摘要
为了解免耕稻鸭复合系统生态学特性,对该系统的土壤理化性状进行了研究.结果表明,(1)免耕抛秧养鸭、免耕抛秧不养鸭、翻耕抛秧不养鸭处理对土壤物理性状有着不同的影响.经过一季免耕养鸭,稻田0～5cm土层的体积质量降低了0.013g/cm3.免耕抛秧不养鸭,土壤体积质量增加了0.012g/cm3.翻耕不养鸭处理土壤体积质量变化不大.土壤非毛管孔隙在免耕处理中有所增加,免耕抛秧养鸭和免耕抛秧不养鸭在0～5cm土层分别较翻耕抛秧不养鸭增加3.13%和2.75%,在5～15cm处分别增加1.05%和0.92%.在0～5cm土层处,免耕养鸭能显著降低土层体积质量,显著增加土壤非毛管孔隙度,其影响的程度均达到显著水平,但对土壤总孔隙度影响不显著.在5～15cm土层处,翻耕不养鸭处理中的非毛管孔隙度显著低于免耕养鸭和免耕不养鸭处理,它们之间的体积质量和总孔隙度差异不显著.(2)对免耕养鸭复合系统土壤的化学性质分析表明,免耕养鸭有利于土壤中有机碳、全氮、碱解氮的提高,但有效磷和速效钾有降低的趋势.
A study on the soil physical and chemical characteristic of no-tillage-based r ice-duck complex system shows that: (1)NCD (no-tillage cast-transplanted with duck treatment),NCND(no-tillage cast-transplanted without duck treatment)a nd CCND(conventional-tillage cast-transplanted without duck treatment) have d ifferent effect on soil physical. For the soil volume weight, after one quar ter of no-tillage and raising ducks, the soil volume weight among 0～5 cm dust reduc ed 0.013 g/cm^3,NCND, it increases 0.012 g/cm^3, in the CCND, it does changed but not significantly. For the soil non-capillary porosity, compared with CCND, in NCD, it increases 3.13% among 0～5 cm dust, and increases 1.05% among 5～15 cm dust respectively;in NCND, it increases 2.75% among 0～5 cm dust,and increases 0.92% among 5～15 cm dust respectively. For 0～5 cm dust in NCD,NCND and CCND, no-tillage in rice-duck complex system decreases the soil volume we ight, and increases the soil non-capillary porosity significantly. It does not effect soil total porosity siginificantly. For 5～15 cm dust in NCD,NCND and CCN D , the soilvolume weight and the soil total porosity are not siginificantly diff erent except the soil non-capillary porosity. It can be concluded that no-till age protects the soilstructure, avail gas improvement in soil and increase t he air proportion in soil. This soil physical character is good for methane oxi daza tion. (2) The change of soil chemical characteristic of no-tillage-based rice -duck complex system: through the chemical analysis of no-tillage-based rice -duck system, it can be found that no-tillage and raising ducks is useful to t he increase of organic carbon, full nitrogen, alkaline nitrogen, but has no effe ct on increasing quick-resulted phosphor and kalium. This phenomenon need to be explained by more experiments.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第1期24-28,共5页
Journal of Hunan Agricultural University(Natural Sciences)
基金
湖南省科技厅资助项目(00NYK1001)
关键词
稻鸭复合系统
免耕
土壤
物理性状
养分动态变化
rice-duck complex system
no-tillage
soil
physical characteristic
soil chemi cal characteristic
