等
吸附量的关系。【结果】1)同一初始浓度下,随着吸附时间的延长,改良土壤对磷的吸附量呈增大趋势,24 h 后逐
线以 Langmuir 模型的拟合效果最优。5)风沙土、砒砂岩和改良土壤对磷的吸附属于均质的单层吸附,由膜扩散和

Other Abstract

Appropriate amount of soft rock addition to sandy soil could improve water absorbing and
holding capacities,but little information about the nutrient availability was published. The adsorption of phosphorus
after added into such soft rock modified sandy soil was studied,aiming to understand phosphorus adsorption
characteristics and mechanism of soil improvement effect,and to guide reasonable fertilization of phosphorus.
【Methods】Soft rock was mixed with sandy soil in seven ratios: 0 ∶ 100(L),10 ∶ 90(LS1),25 ∶ 75(LS2),50 ∶
50(LS3),75∶ 25(LS4),90∶ 10(LS5)and 100∶ 0(S). The adsorption kinetic process and adsorption isotherms of
phosphorus were measured at 25℃,the adsorption kinetics and isothermal adsorption model was used to reveal  phosphorus adsorption mechanism of improved soils. The relation between proportion of soft rock and maximum
amount of phosphorus adsorption in improved soil has been known. 【Results】1) Under the same initial
concentration,the phosphorus adsorption capacity of improved soil showed a trend of increase with the extension of
reaction times and gradually achieved balance after 24 h. 2)In the case of adsorption time was determined,the
phosphorus adsorption quantity ncreased gradually with initial concentration increased in improved soil and until to
close or reach the maximum amount of phosphorus adsorption. 3)Adsorption capacity of phosphorus was larger in
sandy soil than in soft rock. With the increase of the soft rock proportion,phosphorus adsorption of improved soil
decreased. 4)The pseudo-second order kinetic modell was the best mode to fit phosphorus absorptive dynamics
processes. Within the concentration range in this study,the phosphorus adsorption isotherms were well represented
by Langmuir isotherm model. 5)The studies on the kinetics and isothermal absorption showed that the phosphorus
adsorption of improved soil was homogeneous monolayer adsorption,and both membrane diffusion and intra-particle
diffusion were the rate-controlling process in the adsorption system tested. The adsorption mechanism was mainly
ion exchange and chemical adsorption in the processes. 6)The maximum adsorption of phosphorus decreased about
linearly with the increased of soft rock proportion in improved soil. In the production practice,we can estimate the
maximum adsorption of phosphorus in modified soil through measure the maximum adsorption of phosphorus in soft
rock and sandy soil and the proportion of soft rock. 【Conclusions】Soft rock can significantly reduce the
phosphorus adsorption of sandy soil and increase the effectiveness of phosphorus fertilizer. So when re-vegetation,
the more soft rock proportion in sandy soil,the better effect of fertilizer. However,as plants growth,further
understanding of desorption and continuity of phosphorus in improved soil is needed.

Keyword磷素 吸附动力学 等温吸附 砒砂岩 风沙土 改良土壤
Indexed By中文核心期刊要目总览
Document Type期刊论文
Affiliation1.西北农林科技大学资源环境学院,陕西杨凌 712100
2.西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌 712100
3.中国科学院大学,北京 100049
Recommended Citation
GB/T 7714
摄晓燕,魏孝荣,马天娥,等. 砒砂岩改良风沙土对磷的吸附特性影响研究[J]. 植物营养与肥料学报 2015,21(5): 1373 -1380,2015,21(5):1373 -1380.
APA 摄晓燕,魏孝荣,马天娥,王玉红,&张兴昌.(2015).砒砂岩改良风沙土对磷的吸附特性影响研究.植物营养与肥料学报 2015,21(5): 1373 -1380,21(5),1373 -1380.
MLA 摄晓燕,et al."砒砂岩改良风沙土对磷的吸附特性影响研究".植物营养与肥料学报 2015,21(5): 1373 -1380 21.5(2015):1373 -1380.
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