【摘要】 研究了白三叶草（豆科）和黑麦草（禾本科）轮作、自三叶草连作以及鸡脚草（禾本科）连作三种不同种植方式对红壤碳、氮的影响。结果表明:三种方式都较大幅度地增加土壤耕层的全碳和全氮;提高腐殖质的H/F 比、降低胡敏酸的 E₄/E₆比、改善了土壤腐殖质品质;同时提高了土壤有机无机复合量,松结态碳占结合态碳的比例和酸解性氮占全氮的比例,降低有机质氧化稳定性,有利于土壤对养分的保蓄和释放。其影响程度以禾本科、豆科牧草轮作>豆科牧草连作>禾本科牧草连作。种植不同牧草对亚耕层红壤的养分没有明显的影响。更多还原

【Abstract】 The effects of three different cropping patterns of herbages on characteristics of C and N of red soil were studied.The cropping patterns were:rotation of Trifolium repens L and Lolium mutiflorum Lam,succession crop- ping of Trifolium repeas L and succession cropping of Dactylis glomerata L.The results indicated that all three patterns increased the total C and N content,HA/FA ratio and degree of humification in cultivated horizon（0-15 cm）, decreased the E₄/E₅ ratio of humic acid,improved the humus quality of red soil.In addition,the compound content of organo-mineral complex,the ration of loose combined carbon to total combined carbon and the ratio of acid solu- ble-N to total N were raised,the Kos was reduced.All these treatments were favorable to the preserving and supply- ing of soil nutrients.The degree of effects were rotation of Trifolium repens L and Lolium mutiflorum Lam>succession cropping of Trifolium repens L>succession cropping of Dactylis glomerata L.There were no apparent effects on the sub- cultivated horizon（15-30 cm）.更多还原