| 摘要: |
| 于2003-02～2004-01，采用自动降雨收集器结合室内化学分析方法，研究了江西鹰潭红壤丘陵农业区降水中NH+4-N和NO-3-N沉降的动态变化，并与同期欧洲EMEP和美国NADP监测降水中的NH+4-N和NO-3-N沉降的动态变化进行了比较。结果发现，本研究区域降水中不同月份的NH+4-N和NO-3-N含量及沉降量均变异较大，各形态氮含量和沉降量的极值出现的月份基本同步，表现为春、冬季较高，夏、秋季较低；研究区域NH+4-N，NO-3-N和无机氮的平均含量分别为0.63，0.43和1.06 mg/L，分别是同期欧洲降水中对应形态氮平均含量的1.5，1.1和1.3倍，是同期美国降水中对应形态氮平均含量的2.7，2.0和2.4倍；低于同期欧洲降水中对应形态氮含量的最大值，与同期美国降水中对应形态氮含量的最大值相当；降水中NH+4-N，NO-3-N和无机氮的年沉降量分别为7.15，4.85和12.00 kg/hm2，降水中无机氮的年沉降量低于同期欧洲的最大值，与同期美国的最大值相当，但远高于两区域的平均值；降水中NH+4-N沉降最占无机氮沉降量的比例为60％，高于同期欧洲和美国的平均水平（52.2％和49.6％）。本研究结果表明，江西鹰潭红壤丘陵农业区氮湿沉降量较大，其对土壤、植被以及水体等的影响应引起关注。 |
| 关键词: 江西红壤丘陵农业区 氮湿沉降 降水监测 |
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| 基金项目:国家973项目(G1999011805)；中科院知识创新工程领域前沿项目(ISSASIP0205)；土壤与农业可持续发展国家重点实验室和教育部留学回国基金联合资助项目 |
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| Dynamic changes of wet nitrogen deposition in a typical hilly agricultural area in Yingtan,Jiangxi |
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| Abstract: |
| The dynamic changes of nitrogen deposition of precipitation was monitored at the typical hilly area of red soil in Yingtan,Jiangxi by automatic precipitation collector combined with lab analysis from Feb.2003 to Jan.2004,and the results were compared with data from EMEP and NADP at the same period.The results showed that the variation of the monthly average concentration and monthly deposition amounts of NH+4-N,NO-3-N and inorganic N were much greater.The extremes of them appeared almost synchronally,and behaved much higher in spring and winter than in summer and autumn.The annual average concentrations of NH+4-N,NO-3-N and inorganic N were 0.63,0.43 and 1.06 mg/L respectively,which were 1.5,1.1 and 1.3 times the averages of Europe,but lower than the maxima of Europe correspondingly,and were 2.7,2.0 and 2.4 times the averages of USA,but almost equal to the maxima of USA correspondingly.The deposition amounts of NH+4-N,NO-3-N and total mineral nitrogen were 7.15,4.85 and 12.00 kg/hm2 respectively.The total annual N deposition in precipitation was lower than the maximum in Europe,and almost equal to the maximum in USA,but much higher than the averages of these two areas.The contribution of NH+4-N was 60% in total inorganic N deposition,which was a little higher than the averages of Europe and USA(52% and 49.6%).The N deposition was comparatively high in this area,and its effects on soil,vegetation and water should be concerned. |
| Key words: agricultural area at the typical hilly of red soil in Jiangxi wet nitrogen deposition precipitation monitoring |
