微咸水膜下滴灌对绿洲棉花生长特征与产量的影响

Influence of Drip Irrigation under Film with Brackish Water on Physiological Characteristics and Yield of Oasis Cotton in Xinjiang Tarim Basin

通过在微咸水膜下滴灌方式对绿洲棉花生长特征与产量的研究表明:棉花具有一定的耐盐性,当矿化度在一定范围,即轻度盐分胁迫对棉株株高、叶面积指数、单株总干物质积累量及干物质积累速率、根冠比、产量及水分利用效率影响不大,但重度盐分胁迫对这些指标影响较大。产量的降低主要原因:咸水灌溉使棉花单位面积结铃数明显减少,而对于棉花单铃重的影响相对较小。为新疆绿洲将来大面积开发利用该地区地下咸水提供数据支持,对微咸水膜下滴灌棉花管理具有一定的初步指导意义。

The results of study on physiological characteristics and yield of oasis cotton in Xinjiang Tarim basin under the condition of drip irrigation under film with brackish water show that cotton has certain salt-tolerant capability.When the salinity degree is in certain scope,the influences of the mild salt stress on the plant height,leaf area index,total dry matter accumulation quantity per plant and dry matter accumulation rate,root-shoot ratio,yield and water use efficiency of cotton are not obvious,but severe salt stress has great influence on these indexes.The main reason is that cotton boll numbers per unit area significantly reduces under salt-water irrigation,while the influence on weight of single boll is minor.The research result will provide data support for the large-area development and utilization of underground brackish water in Xinjiang oasis and the cotton irrigation management under the condition of drip irrigation under film with brackish water.