不同氮肥处理下滴灌棉花气孔导度与土壤体积含水率的响应特征

Response Characteristics between Drip Irrigation Cotton Stomatal Conductance and Volumetric Water Content under Different Nitrogen Fertilizer Applications

通过滴灌盆栽试验,研究了不同生育期不同施氮水平条件下滴灌棉花气孔导度与土壤体积含水率之间的响应特征。结果表明,N2(2g/盆)、N4(4g/盆)、N6(6g/盆)水平下,蕾期时滴灌棉花气孔导度与土壤体积含水率负相关,相关系数分别为-0.975、-0.914、-0.967;N2、N6处理拟合模型分别为指数函数和线性函数,决定系数(R2)分别为0.985和0.936,达极显著水平。N2、N4、N6水平下,花铃期时滴灌棉花气孔导度与土壤体积含水率正相关,相关系数分别为0.859、0.980、0.944;N4处理拟合模型为指数函数,决定系数(R2)为0.997,达极显著水平;因此,研究的函数模型可以很好地描述滴灌棉花气孔导度与体积含水率的相关关系。

The potting experiments under drip irrigation were adopted to study the response characteristics between cotton stomatal conductance and soil volumetric water content under different Nitrogen fertilizer levels in different growth periods.The results showed that under the treatments of N2,N4,N6 in the bud stage,there was a negative relationship between cotton stomatal conductance and soil volumetric water content with the relative coefficients（r）of-0.975,-0.914,-0.967respectively;the determination coefficients（R^2）of fitted models were 0.985,0.806,0.936,of which treatments of N2,N6 were in the great significant level and their fitted models were index and linear models.Under the treatments of N2,N4,N6 in the blooming period,there was a positive relationship between cotton stomatal conductance and soil volumetric water content with the relative coefficients（r）of 0.859,0.980,0.944respectively;the determination coefficients（R^2）of fitted models were 0.850,0.997,0.890,of which N4 treatment was in the great significant level and its fitted model was index model.