广东蔬菜地土壤氮磷流失风险研究  

Study on the Risk of the Loss of Nitrogen and Phosphorus in Vegetable Land in Guangdong

作　　者：张永起[1,2,3] 李淑仪[2] 廖新荣[2] 蓝佩玲[2] 王荣萍[2] 艾绍卓 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510650 [2]广东省生态环境与土壤研究所,广东广州510640 [3]中国科学院研究生院,北京100049 [4]陕西省榆林市水务局水利规划设计研究院,陕西榆林719000

出　　处：《安徽农业科学》2010年第19期10135-10137,10166,共4页Journal of Anhui Agricultural Sciences

基　　金：广东省重大科技专项(2008A080800028;2009A080303008)

摘　　要：[目的]了解广东省蔬菜地土壤氮磷状况,减少氮素磷素大量流失,指导广东蔬菜地施肥。[方法]对广东部分地区74个地点的施氮量进行调查并测定57个土样土壤中Olsen-P、Mehlich1-P和Mehlich3-P含量。[结果]发现调查地区的平均施氮量为328.7kg/hm2,95.9%的调查数据高于引起流失的临界值(90kg/hm2)。66.7%的Olsen-P含量大于流失临界值(60mg/kg),96.0%的Mehlich-1P含量大于流失临界值(31mg/kg),55.8%的Mehlich3-P的含量大于临界值(150mg/kg)。[结论]广东蔬菜地土壤氮磷含量都很高,具有很大的流失风险,对广东蔬菜地施肥有指导作用。[Objective] The guidance for the fertilization in vegetable field in Guangdong could be provided based on the mastering of the situation of nitrogen and phosphorus in soil for the reduction of their loss.[Method] The nitrogen application rate（NAR）in 74 locations of Guangdong was investigated and the content of phosphorus available in soil was determined with three methods of Olsen-P,Mehlich1-P and Mehlich3-P.[Results]The results showed that average NAR was 328.7 kg/hm^2.95.9% of the investigation data in NAR was higher than the critical value（90 kg/hm^2）,which can cause loss when NAR was higher than critical value.Meanwhile,66.7% of Olsen-P content,96.0% of Mehlich1-P content and 55.8% of Mehlich3-P content were higher than critical value（60 mg/kg for Olsen-P,31 mg/kg for Mehlich1-P and 150 mg/kg for Mehlich3-P）,respectively.[Conclusion] The content of nitrogen and phosphorus in vegetable field in Guangdong was high with a great risk of their losing.

关 键 词：施氮量 含磷量 流失 

分 类 号：X53[环境科学与工程—环境工程]