不同复种轮作方式下麦田土壤呼吸速率响应曲面模型与土壤有机质质量分数变化

Research on Soil Respiration of Winter Wheat by Response Surface Methodology and Organic Carbon Mass Fraction in Soil under Different Rotation

以不同前茬处理的冬小麦为对象,研究水热综合因子对土壤呼吸的影响以及小麦播种前和收获后土壤有机碳质量分数变化。结果表明,在3种轮作模式中,温度和水分对土壤呼吸的影响均用二次多项式回归方程进行曲面拟合,能够解释57.75%~77.30%的呼吸响应值变化;麦-玉轮作中,小麦的土壤呼吸速率最大;麦-豆轮作中,小麦的土壤呼吸速率最低,其表层土壤有机碳的质量分数比另外两个轮作的高。

This study is to define the variations of soil respiration in winter field in different crop rotation and organic carbon mass fraction in soil before wheat sowing and after harvest.The aim to describe a model about soil respiration and environmental factors and provided the theoretical basis for planting patterns on emission reduction and sink increment.The results showed that the temperature and moisture on soil respiration with polynomial regression equation can explain 57.75%-77.30% of response values change;the soil respiration rate of wheat in wheat-maize rotation was larger than other crop rotations;the soil respiration rate of wheat in wheat-soybean rotation was the lowest in this three crop rotations,and the organic carbon content in soil was higher than the others.