我国污水灌溉的分布特征及其成因

CHARACTERISTICS OF THE DISTRIBUTION OF SEWAGE IRRIGATION IN CHINA AND ANALYSIS OF ITS CAUSE OF FORMATION

本文指出利用污水的水肥资源促进农业增产并净化污水是污灌迅速发展的主要原因。作者把全国划分为三大污灌类型区,并重点研究了我国污水灌溉的区域分异及其形成原因;对影响污灌分布的三种主要因素——水肥、耕地和人口因素进行了数值分析。

The whole country is divided into three typal realms under sewage irrigation on the basis of comprehensive natural conditions and characteristics of sewage irrigation.Geographical differentiation of sewage irrigation in China and its cause of fomation are emphatically studied. According to the sewage irrigation regionalization in China, geographical distribution of sewage irrigation is as follows.Division iRegion1 Arid farming division of the nor-thern part of ChinaI1 Cold and humid region of Northeast ChinaI2 Warm and subhumid region of North ChinaI Paddy field division of the sou-thern part of ChinaI1 Humid and warm region of Central China I2 Humid anb hot region of SouthChinaHI Arid division in Northeast China III1 Sub-arid region north of theGreat WallIII2 Arid region in Northwest China IV Qinghai-Tibetan frigid plateau di-vision IV1 Sichuan-Tibetan alpine and rivervalley region IV 2 Chiang tang Plateau regionThe numerical value of the three factors influencing the distribution of sewage irrigation has been analyzed. Their coefficients of weight are determined. General index of distribution of sewage irrigation of the realms are respectively counted.The conclusion is that the factor of water and fertilizer is the leading factor of distribution of sewage irrigation, the next one is cultivated area, and the third is population.