痕量灌溉对棉花根系活力·生物量累积与供水关系的影响

Effect of Trace Irrigation on the Relationship Between Root Vigour,Biomass Accumulation and Water Supply in Cotton

[目的]针对内蒙古阿拉善地区棉田生产中存在的水资源短缺、水分低效问题,采用痕量灌溉方式揭示痕量灌溉下棉花生长发育和水分利用效率对田间供水方式的响应机制。[方法]通过田间小区试验,研究痕量灌溉不同埋深和水量对棉花根系活力、生物量累积的影响。[结果]棉花根系生物量呈“S”形曲线增长;自苗期至吐絮期,棉花根系生物量整体呈增加的趋势。痕灌处理棉花根系活力较膜下滴灌(CK)处理均有所提高。T_(1)处理棉花根系活力最高,有助于促进根系下扎,形成合理的根系结构。[结论]蕾期和花铃期是植株快速生长期,灌溉供水是维持生育耗水的关键。

[Objective]To address the problems of water shortage and water inefficiency in cotton field production in the Alashan region of Inner Mongolia.Trace irrigation was used,and it was proposed to reveal the response mechanisms of cotton growth and development and water use efficiency to field water supply methods under trace irrigation.[Method]The effect of trace irrigation on the vigour and biomass accumulation of cotton roots was investigated in a field plot experiment with different burial depths and water volumes.[Result]Cotton root biomass showed an“S”type curve continuous growth;from the seedling stage to the spatulation stage,cotton root biomass showed an increase trend.The trace irrigation treatments all increased the root vigour of cotton compared with the sub-membrane drip irrigation(CK)treatment.T_(1)treatment had the highest root vigour,which helped to promote root undergrowth and create a reasonable root structure.[Conclusion]The bud stage and flowering and boll stage are the rapid growth periods of plants,and irrigation water supply is the key to growth water consumption during supporting period.