摘要
为了明确尿素和秸秆添加对茶园土壤CO_2和N2O排放的影响,为茶园合理施肥提供理论依据,本研究在室内培养条件下,以华中地区红壤丘陵区茶园土壤为对象,运用静态培养系统研究方法,研究该土壤在尿素输入和作物秸秆添加后CO_2和N_2O的排放特征。培养试验共设置对照、尿素、作物秸秆和尿素+作物秸秆4种处理。结果表明:不同处理下华中地区茶园土壤CO_2和N_2O排放呈显著差异。作物秸秆添加显著提高茶园土壤CO_2的排放,作物秸秆和作物秸秆+尿素处理分别是对照的5.57和4.99倍。尿素输入显著促进茶园土壤N_2O的排放,而秸秆添加却降低N_2O的排放。对照和添加尿素处理土壤N_2O排放通量与铵态氮含量呈显著正相关关系。无秸秆添加处理土壤N_2O排放通量与硝态氮含量呈显著的相关性,而添加秸秆处理二者无显著相关关系。土壤可溶性有机碳含量对CO_2排放有显著影响,二者之间呈极显著线性正相关关系。
In order to study the effect of urea and straw application on CO2 and N2O emission in tea field soiland provide theory basis for the rational fertilization, hilly area tea field of red soil in central China was took asstudy object, the emission characteristics were studied after the application of CO2 and N2O by the method ofstatic culture system under indoor incubation condition. Four different treatments（control, urea, crop straw andurea ＋ crop straw） were designed. The results showed that soil CO2 and N2O emission presented significantdifferences among four different treatments. The application of crop straw could remarkably promote soil CO2 emission, soil CO2 emissions were 5.57 and 4.99 times higher than CK after the application of crop straw andurea ＋ crop straw respectively. The application of urea could significantly promote N2O emission in the tea fieldsoil, but the application of crop straw reduced soil N2O emission. There was a significantly positive correlationbetween the N2O emissions amount of CK and urea treatments and the NH4＋-N content. The soil NO3--Ncontent had a close relationship with N2O emission of the treatment without crop straw application, while the NO3--N content and N2O emission of the treatment with crop straw had no significant correlation. Soil solubleorganic carbon（DOC） had significant impact on CO2 emission, the two had a significantly linear positivecorrelativity.
出处
《中国农学通报》
2015年第36期211-219,共9页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金项目"茶园土壤N2O排放特征及其关键调控因子"(41201255)
中央高校基本科研业务费专项资金资助项目"稻草还田对土壤反硝化过程与土壤氮素有效性的影响研究"(2013PY114)
公益性行业(农业)科研专项经费项目"华北区域土壤肥力特性及综合培肥技术"(201203030-5)
