不同氮水平处理下滴灌棉花气孔导度与土层田间持水率之间的响应特征.docVIP

不同氮水平处理下滴灌棉花气孔导度与土层（10 cm）田间持水率之间的响应特征 　　摘 要：为了揭示滴灌棉花节水节肥效果，为滴灌棉花节水节肥提供技术参数和理论依据，以新陆早42号为试验材料，采用滴灌盆栽试验，研究滴灌棉花气孔导度与土层（10 cm）的田间持水率之间的响应关系，获得蕾期和花铃期不同施N水平条件下其相关性和模型。结果表明，在蕾期不同处理纯N分别为2，4，6 g?盆-1的条件下，气孔导度与土层10 cm的田间持水率之间呈负相关关系，相关性系数（r）分别为-0.859，-0.863，-0.934，T检验显著水平P为0.062，0.059，0.020;6 g?盆-1处理的拟合模型为线性函数，模型拟合决定系数（R2）为0.872，F检验显著水平P为0.020，达到显著水平;花铃期，气孔导度与土层10 cm的田间持水率之间呈正相关关系，相关性系数（r）分别为0.918，0.750，0.867，T检验显著水平P为0.028，0.144，0.057;2 g?盆-1处理的拟合模型为指数函数，模型拟合决定系数（R2）为0.891，F检验显著水平P为0.016，达到显著水平。该函数模型很好地描述了滴灌棉花气孔导度与土层10 cm的田间持水率之间的相关关系，为内陆干旱区绿洲农业滴灌棉花耗水量的估算提供了新的计算方法和理论依据。 　　关键词：滴灌;盆栽;棉花;气孔导度;田间持水率 　　中图分类号：S562 文献标识码：A DOI 编码：10.3969/j.issn.1006-6500.2015.11.001 　　Response Characteristics between Drip Irrigation Cotton Stomatal Conductance and Field Capacity of 10 cm Soil Layer under Different Conditions of Nitrogen Fertilizers 　　ZHANG Jian-xin1， HE Jiang-yong1， SHI Rong-yuan2 　　（1. Institute of Irrigation and Water Conservancy and Soil and Fertilizer of Xinjiang Academy of Agricultural and Reclamation Sciences， Shihezi City， Xinjiang 832000，China; 2. Paotai Soil Improvement Test Station of Eighth Division， Xinjiang Production and Construction Corps， Shihezi City， Xinjiang 832066，China ） 　　Abstract： To reveal the water-saving and fertilizer-saving effect of the drip irrigation cotton and provide technical parameters and theoretical basis， the No.42 Xinluzao Cotton was taken as experimental material， the experimental method of drip irrigation potting was adopted to study the response relationship between the drip irrigation cotton’s stomatal conductance and the field capacity 10 cm beneath the ground， acquiring the correlation and model of the blossoming stage and the bud stage under different nitrogen fertilizer levels. The results showed that during the bud stage of cotton， there was negative correlation between stomatal conductance and field capacity 10 cm beneath the ground under the nitrogen fertilizer level of 2， 4， 6 g per pot（N）， and the relative coefficients