城镇化对我国不同年代农田氮素循环的影响  

Influence of urbanization on N cycle of farmland of various periods in China

作　　者：魏静[1] 马林[1] 马文奇[1] 路光[1] 赵路[1] 

机构地区：[1]河北农业大学资源与环境科学学院,河北保定071001

出　　处：《河北农业大学学报》2009年第1期6-9,共4页Journal of Hebei Agricultural University

基　　金：国家自然科学基金项目(30571087);农业部948项目(2006-G60)

摘　　要：利用调查数据、文献资料和统计数据,采用物质流分析的方法,就城镇化对全国不同年代农田氮素循环的影响进行了初步探讨。结果表明:在全国这个相对封闭的大系统中,城镇化率与农田养分循环各指标间都存在显著正相关关系,随着年代的增加,在城镇化发展的同时,单位面积化肥氮投入量越来越高,2005年是1980年的2.7倍左右;单位面积有机氮投入量2005年是1980年的2倍左右,单位面积总氮投入量2005年是1980年的2.5倍左右,同时土壤养分的盈余量越来越多,对环境的威胁越来越大。This study preliminarily probed into some impacts of urbanization through survey data, literatures, statistical data and material flow analysis. The relationships between urbanization and regional nitrogen balance in agro-ecosystem were analyzed in light of survey on farmland of different periods in China. The results showed that in this relatively dose system of the whole country, there is a significantly positive correlation between urbanization rate and various indexes of farmland nutrient circulation; as time time passes and urbanization continues, use of fertilizer nitrogen per hector was becoming higher, roughly 2.7 times that of 1980 in 2005 ; use of organic nitrogen per unit area was about 2 times that of 1980 in 2005, use of total nitrogen 2.5 times that of 1980 in 2005 while the surplus amount of soil nutrient gradually increased.

关 键 词：城镇化 农田 氮素循环 

分 类 号：S158[农业科学—土壤学]