摘要
景电灌区是甘肃中部重要的引黄灌溉区,地处黄土高原与腾格里沙漠的过渡地带,1990年底保灌水地约17000ha(未含二期灌区新垦水地),土壤受各种自然因素和人为活动的影响,形成了各类低产土壤7466.1ha。造成低产的原因主要有四:①土壤盐化,②地力不足,③漏水漏肥,④重用轻养。“七五”期间,我们对400ha中低产田,针对低产因素进行了分类治理,收到了明显效果,小麦产量平均由2806.5kg/ha增加到3900kg/ha,增产率为39％;4年累积增产小麦9240t,新增收益305万余元,同时土壤肥力状况也得到了明显改善,据30个监测点土壤分析结果:有机质由0.92％提高到1.05％,全氮由0.06％提高到0.07％,速效磷由6.9ppm提高到7.7ppm,0～20cm土层容重比对照下降0.12g/cm^3,每m土体内的全盐量由0.5888％下降为0.3278％.
The Jingtai irrigation region, located in the transition zone between the loess plateau and the Tengeli desert, is a important area irrigated with the water of the Yellow river. In 1990,the area of irrigated fields is up to 17000 ha (not including new reclaimotion irrigated land in the second period). Because of various natural factors and artificial activities, the lowyeild land formed extensively. The reasons of forming low yield land are chiefly due to: 1. the salinization; 2 . the infertility; 3. the leakage of water and fertilizer;4. the over-use and lack of protection. During the period of seventh Five-Year Plan, we carried out a classified transformation study on 4000 ha of middlle and low yield land and obtained a good result. The output of wheat increased from 2806.5kg to 3900kg per ha. The sum output increased was 9.24×10~6kg during the past four years and the net output profit was 3.05 million yuan. The soil fertility was also improved distinctly.According to the soil analysis results of 30 sampling points, soil organic matter increased from 0.92% to 1.05%, total N from 0.06% to 0.07%, available P from 6.9ppm to 7.7ppm.The bulk density of soil (0～20cm) decreased by 0.12g/cm^3 in comparison with control soils. The total content of salts in 1～100cm soil decreased from 0.5888% to 0.3278%.
出处
《甘肃农业大学学报》
CAS
CSCD
1992年第1期78-82,共5页
Journal of Gansu Agricultural University
关键词
中低产田
分类
治理
改造
Jingtai irrigation region
middle and low yield land
classified transformation
