摘要
为探明长期免耕和深松对土壤物理特征的影响,在长期定位试验中分层（0~10,10~20,…,90~100cm）采取环刀土壤样品,测定了0~100cm不同土层的土壤密度、土壤持水能力、供水能力、田间持水量、饱和含水量及有效含水量等。结果表明：随土层的加深,土壤密度表现为先降后增再趋于稳定,土壤持水能力表现为先降低再增加的趋势,土壤供水能力表现为先增加再降低再增加而趋于平缓,田间持水量表现为逐渐降低再增加的趋势,土壤有效水则表现为先增加后降低而趋于稳定的趋势。深松处理40cm以上土层的土壤密度相对较低,在20~50cm土层的持水能力最强,而在60~80cm土层,其持水能力却最低。在0~10和40~80cm土层,土壤供水能力表现为：免耕〉深松〉常规耕作。在20~40和80~90cm土层中,仍以深松处理的供水能力较强。在0~10cm土层中,各处理的饱和含水量和田间持水量均表现为：免耕〉深松〉常规耕作;在20~50cm土层,深松〉免耕〉常规耕作;在50~80cm土层,免耕〉深松〉常规耕作;在80cm土层以下,深松〉免耕〉常规耕作。免耕处理0~10cm土层的土壤有效水含量明显高于其他处理,而在10~50cm土层,深松处理最高。
To ascertain the effect of no-tillage and subsoiling on soil physical characteristics in long-term located experiment ,soil bulk density ,soil water-holding capacity ,water supply capacity ,field capacity ,saturated water content and available water content in dif‐ferent soil layer of 0~100 cm were measured .The results indicated ：with the deepening of soil ,soil bulk density increased after it fell down first ,and finally tended to be stable ;soil water-holding capacity performed first reduce and then increase ;water application showed a tend of increased first and then decreased ,and then increased ,finally tended to be stable ;field capacity had a tend of grad‐ual decrease and then increase ;available soil water increased at the beginning ,then slowly declined ,and finally reached the stable status .The soil bulk density above 40 cm of the subsoiling treatment was lower than that of other treatment .In the 20~50 cm soil layer ,the water holding capacity of subsoiling treatment was the highest ,while in the 60~80 cm soil layer ,that of subsoiling treat‐ment was the lowest .In the 0~10 and 40~80 cm soil layers ,the water supply capacity of the soil showed ：no-tillage 〉 subsoiling〉 conventional tillage .While in the 20~40 and 80~90 cm soil layers ,the water supply capacity of subsoiling treatment was the highest compared with other treatments .In 0~10 cm soil layer ,the saturated water content and field water holding capacity showed ：no-tillage 〉 subsoiling 〉 conventional tillage ;in 20~50 cm soil layer ,subsoiling 〉 no-tillage 〉conventional tillage;in 50~80 cm soil layer ,no-tillage 〉 subsoiling 〉 conventional tillage .Under the 80 cm soil layer ,subsoiling 〉 no-tillage 〉 conven‐tional tillage .The soil available water content of 0~10 cm soil layer of no-tillage treatment was significantly higher than that in other treatments ,while in 10~50 cm soil layer ,that of no-tillage treatment was the highest compared with other treatments .
出处
《中国农村水利水电》
北大核心
2016年第9期35-39,45,共6页
China Rural Water and Hydropower
基金
国家自然科学基金项目(U1404404)
河南省农业科学院优秀青年科技基金项目(2016YQ12)
国家"863"计划项目(2013AA102904)
关键词
免耕
深松
土壤剖面
土壤物理
no-tillage
subsoiling
soil profile
soil physics
