摘要
为给江苏省耕地地力的保持和培育提供基础数据,以分布于江苏全省的297个土壤监测点为研究对象,研究了江苏省域不同农区土壤碳氮分布,并对其影响因素进行了分析。结果表明土壤类型、农区分布、施肥类型及施肥量、种植制度和还田秸秆量对土壤碳氮分布具有重要影响:(1)水稻土、黄棕壤、砂姜黑土、潮土、棕壤、潮盐土的土壤有机质和氮含量依次减少。(2)在水稻土中,徐淮、里下河、沿江等农区土壤有机质和氮含量较高,而太湖和丘陵农区次之,沿海农区最低;潮土中徐淮、里下河和丘陵农区土壤有机质和氮含量较高,而太湖农区、沿江农区次之,沿海农区最低;黄棕壤中太湖农区土壤有机质和氮含量较高,而丘陵农区较低;潮盐土中徐淮农区土壤有机质和氮含量最高,里下河农区次之,沿江农区最低。(3)同一种土壤中,有机肥施用量高的土壤碳氮含量较高。(4)在同一种土壤中,种植蔬菜、大量粮食作物(小麦、水稻、玉米等)、块根旱作作物(马铃薯等)、茶叶等的土壤碳氮含量依次降低。
In order to provide basic data for arable land conservation and cultivation in Jiangsu province, the distri-bution of soil carbon and nitrogen in different farming region were studied in 297 soil monitoring sites located around Jiangsu province, and the influencing factors were analyzed as well. The results showed that the soil type, the distribution of farm-ing regions, fertilizer type and amount of fertilizer, cropping systems and the amount of returned straw played major roles in the distribution of soil carbon and nitrogen. Soil organic matter and nitrogen content decreased in the orders of paddy soil, yellow brown soil, lime concretion black soil, alluvial soil, brown soil and alluvial-salty soil. In paddy soils, the farming-nbsp;regions of Xuhuai, Lixiahe and Yangtze River bank presented higher soil organic matter and nitrogen content, followed by the farming regions of Taihu and hilly areas, and coastal farming region took the lowest. In alluvial soil, the highest content of soil organic matter and nitrogen were observed in the farming regions of Xuhuai, Lixiahe, and hilly area, and the lowest in coastal farming region; In yellow brown soil, the higer content of soil organic matter＆amp;nbsp;and nitrogen appeared in Taihu farming region, and the lower in hilly farming region. In alluvial-salty soil, the highest val-ue appeared in Xuhuan farming region showed the highest value, followed by Lixiahe farming region, and Yangtze River bank farming region was the lowest. In the same kind of soil, the contents of soil carbon and nitrogen were increased with the application of organic fertilizer. In the same kind of soil, the contents of soil carbon and nitrogen decreased in the or-ders of planting vegetables, planting food crops （ wheat, rice, corn, etc. ） , potatoes and other root crops, and tea.
出处
《江苏农业学报》
CSCD
北大核心
2014年第5期1028-1036,共9页
Jiangsu Journal of Agricultural Sciences
基金
江苏省农业科技自主创新基金项目[CX(12)3037]
IPNI国际合作项目(JIANGSU-10)
公益性行业(农业)科研专项经费项目(201003014-1-2)
关键词
碳氮分布
农区
土壤类型
施肥
distribution of soil carbon and nitrogen
farming region
soil type
fertilization
