保护性耕作条件下土壤物理性状的研究

设置留茬覆盖、留茬无覆盖、旋耕3种处理,研究大豆田的土壤温度、土壤水分、土壤容重的动态变化。结果表明,留茬覆盖处理保水、保土、保肥的效果越好,对地表温度影响也越大。留茬无覆盖处理在耕作层(15cm以上)温度要高于旋耕处理,对种子萌发和出苗有利,但是其土壤水分较留茬覆盖处理低。不同耕法条件下0～20cm土层容重:留茬无覆盖留茬覆盖旋耕,但在20～30cm土层3种处理容重差距不大。

Study on soil physical properties under conservation tillage

This work was conducted in orderto study the dynamics of soil temperature,soil moisture and soilbulkdensity underthree treatments:straw-mulching (ST),remaining stubble without cover(RSC) and rotary tillage (RT).The results showed that ST treatment increased soil moisture,but decreased the soil temperature more effectively than other treatments.The soil temperature under RSC treatment was higher,but the soil moisture was lower than those of RT treatment (above 15 cm).Soil bulk density within 20 cm depth followed the order of RSC>ST>RT;however,there was no significant difference in soil bulk density between 20 and 30 cm among three treatments.