摘要
采用“静态吸收法”和“土柱淋溶法”、室内模拟试验 ,研究几种控释氮肥施入土壤后的氨挥发损失情况、N溶出速率、土壤脲酶活性及 pH值变化的关系 .结果表明 ,施氮 4 5 0mg·kg-1土时 ,3种控释氮肥氨挥发损失氮总量分别比普通尿素减少 4 9 7%、2 8 0 %和 71 2 % ;施氮 6 0 0mg·kg-1土时 ,3种控释氮肥氨挥发损失氮总量分别比普通尿素减少 34 6 %、12 3%和 6 9 9% .控释氮肥能显著降低土壤氨挥发量 ,减少因施肥而引起的大气环境污染 .控释氮肥氨挥发量与不同氮肥引起的土壤脲酶活性、pH值、土壤中氮溶出速率密切相关 .土壤的氨挥发总量与肥料在土壤中溶出总量的相关系数达到 0 95 33,在肥料施入的前期土壤氨挥发量同土壤脲酶活性、pH值的相关系数达到 0 95 33和 0 990
By using static absorption and soil column leaching methods,this paper studied the behaviors of several controlled-release N fertilizers in soil under laboratory conditions.The results showed that under the application rate of 450 mg·kg -1,total ammonia volatilization from three controlled-release fertilizers decreased by 49.7%,28.0% and 71.2%,respectively,in comparing with common urea.When the application rate was 600 mg·kg -1,total ammonia volatilization decreased by 34.6%,12.3%,69.9%,respectively.Controlled-release fertilizers could markedly reduce total ammonia volatilization from soil and decrease environment pollution via fertilization.The results also indicated that total ammonia volatilization correlated significantly with soil urease activity,pH value and N leaching rate.The correlation coefficient between total ammonia volatilization and accumulated N leaching rate was 0.9533,and that between total ammonia volatilization and soil urease activity and pH value was 0.9533 and 0.9908,respectively.
出处
《应用生态学报》
CAS
CSCD
2004年第12期2347-2350,共4页
Chinese Journal of Applied Ecology
基金
国家"8 63"计划项目 ( 2 0 0 1AA2 460 2 3 )
广东省农业政策项目(A2 0 40 5 )
广州市重点科技攻关资助项目 ( 2 0 0 1Z0 2 40 2)
关键词
控释氮肥
氨挥发
脲酶活性
PH值
溶出率
Controlled-release N fertilizer, Ammonia volatilization, Urease activity, pH value,Leaching rate.
