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| 酸雨对菜地系统氮素收支的影响 | |
| 引用本文： | 王定勇,蒋红梅,魏世强.酸雨对菜地系统氮素收支的影响[J].土壤学报,2009,46(6):1076-1082. |
| 作者姓名： | 王定勇 蒋红梅 魏世强 |
| 作者单位： | 1. 西南大学资源环境学院,重庆,400716;西南大学三峡库区生态环境教育部重点实验室,重庆,400715 2. 重庆市交通科研设计院,重庆,400067 3. 西南大学资源环境学院,重庆,400716;重庆市农业资源与环境研究重点实验室,重庆,400716 |
| 基金项目： | 重庆市生态环境保护行动计划项目，西南大学生态学重点学科"211工程"经费资助 |
| 摘 要： | 分别在酸沉降重污染区、轻污染区和对照区选择代表性的蔬菜样地,对土壤、蔬菜、降水、施肥、渗滤水等的氮素动态进行为时一年的定位、定时监测,研究了不同酸雨影响区氮素在菜地系统中的收支平衡。结果表明:在相同的种植条件下,由于酸雨影响了蔬菜的正常生长,致使酸雨影响区菜地系统中氮素收支失衡,酸沉降重污染区和轻污染区菜地系统中氮素I/O值分别为1.27和1.19;而对照区菜地系统中氮素I/O值为1.08,收支基本平衡。在酸沉降重污染区,降水输入系统的氮远大于轻污染区和对照区(约3~4倍),同时因酸雨危害,蔬菜产量明显低于对照区,仅为对照区产量的60%,使系统中通过作物收获的氮输出减少,结果导致大量氮滞留于土壤中并以硝态氮等形态淋失,给水环境带来了氮污染风险。 |
| 关 键 词： | 酸雨 菜地系统 氮素 收支 |
Effect of acid rain on nitrogen budget in vegetable field ecosystems |
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| Wang Dingyong,Jiang Hongmei and Wei Shiqiang.Effect of acid rain on nitrogen budget in vegetable field ecosystems[J].Acta Pedologica Sinica,2009,46(6):1076-1082. | |
| Authors: | Wang Dingyong Jiang Hongmei and Wei Shiqiang |
| Institution: | College of Resources and Environment, Southwest University; Key Lab of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Southwest University;Chongqing Communications and Design Institute;College of Resources and Environment, Southwest University; Chongqing Key Lab of Agricultural Resources and Environment |
| Abstract: | In order to understand effects of acid rain on nitrogen (N) balance of soil-vegetable systems, field experiments were carried out at three sites in Chongqing for one year to monitor N dynamics in soils and vegetables, atmospheric N deposition from rainfall, and N leaching loss. These sites were subjected to acid rain to a varying extent, i.e. heavily polluted area (HPA), lightly polluted area (LPA), and control area (CK). Under the condition of similar field management, acid rain affected normal growth of vegetables and hence N balance in the soil-vegetable systems at the three sites. The N I/O ratio (input/output) was 1.27 and 1.19 in HPA and LPA, respectively, while it was 1.08 (nearly reaching the balance) in CK. The N input from rainfall in HPA was about 3 to 4 times higher than that in LPA and CK. However, the biomass of vegetables in HPA was decreased by up to 40%, when compared with that in CK, thus leading to a significant decrease in N output through crop harvesting. As a result, a large proportion of N was sequestrated in the soils subjected to acid rain, which subsequently enhanced nitrate leaching posing a risk to water environment. |
| Keywords: | Acid rain Vegetable land system Nitrogen Input and output |
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