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/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 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/hm2 and 2.686 kg/hm2 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