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生态学杂志 ›› 2024, Vol. 43 ›› Issue (12): 3648-3655.doi: 10.13292/j.1000-4890.202412.026

• 研究报告 • 上一篇    下一篇

互花米草对遮荫和刈割的光合响应

吕江溶1,2,游惠明3,周亚圣4,梁瀞文1,2,游巍斌1,2,何东进1,2,5*   

  1. 1福建农林大学林学院, 福州 350002; 2福建省南方森林资源与环境工程技术中心, 福州 350002; 3福建省林业科学研究院, 福州 350012; 4闽江学院, 福州 350100; 5福建农业职业技术学院, 福州 350119)

  • 出版日期:2024-12-10 发布日期:2024-12-06

Photosynthetic response of Spartina alterniflora to shading and mowing.

LYU Jiangrong1,2, YOU Huiming3, ZHOU Yasheng4, LIANG Jingwen1,2, YOU Weibin1,2, HE Dongjin1,2,5*   

  1. (1College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2Fujian Province South Forest Resources and Environment Engineering Technology Research Center, Fuzhou 350002, China; 3Fujian Academy of Forestry, Fuzhou 350012, China; 4Minjiang University, Fuzhou 350100, China; 5Fujian Vocational College of Agriculture, Fuzhou 350119, China).
  • Online:2024-12-10 Published:2024-12-06

摘要: 为揭示互花米草对遮荫和刈割处理的光合响应机制,本研究测定了不同组合处理(0%遮荫+不刈割、0%遮荫+刈割、30%遮荫+不刈割、30%遮荫+刈割、50%遮荫+不刈割、50%遮荫+刈割、70%遮荫+不刈割、70%遮荫+刈割、90%遮荫+不刈割、90%遮荫+刈割)互花米草的日均光合速率、最大净光合速率、光补偿点、暗呼吸速率、叶绿素a、叶绿素b及类胡萝卜素等7项指标。结果表明:遮荫极显著抑制了互花米草的日均光合速率(P<0.01),随遮荫强度增加,日均光合速率下降,而叶绿素a及类胡萝卜素含量则正好相反,随遮荫强度增加而显著增加(P<0.01);刈割处理极显著抑制了互花米草的日均光合速率、叶绿素a、叶绿素b及类胡萝卜素含量(P<0.01);遮荫刈割交互处理对互花米草光补偿点影响显著(P<0.05),但对其他指标影响不显著。主成分分析得出,90%遮荫+不刈割处理下对互花米草光合作用抑制最强。


关键词: 互花米草, 遮荫, 刈割, 光合特性, 主成分分析

Abstract: To reveal the photosynthetic response mechanism of Spartina alterniflora to shading and mowing, we investigated the effects of different treatments (0% shading + no mowing, 0% shading + mowing, 30% shading + no mowing, 30% shading + mowing, 50% shading + no mowing, 50% shading + mowing, 70% shading + no mowing, 70% shading + mowing, 90% shading + no mowing, 90% shading + mowing) on the photosynthetic characteristics of S. alterniflora. Seven photosynthesis-related indices were measured, including daily average photosynthetic rate, maximum net photosynthetic rate, light compensation point, dark respiration rate, chlorophyll a, chlorophyll b, and carotenoids. The results showed that shading significantly inhibited daily average photosynthetic rate (P<0.01), which decreased with increasing shading intensity. The contents of chlorophyll a and carotenoids increased significantly with increasing shading intensity (P<0.01). Mowing significantly inhibited daily average photosynthetic rate, chlorophyll a, chlorophyll b, and carotenoid content (P<0.01). Shading and mowing interacted to affect light compensation point of S. alterniflora (P<0.05), but did not affect other indices. Principal component analysis revealed that the combination treatment of 90% shading and no mowing exhibited the strongest inhibition on photosynthetic activities of S. alterniflora.


Key words: Spartina alterniflora, shading, mowing, photosynthetic characteristics, principal component analysis