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    题名 作者 年代 出处 被引量
1农业生态系统的氮素循环研究进展显示文摘在自然和人为作用的双重驱动下,地球表面氮素的生物地球化学过程及其环境效应成为当前全球变化中区域研究的重要内容。探讨了氮素循环各个过程及其数量特征,对氮素循环模型进行了介绍,并对当前生态系统中氮素循环的研究热点进行了简要的论述。李志博 王起超 陈静 2002土壤与环境2002,11,4:41
2137Cs示踪技术在黑土区农业非点源污染负荷研究中的应用显示文摘利用137Cs核素示踪和定位监测相结合,研究松嫩平原黑土区3个旱作坡面土壤的流失厚度和流失速率,坡面土壤流失厚度1.20~5.25mm/a,侵蚀强度1355.0~7558.2t/(km2.a);近40a来,松嫩平原黑土区年均入河(湖)农业非点源污染负荷分别为TN1.43t/(km2.a)、NH3-N15.01kg/(km2.a)、NO3-N8.51kg/(km2.a)TP0.42t/(km2.a)、PO43-P1.85kg/(km2.a);土壤流失氮以有机氮为主;水溶态无机氮占总氮的0.51%,水溶性磷酸盐磷占总磷的0.12%。黑土区农业非点源污染物的输出和水土流失密切相关,深入研究其输移机理及防治措施具有重要的环境意义。杨育红 阎百兴 沈波 曹会聪 2010地理科学2010,30,1:7
3Impact of nutrient losses from agricultural lands on nutrient stocks in Dianshan Lake in Shanghai, China显示文摘The water quality of Dianshan Lake in Shanghai Municipality, China, is impacted by nutrient losses from agricultural lands around the lake. In this study, nine types of agricultural land use were monitored in 2010 and 2011, and a correlation analysis between nutrient losses from agricultural non-point sources(NPS) and nutrient stocks in the lake was conducted over monthly and seasonal time periods. The results indicate that the monthly average concentration of total nitrogen(TN) ranged from 1.41 to 7.34 mg/L in 2010 and from 1.52 to 5.90 mg/L in 2011, while the monthly average concentration of total phosphorous(TP) ranged from 0.11 to 0.26 mg/L in 2010 and from 0.13 to 0.30 mg/L in 2011. The annual loss of TN from agricultural NPS was 195.55 tons in 2010 and 208.40 tons in 2011. The cultivation of water oat made the largest contribution to the loss of TN. The annual loss of TP was 44.58 tons in 2010 and 48.12 tons in 2011, and multi-vegetable cultivation made the largest contribution to the loss of TP. The results of correlation analysis show that the monthly stocks of TN and TP in the lake have a positive correlation with the monthly losses of TN and TP from agricultural NPS. According to the seasonal data, the stocks of TN and TP in the lake both have a much stronger correlation with the losses of TN and TP from agricultural NPS in summer than in other seasons. Agricultural NPS pollution control should be the main focus for the water resource conservation in this area.Shou-bing WANG Xiao-xue MA Zheng-qiu FAN Wei-qian ZHANG Xiao-yong QIAN 2014Water Science and Engineering2014,7,4:2
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