Interannual carry-over effects of severe drought on field-grown young pear trees

IF 5.6 1区农林科学 Q1 AGRONOMY

Agricultural and Forest Meteorology Pub Date : 2025-03-27 DOI:10.1016/j.agrformet.2025.110502

Victor Blanco , Lee Kalcsits

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引用次数: 0

Abstract

Perennial fruit trees will likely face a severe drought during their lifespan as climate change places pressure on irrigation resources. Our understanding of carry-over effects of seasonal drought on physiological performance is limited. This research assessed the physiological effects of soil water deficit on three-year-old field-grown pear trees of the combination ‘D'Anjou’/OHxF.87 and then also evaluated the carry-over effects of the drought the next season even when no water limitations were present. The first season trees under drought stress decreased their midday stem water potential to values below -3.0 MPa, and reduced stomatal conductance and root hydraulic conductance by 72 and 37 % respectively, compared to fully irrigated trees, which greatly penalized their vegetative growth and belowground expansion. Early leaf senescence was observed in stressed trees which at the end of the season had a total leaf area seven times smaller (0.06 m²) compared to trees with no water restrictions (0.44 m²). The next season, when both treatments were equally irrigated, there were no differences in the stem water potential, with values above -1.0 MPa. However, stomatal conductance for trees that were water limited the previous year remained lower by 32 % compared to those that were fully irrigated both seasons. Trees submitted to drought stress the previous season had smaller leaves with smaller stomata the next season. Moreover, carbon isotope composition in stems and leaves of those trees resulted affected highlighting the lasting effect of the previous season on tree water relations. Our results show that one season of severe drought stress can produce carry-over effects on the physiological and morphological responses of the trees the next season. Recovery from severe droughts can take many seasons even when water limitations do not persist.

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严重干旱对大田育苗梨树的年际结转效应

由于气候变化对灌溉资源造成压力，多年生果树在其一生中可能会面临严重的干旱。我们对季节性干旱对生理表现的携带效应的理解是有限的。本研究评价了土壤水分亏缺对‘D’anjou’/OHxF组合3年大田梨树的生理影响。87 .然后评估下一季干旱的延续效应，即使没有水的限制。与充分灌溉相比，干旱胁迫下第一季树木中午茎秆水势下降至-3.0 MPa以下，气孔导度和根系水力导度分别下降72%和37%，严重损害了其营养生长和地下扩张。在季末，受胁迫的树木的总叶面积（0.06 m2）比未受水分限制的树木（0.44 m2）小7倍（0.06 m2）。下一季，两种处理同等灌溉时，茎水势无差异，均在-1.0 MPa以上。然而，与两个季节都充分灌溉的树木相比，前一年水分限制的树木气孔导度仍然低32%。前一季遭受干旱胁迫的树木下一季叶片变小，气孔也变小。此外，这些树木的茎叶碳同位素组成也受到影响，突出了前一季节对树木水分关系的持久影响。结果表明，一个季节的严重干旱胁迫会对下一季节的树木生理和形态反应产生结转效应。从严重干旱中恢复可能需要许多季节，即使水的限制不再持续。

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来源期刊

Agricultural and Forest Meteorology 农林科学-林学

CiteScore

10.30

自引率

9.70%

发文量

415

审稿时长

69 days

期刊介绍： Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published. Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.