摘要
选取苏南太湖地区宜兴市和常熟市的水稻田为试验点，研究了不同施肥水平下缓冲带降低稻田田面水、渗漏水、灌溉水中N、P浓度的效果，以及对水稻产量的影响。结果表明：缓冲带与施肥处理的水稻产量差异不显著；稻季缓冲带拦截N、P径流损失效果明显，总氮净拦截量在20．6～51．8kghm^-2之间，占田面水中总氮的31．7％～50．9％，总磷净拦截量在4．7～5．1kghm^2之间，占田面水中总磷的1／2多，缓冲带对渗漏水中N、P的水平迁移具有同样明显的拦截效果，减少了N、P向水体的输入量；土壤剖面中N、P养分呈上高下低的趋势，稻田生态系统能净化灌溉水中的磷。
An experiment was carried out in 2005 in Yixing and Changshu, part of the Taihu Lake region, to study roles of buffer strips （BS） in reducing nitrogen （N） and phosphorus （P） concentrations in surface water, leachate, and irrigation water of paddy fields different in fertilization level during the rice-growing season, and their effect on yield of the crop. Results show that Treatment BS differed slightly from Treatment Fertilization in rice yield, but significantly reduced N and P loss by intercepting runoff. The total net N intercepted ranged between 20.6 and 51.9 kg hm^-2, accounting for 31.7% - 50.9% of the total dissolved N in the surface water, and the total net P intercepted did between 4.7 and 5.1 kg hm^-2, accounting for more than 1/2 of the total dissolved P in the surface water. Its role in intercepting N and P in leachate in soil profile was also apparent, reducing N and P transfer into water bodies. N and P concentrations in the profile display a declining trend with the depth, suggesting that paddy field can filter out N and P from irrigation water.
出处
《土壤学报》
CAS
CSCD
北大核心
2007年第5期873-877,共5页
Acta Pedologica Sinica
基金
国家重点基础研究发展规划项目(No.2005CB121107)
中国科学院台站基金项目资助
关键词
缓冲带
养分流失
水稻田
太湖地区
Buffer strip
Nutrient losses
Paddy field
Taihu Lake region
