Scholarlink

<p>In recent years, moderate to severe water deficits due to climate warming in semi-arid regions have reduced crop productivity. Therefore, quantification of the impacts meteorological factors and soil moisture have on plant productivity is critical when assessing crop growth and sustainability in semi-arid regions. Field experiments conducted in 2021 and 2022 investigated the effects of drought duration on potato leaf photosynthetic characteristics. There were five treatments: drought stress with soil water at 55% (T<sub>1</sub>), 65% (T<sub>2</sub>), and 75% (T<sub>3</sub>) field water capacity; sufficient water (control) at 80% (T<sub>4</sub>), and waterlogging at 85% (T<sub>5</sub>). Soil moisture content (<i>W</i><sub>r</sub>) strongly affected potato photosynthesis. In 2022 (continuous drought for 23 days), drought stress had a greater effect on the potato leaf light response parameters than waterlogging. However, in 2021 (continuous drought for 29 days), both drought and waterlogging significantly affected the parameters. The critical points corresponding <i>W</i><sub>r</sub> for stomatal limitation were 67.5%, and 56.7% in 2022 and 2021, respectively. The increase in drought duration probably led to an increase in the potato water range required to meet the water demand for photosynthesis. The water threshold for potatoes in semi-arid areas was predicted using a model. The predicted soil water threshold ranges in 2021 were 30.9%–61.4% for low-yield and low-efficiency water, 61.4%–68.6% for middle-yield and low-efficiency water, 70.1%–96.3% for high-yield and high-efficiency water, which were greater than in 2022 because potato growth required more water due to the longer drought period. The results can improve soil water management under different drought durations.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Drought Duration Alters the Soil Water Threshold Corresponding to the Leaf Photosynthetic Efficiency of Potato in Semi-arid Regions

  • 期刊论文

  • 发表日期：

    2026年4月8日

查看全文
  • Yang Yang ,
  • Hong Zhao,
  • Shi-qiong Yang,
  • Di-hua Cai,
  • Kai Zhang,
  • Yu-rui Tang,
  • Yue Qi,
  • Peng-cheng Huang

摘要

In recent years, moderate to severe water deficits due to climate warming in semi-arid regions have reduced crop productivity. Therefore, quantification of the impacts meteorological factors and soil moisture have on plant productivity is critical when assessing crop growth and sustainability in semi-arid regions. Field experiments conducted in 2021 and 2022 investigated the effects of drought duration on potato leaf photosynthetic characteristics. There were five treatments: drought stress with soil water at 55% (T1), 65% (T2), and 75% (T3) field water capacity; sufficient water (control) at 80% (T4), and waterlogging at 85% (T5). Soil moisture content (Wr) strongly affected potato photosynthesis. In 2022 (continuous drought for 23 days), drought stress had a greater effect on the potato leaf light response parameters than waterlogging. However, in 2021 (continuous drought for 29 days), both drought and waterlogging significantly affected the parameters. The critical points corresponding Wr for stomatal limitation were 67.5%, and 56.7% in 2022 and 2021, respectively. The increase in drought duration probably led to an increase in the potato water range required to meet the water demand for photosynthesis. The water threshold for potatoes in semi-arid areas was predicted using a model. The predicted soil water threshold ranges in 2021 were 30.9%–61.4% for low-yield and low-efficiency water, 61.4%–68.6% for middle-yield and low-efficiency water, 70.1%–96.3% for high-yield and high-efficiency water, which were greater than in 2022 because potato growth required more water due to the longer drought period. The results can improve soil water management under different drought durations.