农业可持续发展的四个维度分析

可持续发展是在保护环境的条件下既满足当代人的需求,又以不损害后代人的需求为前瞻的发展模式.它要求随着时间的变化人类及代际的福利不会减少,包含三个要素一环境要素、社会要素、经济要素,既减少环境损害,又能持续满足人类发展的需要,此外保证经济的发展有利可图.立足于中国实际,针对农业可持续发展,讨论了农业环境、社会经济体系、投入、耕种系统四个维度对于农业可持续发展的关系.

Influence of Cropping Systems on Soil Properties in Semi-arid Conditions of Setif, Algeria

The effects of two culture systems, conventional and no-till combined the previous crop （lentil and wheat） on soil properties were studied in the experimental site of the station Technical Institute for Field Crops （ITGC） Setif （Algeria） during the crop year 2011/2012. The results indicate that the no-till system affects positively the variables of soil properties and the organic matter has a rate of 2.89% compared to 2.44% in conventional tillage. If the conventional system has an infiltration of moisture relatively higher than that observed for no-till throughout the cycle, the no-tillage is distinguished by a higher storage of moisture at the end of cycle wheat cultivation. The results also indicate that the density （1.44 g/cm）, permeability （22.79 cm/h） and soil compaction （12.51 kg/cm） in no-till were significantly higher compared to conventional tillage 1.35 g/cm, 14.13 cm/h, 7.40 kg/cm, respectively.