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砒砂岩改良风沙土对铵态氮吸附特性影响研究
摄晓燕; 魏孝荣; 魏艳春; 马天娥; 许晶晶
2015
Source Publication农 业 机 械 学 报
Volume46Issue:11Pages:165-173
Abstract

由于砒砂岩的广泛分布和煤炭资料的开发利用,晋陕蒙接壤区出现了一系列生态环境问题。为恢复区域生
态,尝试利用区域内的砒砂岩来改良风沙土,以实现砒砂岩的资源化利用和受损生态系统的修复,本研究设计了风
沙土中砒砂岩不同添加比例(0、10%、25%、50%、75%、90%、100%)的改良模式。研究了 25℃下不同改良模式对
NH
+
4 -N 吸附动力学和等温吸附特征的影响,评价了不同模型对改良土壤的适应性,以期为建立合理的氮肥施用指
标和提高肥料利用率提供依据。结果表明:相同条件下,砒砂岩对 NH
+
4 -N 的吸附量大于风沙土;随着砒砂岩添加
比例的增加,改良土壤对 NH
+
4 -N 的吸附量呈线性增加关系。砒砂岩的添加可以显著增加风沙土对 NH
+
4 -N 的吸
附,增加土壤供氮的持续性,提高肥料的有效性。准二级动力学模型可用于拟合改良土壤对 NH
+
4 -N 的吸附动力学
曲线。NH
+
4 -N 的等温吸附曲线以 Freundlich 模型拟合效果更优。各处理对 NH
+
4 -N 的吸附均为自发过程,且为有
利吸附,吸附速率由膜扩散和颗粒内扩散共同控制。

Other Abstract

 Due to the widely existence of soft rock and the exploitation of coal resource,serious ecological
and environmental problems occurred in the contiguous areas of Shanxi,Shaanxi and Inner Mongolia in
China. In order to restore regionally ecological environment,this study was conducted to improve sandy
soil using soft rock in the energy communities,and realize the transformation of soft rock into available
resources. Previous research found that soft rock could improve hydraulic properties of sandy soil. But
there are few researches about the nutrient availability of soft rock distributed into sandy soil. Soft rock
was mixed in sandy soil with seven ratios: 0,10%,25%,50%,75%,90% and 100%. Adsorption
kinetic were determined and fitted with Freundlich,Langmuir,Temkin and Dubinin-Radushkevich
models. Adsorption isotherms were measured and modeled with Pseudo-first-order,Pseudo-second-order,
Bi-constant and Intra-particle diffusion models. This study was conducted to understand the effects of
different additive proportions of soft rock amended sandy soils on the adsorption of NH
+
4
-N,and to select
the optimal adsorption model of improved soil. The results can be used to guide reasonable fertilization of
nitrogenous and improve the utilization efficiency of fertilize. The results showed that: with the extension   of reaction times and the increase of equilibrium concentration,the NH
+
4
-N adsorption capacity was
increased in improved soil. Reaching to the adsorption equilibrium,sandy soil needs 4 hours and soft
rock needs 16 hours. Adsorption capacity of NH
+
4
-N was the largest in sandy soil and the least in soft
rock,the maximum adsorption of NH
+
4
-N in soft rock was 20 times of sand soil. With the increase of the
soft rock proportion in improved soil,NH
+
4
-N optimal adsorption was increased linearly. Soft rock could
improve the NH
+
4
-N adsorption capacity of sandy soil. The pseudo-second-order kinetic model and the
Freundlich isotherm model could well describe NH
+
4
-N absorption in improved soil. NH
+
4
-N adsorption is
a spontaneous process and a favorable adsorption.

Keyword铵态氮 改良土壤 砒砂岩 风沙土 吸附动力学 等温吸附
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8395
Collection水保所知识产出(1956---)
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.江西省农业科学院农业经济与信息研究所,南昌 330200
Recommended Citation
GB/T 7714
摄晓燕,魏孝荣,魏艳春,等. 砒砂岩改良风沙土对铵态氮吸附特性影响研究[J]. 农 业 机 械 学 报,2015,46(11):165-173.
APA 摄晓燕,魏孝荣,魏艳春,马天娥,&许晶晶.(2015).砒砂岩改良风沙土对铵态氮吸附特性影响研究.农 业 机 械 学 报,46(11),165-173.
MLA 摄晓燕,et al."砒砂岩改良风沙土对铵态氮吸附特性影响研究".农 业 机 械 学 报 46.11(2015):165-173.
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