期刊论文

中文

土壤通报

0564-3945

2005

36

2

181-184

10.3321/j.issn:0564-3945.2005.02.009

湖南农业大学***基金资助项目的部分研究内容.；

本校为第一机构

通过22年长期定位试验,研究了红壤性水稻土有机质的含量及其结合形态在3种稻作制、3种有机肥施用水平及2种地下水位深度条件下的长期演变规律,结果表明:红壤旱土改水田后,土壤有机质含量逐渐增加,各处理平均增长15.2g kg-1,增长率达98.9%.不同稻作制间,以稻-稻-冬泡处理土壤有机质增长幅度最大,21年共增加了18.0g kg-1,增长率达116.9%;稻-稻-冬绿处理次之,共分别增长15.8g kg-1和102.6%;稻-稻-冬油处理最低,仅分别增长11.9g kg-1和77.3%.不同有机肥施用水平间,以高量有机肥处理土壤有机质增长最快,21年共增加了17.9g kg-1,增长率为116.2%;常量有机肥处理次之,共分别增加16.1g kg-1和104.5%;化肥...

A long-term field experiment was carr ie d out to study the changes of organic matter (O.M.) and combined forms of humus in paddy soil derived from red soil under 3 rice-based cropping systems, 3 apply ing rates of green manure and 2 ground-water levels. The results showed the cont ent of organic matter was increased gradually when upland soil was puddle and cr opped under submerged conditions. Among the different rice-based cropping system s, the increase rate of O. M. in the treatment of rice-rice-flooded fallow in winter was the highest, that in the treatment of rice-rice-astragalus came th...