摘要
为了探讨不同灌水方式对土壤水分及棉花生育后期(盛铃期)光合-光响应曲线特征的影响,通过测坑试验,设定3种灌溉方式(膜下滴灌、地下滴灌、微润灌),利用PR2测定土壤水分状况,利用光能利用率的下降点来界定光合作用弱光区域,并采用直角双曲线修正模型拟合光合-光响应曲线。结果表明,土壤湿润体大小关系为:膜下滴灌>地下滴灌>微润灌,其中微润灌较地下滴灌土壤湿润体水分分布更均匀;界定后的光合作用弱光区域较传统区域增大;直角双曲线修正模型拟合结果相关度较高,且光合参数模拟值与实测值接近;灌溉用水量大幅减小的情况下,微润灌最大净光合速率为膜下滴灌处理的69.6%,为地下滴灌处理的88.1%,其节水潜力较大。
In order to investigate the effects of different irrigation methods on the soil moisture and characteristics of the photosynthesis light-response curve in the full-boll stage of cotton,test-pit experiments were set under three irrigation methods,the soil moisture was measured by PR2,the weak light region was defined by the decrease pointof light energy utilization curve,and photosynthesis light-response curve was fitted by modified rectangular hyperbola mode.The results showed that,the maximum wetted soil volume was from mulched drip irrigation,the wetted soil volume from moistube-irrigation had a more uniform distribution of soil moisture than underground drip irrigation;the defined weak light region was larger than the traditional;the correlation degree of fitted result of modified rectangular hyperbola mode was relatively high,and photosynthetic parameterssimulated were closed to measured;the maximum net photosynthesis rate of moistube-irrigation was 69.6% of mulched drip irrigation treatment,and 88.1% of underground drip irrigation treatment,when the consumption of irrigation water greatly reduced.So moistube-irrigation has great potential to saving water.
出处
《灌溉排水学报》
CSCD
北大核心
2016年第6期26-30,共5页
Journal of Irrigation and Drainage
基金
新疆水利科技专项经费项目(2015G08)
水利部公益性行业科研专项经费项目(201301102)
新疆维吾尔自治区科技计划项目(201130103-5)
关键词
棉花
灌溉方式
微润灌
光响应曲线
cotton
irrigation method
moistube-irrigation
light-response curve
