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Analysis and Reduction of NANI in typical orchar d in Beijing area*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2020 02
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Analysis and Reduction of NANI in typical orchar d in Beijing area*
GUO Hulin1 HAN Yuguo1 2** GUO Zifan1
1 School of Soil and Water Conservation, Beijing Forestry University, Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing 100083
2 Beijing Engineering Research Center of Soil and Water Conservation, Beijing 100083
NANI orchard Beijing area anthropogenic environmental pressure

Excessive nitrogen input caused by human activities has become the main cause of regional ecological environment deterioration. In order to explore the potential impact of nitrogen produced by human activities in Beijing on orchards, this study is based on the model of net anthropogenic nitrogen input (net anthropogenic nitrogen input, NANI), which is the combination of atmospheric deposition, fertilizer, food/feed and nitrogen fixation, estimated the net nitrogen input caused by human activities in Niegezhuang Orchard in 2018. The results show that the NANI value of the research area is 234 kg hm-2 a -1. Among them, the input intensity of fertilizer is 179 kg hm-2 a -1, accounting for 62.1% of NANI. The input intensity of atmospheric deposition is 65 kg hm-2 a -1, accounting for 22.5% of NANI. The other is nitrogen fixation (18 kg hm-2 a -1; 6.1%) and food/feed (-27 kg hm-2 a -1; -9.3%). The value of NANI in the study area is high, which is 1.4-3.9 times of the main watershed in China. Fertilizer is the main source of NANI in the region, and its application rate is 13% and 10% higher than the national and Beijing average. Atmospheric nitrogen deposition is the second largest source of NANI, which is 4.7 times the national average. Both fertilizer and atmospheric deposition have exerted certain pressure on the regional ecological environment. It is advisable to take corresponding measures to prevent excess nitrogen from flowing to the downstream water bodies. In the case of the average fertilization level in the country and Beijing, the NANI value in the study area can be effectively reduced by reducing the amount of fertilizer by 17-22 kg hm -2 a -1. By reducing or replacing one million gasoline-powered vehicles, the nitrate nitrogen in atmospheric deposition is reduced by 7.16 kg hm -2 a -1. This study shows that the most important source of NANI in this region is fertilizer and atmospheric deposition. Through a series of measures, the excess nitrogen in the region can be reduced to achieve the goal of purifying the environment.




Last Update: 2019-09-04