华北平原一年两熟保护性耕作体系试验研究

冬小麦-夏玉米一年两熟的种植方式在华北地区的农业生产中具有极为重要的地位。但是传统耕作方式使该地区的农业生产不可持续。保护性耕作技术是一种先进的保水保土的生产技术。该文在田间试验的基础上，研究了保护性耕作体系对作物产量、土壤容重、土壤含水率、土壤温度的影响，结果表明：保护性耕作能够提高作物的产量，增加土壤的含水率。其对土壤容重和土壤温度的影响并未对作物的生长产生不利影响。但是，从长远来看，对保护性耕作引起的土壤容重增加、温度降低的问题必须引起足够的重视。结果初步表明：以免耕加覆盖为主的保护性耕作体系可以在华北平原一年两熟地区试验推广。

Experimental Study on Conservation Tillage System in Areas of Two Crops a Year in North China Plain

The conventional tillage pattern of two crops a year in North China Plain has played a very important role. But it has hindered sustainable agricultural development. Conservation tillage technology is an advanced technology which can protect soil from erosion and can keep soil moisture. Based on field experiments,the effects of conservation tillage system on yield, moisture content, soil temperature and soil bulk density were studied. The preliminary results show that conservation tillage technology can increase yield and moisture content of soil, and the effects of conservation tillage on soil temperature and soil bulk density do no harm to plants' growing. But in the long run, the effects of conservation tillage on soil temperature and soil bulk density need to be further studied. The results show that the conservation tillage in North China Plain is adaptable.