| 陈安强,雷宝坤,刘宏斌,翟丽梅,王洪媛,毛妍婷,张丹.洱海近岸菜地不同土壤发生层的NH4+-N吸附解吸特征[J].农业环境科学学报,2017,36(2):345-352. |
| 洱海近岸菜地不同土壤发生层的NH4+-N吸附解吸特征 |
| Adsorption and desorption of NH4+-N in the different soil genesis layers in the nearshore vegetable field of Erhai Lake |
| 投稿时间：2016-08-09 |
| DOI：10.11654/jaes.2016-1023 |
| 中文关键词: NH4+-N 吸附-解吸 洱海近岸菜地 土壤发生层 |
| 英文关键词: NH4+-N adsorption and desorption nearshore vegetable field of Erhai Lake soil genesis layers |
| 基金项目:国家自然科学基金项目（41401248，41661048）；农业部面源污染控制重点实验室开放基金项目（2014-37）；国家水体污染控制与治理科技重大专项（2014ZX07105-001） |
| 作者 | 单位 | E-mail | | 陈安强 | 云南省农业科学院农业环境资源研究所, 昆明 650201 | | | 雷宝坤 | 云南省农业科学院农业环境资源研究所, 昆明 650201 | | | 刘宏斌 | 中国农业科学院农业资源与农业区划研究所, 农业部面源污染控制重点实验室, 北京 100081 | | | 翟丽梅 | 中国农业科学院农业资源与农业区划研究所, 农业部面源污染控制重点实验室, 北京 100081 | | | 王洪媛 | 中国农业科学院农业资源与农业区划研究所, 农业部面源污染控制重点实验室, 北京 100081 | | | 毛妍婷 | 云南省农业科学院农业环境资源研究所, 昆明 650201 | | | 张丹 | 云南农业大学资源与环境学院, 昆明 650201 | yidan33@163.com |
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| 中文摘要: |
| 采用等温吸附-解吸试验研究了洱海近岸菜地不同土壤发生层（耕作层A、犁底层P、潴育层W和潜育层G）NH4+-N的吸附解吸特征，并分析了吸附-解吸参数与土壤基本理化性质的关系，旨在为洱海近岸菜地不同土壤发生层氮素通过浅层地下水向洱海水体扩散通量的确定提供重要参数。结果表明：不同土壤发生层NH4+-N的等温吸附-解吸特征分别符合Langmuir模型和一元线性方程，而且不同土壤发生层NH4+-N的吸附-解吸过程具有不可逆性，解吸存在滞后性；不同土壤发生层NH4+-N的饱和吸附量（Q0）为435.597～982.757 mg·kg-1，NH4+-N平衡浓度（ENC0）为0.370～0.661 mg·L-1，解吸速率（K3）为0.281～0.729。土壤对NH4+-N的吸附能力为A层 > P层 > W层 > G层，而解吸能力与此相反。土壤中粉粒、黏粒含量和砂粒级微团聚体与Q0、最大缓冲容量（MBC）、ENC0呈正相关关系，与K3呈负相关关系。Q0、MBC、ENC0与不同土壤发生层OM、TN和NH4+-N呈正相关关系，与总铁、总锰和pH呈负相关关系，而K3有相反的变化。 |
| 英文摘要: |
| In order to illuminate the adsorption and desorption characteristics of NH4+-N in the different soil genesis layers of vegetable field around the Erhai Lake, the experiments of isothermal absorption/desorption were conducted and the effect of soil physicochemical properties on adsorption and desorption parameters were also analyzed. The results showed that isothermal adsorption and desorption characteristics of NH4+-N in the different soil genesis layers conformed to the Langmuir model and linear equation, respectively. Adsorption and desorption processes of NH4+-N in the different soil genesis layers were irreversibility, and there was a "hysteresis" phenomenon during the desorption process of NH4+-N. The saturated adsorption capacity Q0, equilibrium concentrations ENC0 and desorption rate of NH4+-N in the different soil genesis layers ranged from 435.597 to 982.757 mg·kg-1, from 0.370 to 0.661 mg·L-1 and from 0.281 to 0.729, respectively. The adsorption ability of NH4+-N among different soil layers was, in order of preference, A layer > P layer > W layer > G layer, while their desorption capability was contrary. Silt content, clay content and sand grade microaggregates in soil were positively correlated with Q0, the maximum buffer capacity MBC, equilibrium concentrations ENC0, and they were negatively correlated with desorption rate K3. Q0, MBC and ENC0 were positively correlated with organic matter OM, total nitrogen TN and NH4+-N, and they were negatively correlated with TFe, TMn and pH. But there were the opposite changes between K3 and chemical properties of different soil genesis layers. Above results of this study could provid valuable parameter for determining the diffusion flux of nitrogen from different soil genesis layers to Erhai Lake through shallow groundwater. |
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