不同局部根区供水对棉花生长与水分利用过程的调控效应

 【目的】为了阐明根系分区交替灌溉对主根系作物生长和水分利用的调控机制。【方法】以温室盆栽棉花为试验材料，研究了全部根区均匀灌溉（BRI）、根系分区交替灌溉（APRI）、固定部分根区灌溉（FPRI）3种灌水模式对棉花生长发育和水分利用过程的影响。【结果】结果表明，根系分区交替灌溉可诱发棉花叶片的水分保护机制，在不明显降低光合速率的条件下降低植株叶片的奢侈蒸腾耗水，提高水分利用效率；根系分区交替灌溉可增强棉花的渗透调节能力，使叶片保持较高的膨压。【结论】根系分区交替灌溉能够调整作物营养生长与生殖生长的关系，有效控制作物生长冗余，调节光合产物在根冠间的比例和分配，棉花应用根系分区交替灌溉技术可优化根冠比，刺激根系生长和吸收功能的补偿效应。

Response of Cotton Growth and Water Use to Different Partial Root Zone Irrigation

【Objective】The objective of this study is to evaluate the effect of alternate partial root zone irrigation on taproot crop growth and its water use. 【Method】Potted cotton (Gossypium hirsutum cv Shaan 392) experiment was conducted in green house to investigate the response of growth and water use of with three partial root zone irrigation patterns i. e., alternate partial root zone irrigation (APRI), fixed partial root zone irrigation (FPRI) and whole root zone irrigation.【Result】The results showed that APRI reduced ‘luxury’ transpiration without much reduction in photosynthesis rate by slightly limiting stomatal opening. Leaf water potential showed that cotton under APRI had more ability of osmotic regulation to maintain higher leaf turgor. 【Conclusion】It suggested that APRI has great potential to save water and also maintain the balance between vegetative and reproductive growth with reduced redundancy growth. It regulated the distribution of photosynthesis products and ratio between root and shoot. Meanwhile, the compensating effects of root growth and hydraulic conductivity were also observed