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降水输入旱地农田生态系统中的养分研究 被引量:2

Study on nutrients added to agro-ecosystem by wet deposition in arid area
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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10.80kg/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NH+4-N,2002年输入的NH+4-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2.686kg/hm2。NH+4-N,NO-3-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。 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/hm2 and 10.80 kg/hm2 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 NH+_4-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/hm2 and 2.686 kg/hm2 in 2002 and 2003 respectively.The result of statistics showed that there is a correlation among NH+_4-N,NO-_3-N,K,total mineral N and rainfall.
出处 《西北农林科技大学学报(自然科学版)》 CSCD 北大核心 2005年第7期115-120,共6页 Journal of Northwest A&F University(Natural Science Edition)
基金 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)
关键词 旱地农田 生态系统 降水补给 养分变化分析 arid farmland agro-ecosystem precipitation recharge analysis of variety of nutrients
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