| 摘要: |
| 对典型旱农地区陕西长武县2002和2003年降水输入旱地农田生态系统的养分进行了测定。结果表明，黄土旱塬区2002和2003年通过降水输入的氮素分别为6.72和10.80 kg/hm2;氮素输入主要发生在6～9月，占全年输入量的57.8%;降水输入的N主要是NH4+－N，2002年输入的NH4+－N占降水输入总N量的68.5%±11.3%,2003年占63.6%±9.4%。通过降水输入的K在2002和2003年分别为0.959和2.686 kg/hm2。NH4+－N,NO3-－N,K和无机N总量与降雨量之间有极显著相关关系，且各养分量之间也有一定的相关性。 |
| 关键词: 旱地农田 生态系统 降水补给 养分变化分析 |
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| 基金项目:中国科学院知识创新工程项目(KZCX2-413)；国家“十五”科技攻关项目(2001BA508B18) |
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| Study on nutrients added to agro-ecosystem by wet deposition in arid area |
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| Abstract: |
| Wet deposition (precipitation) samples were collected in Changwu' Shaanxi for 2 years and mineral nutrients in it were analyzed.Results showed that wet deposition brought a large amount of mineral nutrients into agro-ecosystem in the loess plateau.The amounts of N were 6.72 kg/hm2 and 10.80 kg/hm2 in 2002 and 2003 respectively.It mainly happened from June to September,and brought 57.8% of the total mineral nitrogen.The main form of nitrogen introduced by wet deposition was NH4+－N,which occupied 68.5%±11.3% and 63.6%±9.4% of the total mineral nitrogen in 2002 and 2003 respectively.The amounts of K it brought into the agro-ecosystem were 0.959 kg/hm2 and 2.686 kg/hm2 in 2002 and 2003 respectively.The result of statistics showed that there is a correlation among NH4+－N,NO3-－N,K,total mineral N and rainfall. |
| Key words: arid farmland agro-ecosystem precipitation recharge analysis of variety of nutrients |
