| 引用本文: | 朱 梅,胡晨帆,刘硕硕,等.水稻幼苗生长及水分利用效率最优的断根组合研究[J].灌溉排水学报,2025,44(7):10-17. |
| ZHU Mei,HU Chenfan,LIU Shuoshuo,et al.水稻幼苗生长及水分利用效率最优的断根组合研究[J].灌溉排水学报,2025,44(7):10-17. |
|
| 摘要: |
| 【目的】断根有利于作物生长和提高水分利用效率，但是水稻幼苗生长及水分利用效率最优的断根组合方式不明确。【方法】本研究以荆占“1”号和绿旱“639”水稻品种为研究对象，开展不同时间和不同强度双维度断根的水稻幼苗培育试验。在水稻种子萌发第7、9、11天对其进行断根尖1.5 cm、断根1/2和留根长2 cm双维度不同组合断根处理，以不断根为对照组。试验共设置8个处理，每个处理3个重复，检测水稻幼苗壮苗指数、根冠比、光合特性和水分利用效率等指标，选择7个检测指标通过隶属函数法对组合断根处理下的水稻幼苗的生长和水分利用效率进行综合分析评价。【结果】荆占“1”号在种子萌发第9天，断根尖1.5 cm处理下，幼苗生长及水分利用效率最佳；绿旱“639”在种子萌发第9天，断根长1/2处理下，幼苗生长及水分利用效率最佳。【结论】适时适度的根系修剪可促进水稻幼苗生长、提高水分利用效率，促进节水水稻栽培以及农业水资源可持续发展。 |
| 关键词: 水稻幼苗；断根组合；隶属函数法；水分利用效率 |
| DOI：10.13522/j.cnki.ggps.2025088 |
| 分类号: |
| 基金项目: |
|
| Optimal root pruning to promote growth and water use efficiency of rice seedlings |
|
ZHU Mei, HU Chenfan, LIU Shuoshuo, LIN Shimiao, LIU Jingzhe
|
|
School of Engineering, Anhui Agricultural University, Hefei 230036, China
|
| Abstract: |
| 【Background and Objective】Improving water use efficiency in agriculture is a critical to alleviating global water stress. As agriculture consumes approximately 62% of global water, optimizing agricultural water use is essential for sustainable resource management. In the soil-plant-atmosphere continuum (SPAC), water transport in soil-root system is a key water cycle component and has attracted increasing research attention. Recent studies have shown that rational an approximate root pruning can improve plant water use efficiency, offering promising strategies for water-efficient agriculture. However, study on root pruning in rice remains limited, with most studies focusing on either timing or intensity, while ignoring their combined effects. This study aims to address this gap.【Method】A field experiment was conducted using two rice varieties, Jingzhan 1 and Luhan 639. Root pruning was performed on the 7 th, 9 th, and 11 th day after germination by cutting the root at 1.5 cm from the root tip, removing half of the root, and retaining 2 cm root segment. An unpruned root treatment was the control. Overall, there were eight treatments, which were arranged in a randomized design with three replicates each. Key indicators such as seedling vigor index, root-to-shoot ratio, photosynthetic traits, and water use efficiency were measured during the. Using the membership function method, seven variables were used to comprehensively assess the impact of different pruning treatments.【Result】For the Jingzhan 1 variety, pruning the root at 1.5 cm from the root tip on the 9 th day after germination resulted in the greatest improvement in seedling growth and water use efficiency. For the Luhan 639 variety, removing half of the root on the 9 th day after germination produced the best results.【Conclusion】Root pruning, when applied at the optimal time and intensity, can significantly enhance rice seedling growth and water use efficiency. This study provides practical guidelines for improving water-efficient rice cultivation and contributes to the broader goal of sustainable agricultural water management. |
| Key words: rice seedlings; root cutting combination; membership function method; water use efficiency |
