摘要
采用农田生态系统磷平衡计算方法,对北京地区密云县和房山区农田土壤磷养分平衡状况进行了研究。结果表明,2006年密云和房山的磷盈余总量分别为4084.11t和10851.19t,磷盈余强度分别为110.81kg/hm2和386.48kg/hm2。磷肥是密云和房山磷素投入的最主要来源,化肥磷的施用量是造成农田土壤磷平衡空间差异的直接因素,两者呈极显著相关关系。不同乡镇化肥投入差异较大,导致磷平衡总量和强度分布严重不平衡,房山县的磷平衡量由西北向东南递增。密云县磷盈余强度表现为西部少,东部多,房山区磷盈余强度较大的地区多在南部地区。通过对比研究,分析磷素养分损失态和盈余态负荷基本趋势,找到污染潜势产生原因,提出了促进农田磷素平衡与降低磷养分负荷相应调控对策和措施。
By applying methodology of phosphorus balance of farmland ecological system,taking Miyuan County and Fangshan County,Beijing as examples,the soil nutrient balance of phosphorus were studied. Results showed that in 2006,total phosphorus surplus in Miyuan and Fangshan were 4,084.11t and 10,851.19t respectively,and phosphorus surplus intensity were 110.81kg/hm2 and 386.48kg/hm2. Phosphorus fertilizer is the most important source of phosphorus inputs in Miyun and Fangshan. Use of phosphate fertilizer was one of...
出处
《环境科学与技术》
CAS
CSCD
北大核心
2010年第10期195-199,共5页
Environmental Science & Technology
基金
国家水体污染控制与治理科技重大专项(2008ZX07209-007
2009ZX07632-02
2009ZX07106-001)
关键词
农田
磷肥
磷平衡
盈余强度
farmland
phosphate fertilizer
phosphorus balance
surplus intensity
