摘要
通过对崇明东滩地区砂质旱田果园和菜地的全年降雨径流监测,研究了在实际生产过程中由于自然降雨所产生的地表径流及其氮磷径流流失负荷,并重点分析了典型雨量条件下的氮磷径流流失浓度及其形态。结果表明,崇明东滩地区降雨主要集中在5-9月,占总降雨量的53.64%,果园径流量与降雨量的相关系数达到0.911(P<0.01),菜地由于受到植被覆盖变化的影响,径流量与降雨量相关系数仅为0.673(P<0.05);典型降雨条件下氮磷径流流失的主要形态均为径流泥沙所携带的颗粒态氮磷,分别占TN和TP径流流失浓度的29.51%～64.36%和84.61%～99.77%;果园和菜地TN径流流失负荷分别达到4.33,4.28kg/(hm2.a),TP径流流失负荷分别达到8.53,5.24kg/(hm2.a),氮磷径流流失主要集中在降雨量较多的第三季度。
Nitrogen and phosphorous losses derived from rainfall runoff was studied through a whole year monitoring in orchard and vegetable filed with sandy soil in Chongming Dongtan,and the concentrations and characteristics of nitrogen and phosphorous losses under typical rainfalls were focally analyzed.The results indicated that,the rainfalls mainly occurred in the period from May to September,whose rainfall amount accounted for 53.64% of the total rainfall amount in the year,and the correlation coefficient of rainfall and runoff amount reached 0.911 （P〈0.01） in the orchard,compared to 0.673 （P〈0.05） in the vegetable field because of the vegetation coverage change.The particulate nitrogen and phosphorous carried by runoff sand were the primary forms of nitrogen and phosphorous losses under typical rainfalls,and accounted for 29.51%～64.36% and 84.61%～99.77% of the total nitrogen and phosphorous respectively.The TN loss load from rainfall runoff were 4.33,4.28 kg/（hm^2·a） respectively,while the TP loss loads were 8.53,5.24 kg/（hm^2·a） respectively in the orchard and vegetable field,and the nitrogen and phosphorous losses were mainly concentrated in the third quarter.
出处
《水土保持学报》
CSCD
北大核心
2010年第2期11-14,共4页
Journal of Soil and Water Conservation
基金
中国-意大利环境保护合作项目
关键词
崇明东滩
砂质旱田
地表径流
氮磷流失
Chongming Dongtan
sandy field
surface runoff
nitrogen and phosphorous losses
