山西农业大学学报（自然科学版）2026，Vol.46Issue(2)：87-98,12.DOI:10.13842/j.cnki.issn1671-8151.202504022
固定灌水定额下过大灌水间隔抑制棉花生长及产量形成
Excessive irrigation intervals inhibit cotton growth and yield formation under fixed irrigation quota
摘要
Abstract
[Objective]To clarify the impact of irrigation intervals on cotton yield and water use efficiency(WUE)under fixed ir-rigation quotas,this study analyzed the dynamic responses of cotton growth to uncover the physiological mechanisms regulating yield and WUE.These findings provide a theoretical basis for high-yield and high-efficiency drip-irrigated cotton production.[Methods]A two-year(2023-2024)field experiment was conducted at the Water Conservancy Irrigation Experimental Station in Bozhou,Xinjiang.Four irrigation interval gradients were designed:10 d(CK,control),15 d(W1),20 d(W2),and 25 d(W3).The responses of cotton leaf area,root-to-shoot ratio,dry matter accumulation,yield,and WUE to different irrigation intervals were quantitatively analyzed,and the key factors causing variations in yield and WUE were identified.[Results]In the 2-year experiment,the Leaf Area Duration(LAD)of cotton at each growth stage consistently followed the trend of CK>W1>W2>W3.Additionally,a logistic growth curve was established to reflect the growth status of cotton leaves.The results indi-cated that when the irrigation interval exceeded 15 days,the maximum growth rate of cotton leaves decreased by 4.06%～45.49%,while the effective leaf area growth period was extended by 8 to 13 days.When the irrigation interval exceeded 15 days,both the maximum aboveground dry matter accumulation rate and the maximum aboveground dry matter accumulation showed significant declines,with reductions of 18.13%～50.96%and 17.07%～83.73%,respectively.The root-to-shoot ra-tio of each treatment increased with the increase of irrigation intervals,with the W3 treatment showing a 4.73%～65.08%in-crease compared to the other treatments.Cotton yield and its components also exhibited trends consistent with the changes in dry matter accumulation.When the irrigation interval exceeded 15 days,the yield reduction ranged from 19.73%～93.26%.WUE exhibited an"initial increase followed by decrease"trend,whereas irrigation water use efficiency(IWUE)showed a"in-crease-decrease-increase"pattern.Structural equation modeling(SEM)demonstrated that irrigation intervals not only directly affected yield and WUE,but also indirectly influence them through their direct effects on leaf area and aboveground dry matter.[Conclusion]When the irrigation intervals was greater than 15 days,cotton leaf area and dry matter accumulation were signifi-cantly negatively affected,ultimately leading to a reduction in yield and water use efficiency.关键词
灌水间隔/棉花/根冠比/结构方程模型Key words
Irrigation interval/Cotton/Root-shoot ratio/Structural equation model分类
农业科技引用本文复制引用
张钊,张余益,樊宜,唐和敬,赵家钰,王子翔,刘战东..固定灌水定额下过大灌水间隔抑制棉花生长及产量形成[J].山西农业大学学报（自然科学版）,2026,46(2):87-98,12.基金项目
国家科技基础资源调查专项课题(2022FY101601) （2022FY101601）
中央引导地方科技发展资金项目(ZYYD2025QY02) （ZYYD2025QY02）
新疆维吾尔自治区"天池英才"人才引进计划(2024) （2024）
