【摘要】 为探明不同耕种模式对稻田土壤物理特性的影响,于广州市增城区、益阳市大通湖区和哈尔滨市道外区,分别进行了水稻犁耕机插(MT)、旋耕机插(RT)、犁耕机直播(MD)、旋耕机直播(RD)4种不同耕种模式试验,调查分析了4种不同耕种模式对各试验区的土壤干密度、孔隙度和含水率的变化规律。结果表明:在各试验区耕层0～20cm,与MD和RD相比,MT、RT可以降低土壤干密度、增加土壤孔隙度,增加土壤含水率,从而改善土壤结构;而各试验区耕层大于20cm的土壤受其自重和种植方式的影响下,物理指标的变化不尽相同,且与土壤质地也有一定关系。更多还原

【Abstract】 In order to find out the influence mechanism of different cultivation modes on the soil physical characteristics of rice fields,rice ploughing machine(MT),rotary cultivator(RT),plow direct-seeding(MD)and rotary cultivator direct-seeding(RD)were tested respectively in Zengcheng district of Guangzhou City,Datonghu district of Yiyang City and Daowai district of Harbin City.the investigation and analysis of the four different cultivation patterns on various experimental zone of soil dry density,porosity and soil moisture content.The results show that:compared with MD and RD,MT and RT could reduce the dry density of soil,increase soil porosity and increase soil moisture content in each experimental area by 0～20 cm,so as to improve soil structure.Under the influence of self-weight and planting mode,the changes of physical indexes of soils with plough layer greater than 20 cm in each experimental plot were different,and they were also related to soil texture.更多还原