摘要
通过２５季种植的长期定位试验，研究了稻麦轮作条件下不同耕作方式和培肥制度对土壤有机质和全氮质量分数的影响。免耕土壤０～５ ｃｍ土层的有机质和全氮质量分数稍高于耕翻土壤； ５～１５ ｃｍ的则有低于耕翻的趋势； １５～３０ ｃｍ的无明显规律。长期休闲的土壤在整个耕层有明显的有机质和氨素累积，其中碳的累积快于氮的累积，免耕条件下比耕翻条件下累积量更大。 ０～５ ｃｍ和５～１５ ｃｍ土层有机肥与无机肥配施的处理，其有机质和全氮质量分数均显著高于单施化肥处理和不施肥处理，但均低于休闲处理； １５～３０ ｃｍ土层各培肥处理则无明显差异；单施化肥的土壤有机质和全氮质量分数高于不施肥处理，但这种差异只在表层（ ０～５ ｃｍ）较显著。
The effects of different tillage methods and fertilization on soil organic matter and total nitrogen content was studied by a long-term experiment lasting for growing twenty-five crops. Organic matter (OM) and total N (TN) content were slightly higher in the depth from 0 to 5 cm of no-billed soils than tilled soils. The reverse was true in the depth from 5 to 15 cm. No evident regularity was found in the depth from 15 to 30 cm. There was an obvious accumulation of OM and TN in the top 30 cm of the fallowed soils, of which the accumulation of OM was faster than that of TN and there was more accumulation in no-tillage compared tO tillage. Soils applied with inorganic and organic fertilizers had much more OM and TN at 0～5 cm and 5～15 cm depth than soils applied with only inorganic fertilizers and soils without fertilization (CK). However, OM and TN in these treatments were less than that in fallow treatment. No significant differences in OM and TN contents were found between fertilization treatments. Only in the 5 cm of top soils, OM and TN of the soils treated with only inorganic fertilizers were more than that of CK.
出处
《土壤与环境》
CSCD
2000年第1期27-30,共4页
Soil and Environmental Sciences
基金
国家自然科学基金重点项目!(39430090)
国家自然科学基金项目!(33880537)
关键词
稻麦轮作
耕作方式
剖肥制度
有机质
全氮
rice-based cropping system
tillage management
fertilization
organic matter
total N
