烟草科技2016，Vol.49Issue(3)：10-16,7.DOI:10.16135/j.issn1002-0861.20160302
不同类型秸秆还田对烟田土壤碳氮矿化的影响
Effects of different types of straw and stalk returning on carbon and nitrogen mineralization in tobacco soil
摘要
Abstract
In order to evaluate the supply capacities of carbon and nitrogen nutrients in tobacco fields by different types of straw and stalk returning, the influences of corn stalk, tobacco stalk, rice straw and rice straw biochar on the organic carbon and nitrogen mineralization and nitrification in soils of tobacco fields were studied via aerobic incubation in laboratory. The results showed that: after applying different straws and stalks at 1% by weight, the soil organic carbon mineralization rate and its cumulative mineralization were in the order of corn stalk≥rice straw≥tobacco stalk≥rice straw biochar≥the control (without stalk or straw returning). At the same applying rate, the organic carbon mineralization rate and its cumulative mineralization in soils treated with rice straw biochar were significantly lower than those with rice straw. After applying the different straws and stalks, the organic nitrogen mineralization rate and nitrification rate in soils changed in similar trends, i.e. reducing first then slowly increasing and reaching a steady state. However, the nitrification rate and mineralization rate in soils treated with different straws were negative at the early incubation stage, which might be related to soil denitrification and nitrogen immobilization by soil microorganisms. Therefore, in the process of straw returning with high carbon/nitrogen ratio, proper exogenous nitrogen was needed to slow down the immobilization for facilitating soil nutrient release. Straw transformed into biochar, then returned in fields, which had better effects on carbon accumulation and nitrogen immobilization.关键词
烟田/秸秆还田/土壤/碳矿化/氮矿化/碳氮比Key words
Tobacco field/Straw returning/Soil/Carbon mineralization/Nitrogen mineralization/Carbon/nitrogen ratio分类
农业科技引用本文复制引用
张继旭,张忠锋,张继光,申国明,王瑞,高林,李志刚,戴衍晨,孟贵星,向必坤..不同类型秸秆还田对烟田土壤碳氮矿化的影响[J].烟草科技,2016,49(3):10-16,7.基金项目
中国烟草总公司科技重点项目“‘清江源’生态富硒特色烟叶生产关键技术研究与应用”（110201202014）；国家自然科学基金项目“不同种植模式烟草根际土壤微生物群落结构及其生物功能稳定性研究”（41201291）。 （）
