一、次生盐渍化的主要成因1、灌溉渠系渗漏：全团各级渠道总长约1130公里，而防渗渠系总长仅占渠系总长不足10％。渠系有效利用率不足0．5，引水渠系长，渗漏量大，最远渠系达20公里，导致地下水位不断抬高。2、洪沟水库渗漏严重，造成我团八连、四连、三连、六连土地的地下水 I. Main Causes of Secondary Salinization 1. Leakage of irrigation canal system: The total channel length of the entire regiment at all levels is about 1130 kilometers, while the total length of anti-seepage canal system accounts for less than 10% of the canal total length. The effective utilization of the canal system is less than 0.5, the length of the diversion channel is large, the amount of leakage is large, and the farthest reaches reach up to 20 km. As a result, the groundwater level is continuously raised. 2, Honggou reservoir leakage serious, resulting in my group eight even, four even, three even, six consecutive land of groundwater