东北低温农区近四十年气温降水变化及其对面源氮磷输出影响
发布时间：2018-09-10 12:40
【摘要】：为了解在全球气候变化背景下,流域氮磷输出对雨温条件变化的响应,选取我国三江平原典型低温农区,在详细分析1975—2014年历史气象数据的基础上,利用SWAT模型,明确了阿布胶河流域的氮磷流失特征。结果表明:研究区近40年日平均气温以0.132℃·10a~(-1)的微弱趋势上升,降水量自20世纪80年代开始呈下降趋势,总减少量不超过140 mm,且年际差异较大(11.60~415.50 mm);N、P输出与降水量显著正相关,丰水年的输出量分别是枯水年的1.5、2.5倍,且对降水变化的敏感性随降水量升高而降低;N、P输出总体与温度呈负相关,随温度的变化率分别为0.937 kg·hm~(-2)·℃~(-1)和0.161 kg·hm~(-2)·℃~(-1)。多年氮磷输出量在温度升高和降水减少的情势下上升,表明人为因素对污染输出可能产生更大影响,未来在低温农区开展面源氮磷输出对气候响应的针对性研究中有必要考虑自然和人为效应的区分。
[Abstract]:In order to understand the response of nitrogen and phosphorus output to the change of rain temperature under the background of global climate change, the typical low-temperature agricultural area of Sanjiang Plain in China was selected. Based on the detailed analysis of historical meteorological data from 1975 to 2014, the SWAT model was used. The characteristics of nitrogen and phosphorus loss in Abu Chao River basin are clarified. The results show that the daily average temperature of the study area in the past 40 years has risen slightly at 0.132 鈩，
本文编号：2234475
[Abstract]:In order to understand the response of nitrogen and phosphorus output to the change of rain temperature under the background of global climate change, the typical low-temperature agricultural area of Sanjiang Plain in China was selected. Based on the detailed analysis of historical meteorological data from 1975 to 2014, the SWAT model was used. The characteristics of nitrogen and phosphorus loss in Abu Chao River basin are clarified. The results show that the daily average temperature of the study area in the past 40 years has risen slightly at 0.132 鈩，
本文编号：2234475
本文链接：https://www.wllwen.com/kejilunwen/nykj/2234475.html
