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为研究增温及秸秆施用对冬小麦田土壤呼吸和酶活性的影响,于2014-11~2015-05进行田间试验.设置对照、增温、秸秆施用、增温及秸秆施用这4个处理,观测了不同处理下土壤呼吸、土壤温度、土壤湿度(体积含水量)的季节动态,并在拔节期、孕穗期、扬花期观测了不同处理下的土壤脲酶、转化酶、过氧化氢酶活性.结果表明,对照、增温、秸秆施用、增温及秸秆施用这4个处理的季节平均土壤呼吸速率分别为1.46、1.96、1.92、2.45μmol·(m2·s)-1.方差分析表明,增温处理与对照、秸秆施用处理与对照、增温及秸秆施用处理与对照3对处理之间的季节平均土壤呼吸速率均存在显著差异(P<0.05).不同处理下土壤呼吸与土壤温度的关系均可用指数回归方程拟合,指数回归方程可分别解释对照、增温、秸秆施用、增温及秸秆施用这4个处理土壤呼吸34.3%、28.1%、24.6%、32.0%的变异.增温、秸秆施用比对照处理显著(P<0.05)提高了脲酶、转化酶、过氧化氢酶活性.土壤呼吸与脲酶活性存在线性回归关系,其P值为0.061,接近显著水平;土壤呼吸与转化酶(P=0.013)、过氧化氢酶活性(P=0.002)均存在极显著的线性回归关系.
In order to study the effects of warming and straw application on soil respiration and enzyme activity in winter wheat field, a field experiment was conducted from November 2014 to May 2015. The four treatments of control, temperature increase, straw application, temperature increase and straw application were observed. The seasonal dynamics of soil respiration, soil temperature and soil moisture (volumetric water content) under different treatments were observed and the soil urease, invertase and catalase activities under different treatments were observed at the jointing, booting and flowering stages.Results The results showed that the seasonal average soil respiration rates of the four treatments were 1.46, 1.96, 1.92 and 2.45 μmol · (m2 · s) -1, respectively. The analysis of variance showed that the increase of temperature There was significant difference (P <0.05) in the seasonal average soil respiration rate between treatments and control, straw application and control, warming and straw application and control. The relationship between soil respiration and soil temperature under different treatments Exponential regression equation can be used to fit the exponential regression equation can explain the control, warming, straw application, temperature and straw application of these four treatment of soil respiration 34.3%, 28.1%, 24.6%, 32.0% of the variation. Compared with the control, the straw application significantly increased (P <0.05) urease, invertase and catalase activities. The soil respiration and urease activity had a linear regression relationship with a P value of 0.061, which was close to a significant level. Soil respiration and invertase P = 0.013), catalase activity (P = 0.002) there is a very significant linear regression relationship.