For this reason , our objective is the research of the mechanism of runoff generation and characteristics of moisture changing process of slope farming purple soil , accordding to the theory of hydrology and the intergrated - means of compined the hydrology with the peodology , because it is the basis of the studies : soil erosion and protection , farming - land water balance , non - point pollute , etc . , and the direction gist of runoff arrange implement , solving water hazard and management of irrigation and fertilizer 综观国内外有关研究，我们认识到对紫色土土壤产流和水分变化特征的认识，是认识该区土壤侵蚀与保护、农田水量平衡、非点源污染等的机理和规律的基础，也是解决该区水患问题、实施径流调节而提高旱地的雨水利用程度，以及水肥管理等的基本科学依据。因此，以水文学原理为基础，采取水文学与土壤学、地理学、水土保持学等相结合的途径，研究紫色土坡耕地的降雨产流机制与产流后土壤水分的变化特征，是具有新的科学价值和现实意义的。
Accordingly , the change trend of each functional feeding groups from 1st to 6th order streams is congruent with rcc , but the degree of the gradient changes of shredder , collector and scraper groups are much smaller than those predicted by the theory because of the influence of non - point pollution 一至六级支流取食功能团变化趋势符合河流连续性理论，但撕食者、集食者及刮食者的梯度变化没有理论上的梯度变化明显，这是由于阊江河存在一定程度的非点源污染导致的。
Aimed at tackling the stochastic variations caused by non - artificial natural factors and accidental factors such as nonpoint source contamination and point source contamination in geochemical maps for different continental and sea media of eastern zhejiang coastal area , this paper puts forward a geochemical map formation method for different continental and sea media based on a suitable data - processing model and color area spatial distribution so as to improve the map face effects 摘要针对浙东沿海地区陆海不同介质采样区地球化学图中出现的自然因素，以及非点源污染和点源污染等因素引起的随机变异，提出选择一种适宜的数据处理模型和色区空间分配为内容的陆海不同介质地球化学成图方法，以改善图面效果。
The results showed that there were 2380 . 879 tons sediment - attached nitrogen , 10432 . 959 tons soluble nitrogen , 40 . 922 tons sediment - attached phosphorus and 295 . 679 tons soluble phosphorus inputted into the qiandao lake per year . monthly inputted loading changed very strongly , the loading was interrelated positively with rainfall and 70 % of total pollutant was exported from the watershed during the april and september 千岛湖流域氮、磷非点源污染的月输入负荷差异极大，氮磷污染物的输出量与月降雨量成正比，降雨集中的4 9月份是每年的污染物输出集中时期，氮、磷污染物输出量占全年总量的70以上。
