Changing tendency and control measures of regional agricultural non - point source pollution 人为控制因素的作用更显著;而且随机性因素引起的空间变异主要表现在
Now soil erosion and non - point source pollution are becoming the attentive topic among the people 其中,土壤侵蚀和非点源污染问题正成为目前人们关注的话题。
Non - point source pollution has some characteristics , such that its harm is heavy and it is difficult to prevent 和点源污染相比,面源污染危害规模大、防治困难。
Relationship and simulation information system of land use cover change and non - point source pollution in yangtze river basin 南京某地农业土壤中有机污染分布状况研究
While non - point source pollution has no certain outfall , it has some relation with some weather conditions 而面源污染则不同,它没有固定的排放点,主要与一些气象条件相联系。
With strengthening control of point source pollution , agricultural non - point source pollution will be the main pollution source to the three - gorge reservoir area 随着点源污染的有效治理,农业面源污染将成为三峡库区水体的最主要污染源。
With the rapid urbanization , while point source pollution is of control , urban non - point source pollution turns into a serious threat to urban watershed 摘要随着城市化迅速发展,点污染源基本得到控制,非点污染源对城市水体构成严重的威胁。
Rainfall - runoff simulation is the very important technique for soil erosion , non - point source pollution , surface water balance calculation and some other study fields 降雨径流模拟是土壤侵蚀、非点源污染、地表水量平衡计算等众多研究领域的非常重要的技术手段。
So it is important to control and manage agricultural non - point source pollution to guarantee the water quality and realize the agricultural sustainable development 因此,要实现农业可持续发展,保证三峡水库水体质量,对农业面源污染进行控制和治理变得非常重要。
It is reported that agricultural non - point source pollution influence 30 % ~ 50 % of the world land and 12 % of 2 . 1 billion hm2 land in the world is caused by agricultural non - point source pollution 据报道,农业面源污染影响了全世界陆地面积的30 50 ,并且在全世界不同程度退化的21亿hm ~ 2耕地中,约12由农业面源污染引起。