浙江农业学报 ›› 2024, Vol. 36 ›› Issue (4): 738-747.DOI: 10.3969/j.issn.1004-1524.20230517

• 作物科学 • 上一篇    下一篇

花铃期持续干旱胁迫对棉花生长与土壤干旱阈值的影响

杨明凤1,2(), 吉春容2,3,*(), 刘勇1, 白书军1, 陈雪4, 刘爱琳4   

  1. 1.乌兰乌苏农业气象试验站,新疆 石河子 832199
    2.中国气象局 乌鲁木齐沙漠气象研究所,新疆 乌鲁木齐 830002
    3.新疆兴农网信息中心(新疆维吾尔自治区农业气象台),新疆 乌鲁木齐 830002
    4.新疆农业大学 资源与环境学院,新疆 乌鲁木齐 830002
  • 收稿日期:2023-04-21 出版日期:2024-04-25 发布日期:2024-04-29
  • 作者简介:杨明凤(1985—),女,河南信阳人,硕士,高级工程师,研究方向为农林业气象灾害。E-mail:490109498@qq.com
  • 通讯作者: *吉春容,E-mail: jcr83@163.com
  • 基金资助:
    新疆维吾尔自治区自然科学基金(2021D01B13);中国沙漠气象科学研究基金(Sqj2020005);国家自然科学基金(41975146)

Effects of continuous drought stress on cotton growth and soil drought threshold at flowering and boll stage

YANG Mingfeng1,2(), JI Chunrong2,3,*(), LIU Yong1, BAI Shujun1, CHEN Xue4, LIU Ailin4   

  1. 1. Wulanwusu Agricultural Meteorological Experimental Station, Shihezi 832199, Xinjiang, China
    2. Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China
    3. Xinjiang Xingnong Network Information Center (Xinjiang Uygur Autonomous Region Agricultural Meteorological Observatory), Urumqi 830002, China
    4. College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830002, China
  • Received:2023-04-21 Online:2024-04-25 Published:2024-04-29
  • Contact: JI Chunrong

摘要:

为研究花铃期持续干旱胁迫对棉花生长的影响,以及土壤干旱阈值的定量表达和干旱阈值,以棉花品种新陆早78号为试验材料,在花铃期设计正常灌溉和不同程度干旱处理(正常灌溉用水量的90%、70%、50%、30%),测定不同处理下棉花光合作用、农艺性状和土壤相对含水量的变化规律。结果表明:各程度干旱处理与正常灌溉相比,土壤相对含水量、净光合速率、蒸腾速率、叶片相对含水量、株高、蕾铃干重等均下降,且下降幅度随干旱持续时间延长而增加,最终导致产量降低;棉花光合作用和农艺性状与土壤相对含水量变化相关,存在阈值反应;以减产5%、10%、20%作为临界点,将干旱程度D值与产量、干旱持续时间进行线性相关分析,确定轻度干旱阈值为0.253,中度干旱阈值为0.387,重度干旱阈值为0.655,且干旱胁迫程度越高,干旱阈值发生时间越早。研究确定了棉花花铃期不同程度干旱胁迫下的土壤干旱阈值指标及其发生时间,为棉花大田生产合理、及时调亏灌溉提供了参考。

关键词: 棉花, 干旱胁迫, 光合作用, 干旱阈值

Abstract:

To study the impact of continuous drought stress during the flowering and boll stage on cotton growth, as well as the quantitative expression and thresholds of soil drought, the cotton variety Xinluzao 78 was used as the experimental material. During the flowering and boll stage, different levels of drought treatments were designed (normal irrigation, and 90%, 70%, 50%, and 30% of the normal irrigation water amount), and the changes in cotton photosynthesis, agronomic traits, and soil relative water content under different treatments were measured. The results showed that compared with normal irrigation, soil relative water content, net photosynthetic rate, transpiration rate, leaf relative water content, plant height, and boll dry weight all decreased under different degrees of drought treatment, and the decrease was more significant as the duration of drought increased, ultimately leading to reduced yield. The photosynthesis and agronomic traits of cotton were correlated with changes in soil relative water content, showing a threshold response. By using a 5%, 10%, and 20% reduction in yield as the critical points, a linear correlation analysis was conducted between the drought degree D value, yield, and drought duration. The thresholds for mild drought, moderate drought, and severe drought were determined to be 0.253, 0.387, and 0.655, respectively, with higher levels of drought stress leading to earlier occurrence of drought thresholds. This study established the soil drought threshold indicators and their occurrence times under different levels of drought stress during the cotton flowering and boll stage, providing a reference for reasonable and timely deficit irrigation in cotton field production.

Key words: cotton, drought stress, photosynthesis, drought threshold

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