互花米草对遮荫和刈割的光合响应  

Photosynthetic response of Spartina alterniflora to shading and mowing

作　　者：吕江溶 游惠明[3] 周亚圣 梁瀞文 游巍斌[1,2] 何东进 LYU Jiangrong;YOU Huiming;ZHOU Yasheng;LIANG Jingwen;YOU Weibin;HE Dongjin(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Fujian Province South Forest Resources and Environment Engineering Technology Research Center,Fuzhou 350002,China;Fujian Academy of Forestry,Fuzhou 350012,China;Minjiang University,Fuzhou 350100,China;Fujian Vocational College of Agriculture,Fuzhou 350119,China)

机构地区：[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　　处：《生态学杂志》2024年第12期3648-3655,共8页Chinese Journal of Ecology

基　　金：福建省自然科学基金项目(2022J01575);福建省林业科技项目(2022FKJ04);福建省科技厅引导性项目(2015N0018)资助。

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。To reveal the photosynthetic response mechanism of Spartina alterniflora to shading and mowing,we in⁃vestigated 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 mow⁃ing,70%shading+mowing,90%shading+no mowing,90%shading+mowing)on the photosynthetic charac⁃teristics of S.alterniflora.Seven photosynthesis⁃related indices were measured,including daily average photosyn⁃thetic rate,maximum net photosynthetic rate,light compensation point,dark respiration rate,chlorophyll a,chlo⁃rophyll 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 in⁃creased significantly with increasing shading intensity(P<0.01).Mowing significantly inhibited daily average pho⁃tosynthetic 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.

关 键 词：互花米草 遮荫 刈割 光合特性 主成分分析 

分 类 号：Q945.11[生物学—植物学]