| 低山丘陵区红壤酸雨中典型阴离子垂直迁移状况及模拟 |
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| 引用本文： | 方堃,陈效民,杜臻杰,张佳宝,邓建强,孙江慧,周春明.低山丘陵区红壤酸雨中典型阴离子垂直迁移状况及模拟[J].农业环境科学学报,2009,28(1). |
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| 作者姓名： | 方堃 陈效民 杜臻杰 张佳宝 邓建强 孙江慧 周春明 |
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| 作者单位： | 1. 南京农业大学资源与环境科学学院,江苏南京,210095
2. 中国科学院南京土壤研究所,江苏南京,210008 |
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| 基金项目： | 国家重点基础研究发展规划(973计划)，中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室开放课题 |
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| 摘 要： | 酸雨中的SO2-4和NO3-等阴离子在土壤中迁移时会引起大量的盐基离子淋溶,导致土壤退化.用室内土柱模拟SO2-4和NO3-在红壤旱地各土层中的垂直穿透状况,并用Hydrus-ID模型对试验结果进行了拟合和预测.结果表明,NO;在红壤各层中的穿透速度较快,其中在耕作层的穿透曲线峰值最高,C/Co达到0.39,峰值高低顺序依次为:耕作层>母质层>淋溶层>犁底层.SO42-在土柱中的穿透速度远低于NO2-,穿透曲线有明显的拖尾现象.其在各土层的穿透时间依次为:母质层>犁底层>淋溶层>耕作层;而其峰值高低顺序依次为:耕作层>淋溶层>母质层>犁底层.最高点耕作层的顶点C/Co仅为0.22.用Hydros-ID模型对试验结果进行模拟,所得的SO42-和NO3-穿透土壤的浓度模拟值与其实测值均呈极显著的正相关关系.利用数学模拟获得了饱和导水率和垂直扩散率等溶质运移参数,并预测了研究区酸雨后SO42-和NO3-在红壤耕层的迁移状况,表明SO42-会在酸雨结束后持续淋溶,从而影响土壤中Ca、Mg等盐基离子的淋失.
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| 关 键 词： | 红壤 酸雨阴离子 穿透曲线 Hydrus-ID模型 |
SO_4~(2-) and NO_3~- Break Through Situations in Representative Red Soils and Prediction by Hydrus-1D Model |
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| FANG Kun,CHEN Xiao-min,DU Zhen-jie,ZHANG Jia-bao,DENG Jian-qiang,SUN Jiang-hui,ZHOU Chun-ming.SO_4~(2-) and NO_3~- Break Through Situations in Representative Red Soils and Prediction by Hydrus-1D Model[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2009,28(1). |
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| Authors: | FANG Kun CHEN Xiao-min DU Zhen-jie ZHANG Jia-bao DENG Jian-qiang SUN Jiang-hui ZHOU Chun-ming |
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| Institution: | 1.College of Resources and Environmental Sciences;Nanjing Agricultural University;Nanjing 210095;China;2. Instituie of Soil Science;Chinese Academy of Sciences;Nanjing 210008;China |
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| Abstract: | Acid rain is a global menace from agricultural, environmental and ecological perspective. SO24- and NO3- are major anions in acid rain which can speed up soil acidification and result in leaching losses of the basic cations. In this study, some soil columns were used to de- scribe the break through curves (BTCs)of infiltration of SO24- and NO3- in typical red soils. The breakthrough velocity of SO24- was lower than that of NO3-. A remarkable difference in BTCs of NO3- was observed in different soil layers. ... |
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| Keywords: | red soil SO24- and NO3- break through curves Hydrus-1D model |
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