Improving the sustainability and mitigating environmental impacts of grazed grassland

摘要：

In New Zealand, the predominant land use is grazed pastures where animals graze outdoor pastures all year.In such systems, a major nitrogen (N) cycling process is the excretion of N in dung and urine by the grazing animal, returning 70％ ‐90％ of the N ingested to the soil.The N loading rate under a dairy cow urine patch can be as high as 1000 kg N ha‐1.This urine‐N is the major source for both nitrate (NO-3 ) leaching and nitrous oxide (N2 O) emissions in grazed pasture systems (Di and Cameron, 2002a, 2002b).Consequently, mitigation technologies have been developed to reduce both NO-3 leaching and N2 O emissions from grazed pasture systems using nitrification inhibitors.

关键词： grassland nitrate leaching nitrous oxide emissions grazing nitrification inhibitors

作者: H.J.Di K.C.Cameron

作者单位: Centre for SoiLand Environmental Quality,Lincoln University,Canterbury,New Zealand

会议类型: 国际会议

会议名称: 2008世界草地与草原大会

会议地点: 呼和浩特

会议语种:英文

在线出版日期: 2008-06-29（万方平台首次上网日期，不代表论文的发表时间）