摘要
采用尼龙网袋法,模拟小麦玉米种植模式,研究了不同水氮条件下冬小麦和夏玉米秸秆养分释放特征。研究表明,小麦秸秆和玉米秸秆腐解情况都表现为前期腐解快,后期腐解速度缓慢;室内培养条件下,腐解前20天为腐解快速期,腐解缓慢期大约为20~60天,其后为腐解停滞期。玉米秸秆腐解速度比小麦秸秆快。添加氮素对加快秸秆腐解有一定的效果。土壤含水量为16%和20%对秸秆腐解速度无影响。小麦与玉米秸秆中养分释放率均表现为K>P>C>N,小麦和玉米秸秆中养分的释放量均表现为C>K>N>P。
The nutrition decomposing characteristics of winter wheat straw and summer maize straw under different water and nitrogen levels was studied,with the method of nylon net bags to simulate the wheat-corn pattern.Research has shown that the release speed of both wheat and maize straw was fast early,slowly latter.Composing process included three phase by incubation experiment:accelerating phase(0-20days),deceleration phase(20-60days)and decline phase.The composing rate of maize straw was faster than wheat.Applying nitrogen fertilizer could accelerate the speed of composing,but none of soil moisture.The nutrient releasing rate was K,P,C and N from high to low,as well the quantity of nutrient release was C,K,N and P.
关键词
含水量
施氮量
秸秆还田
作物秸秆
养分释放
water content
nitrogen application
straw returning
crop straw
nutrient release
