水旱轮作对土壤物理性质的影响

水旱轮作对土壤物理性质影响的研究结果表明:渍水稻田水改旱后,土壤的三相组成、结构性、孔性、透水性、持水性和供水性明显改善,土壤逐步向旱地方向发展;而旱改水后,则上述土壤物理性状出现向水稻土方向发展的趋势。这种趋势在耕作层比犁底层更明显。

THE INFLUENCE OF PADDY RICE AND DRYLAND CROPS ROTATION ON SOIL PHYSICAL PROPERTIES

The influence of paddy rice and dryland crops rotation on soil physical propertieswas studied. It is clear from this paper results that three phase constitution, soil stru-cture, soil pore property, soil permeability, water supply ability and retention abilityof soil were changed after two years of paddy rice and dryland crops rotation. If weplant dryland crop instead of paddy rice in the paddy field, the gaseous phase value,1-0. 01 mm microaggregate, macroporosity, permeability, specific water capacity of soilswere increased and water-retaining capacity of soils was decreased. If we plant paddyrice instead of dryland crop in the dryland field, the gaseous phase value, 1-0. 01 mmmicroaggregate, macroporosity, permeability, specific water capacity of soils were decre-ased and water-retaining capacity of soils was increased.