广西弄拉峰丛洼地灌丛岩生优势种光合生理生态特征日变化研究  

Daily variation of photosynthetic ecophysiological characteristics of lithophytic shrub dominant species in peak cluster depressions of Nongla,Guangxi

作　　者：庞冬辉[1] 沈利娜[2] 蒋忠诚[2,3] 覃星铭[2] 梁铭忠[2,4] 吴孔运 邓艳[2] 尹辉[2] 

机构地区：[1]广西山区综合技术开发中心,广西南宁530023 [2]中国地质科学院岩溶地质研究所,广西桂林541004 [3]广西师范学院,资源与环境科学学院,广西南宁530023 [4]钦州学院,政治与经济系,广西钦州5350003 [5]陕西核工业地质局,陕西西安710024

出　　处：《中国岩溶》2010年第3期293-300,共8页Carsologica Sinica

基　　金：国家"十五"科技攻关课题(2006BAC01A10);国家科技支撑计划(2008BAD98B07);岩溶峰丛山地生态重建技术研究(桂科转0719005-2-3);广西岩溶石山区生态环境恢复重建技术开发与应用(桂科攻0816003-2);广西岩溶峰丛山区生态农业技术研究与示范(桂科攻010124005);区域环境保护与可持续发展研究与示范(桂科攻0816003-1-1-1);国家自然科学基金(40872214);广西自然科学基金(桂科基0638006-6;0639067);2009年度教育厅面上项目(200911MS142);国家重点基础研究发展计划项目(2006CB403207)

摘　　要：运用LI-6400测定弄拉峰丛洼地灌丛岩生优势种金银花、黄荆、红背山麻杆、裸花紫珠的光合生理生态特性,并比较它们的净光合作用速率、光合有效辐射等生理、生态指标日变化。结果表明,峰丛洼地灌丛群落生态环境因子日变化复杂,不同灌丛群落对小气候调控有差异。黄荆和红背山麻杆调控大气CO2浓度的能力最强。黄荆的平均净光合作用速率和平均蒸腾速率最大,红背山麻杆的水分利用效率和表观量子效率最高。金银花和裸花紫珠有明显的"午休"现象。生理因子受外界生态因子的制约,生态因子和蒸腾作用、气孔等生理因子共同作用影响光合生理作用,不同岩生优势种影响因子有差异。以逐步回归方式建立净光合作用速率和影响因子之间的回归方程模型,所有方程均有显著性意义和良好的预测性。Physiologic characters of Lonicera japonica,Vitex negundo,Alchornea trewioides and Callicarpa nudiflora and some other lithophytic shrub dominant species in NongLa peak cluster depression are measured by LI-6400 and their daily variations of physiologic and ecologic index,such as net photosynthetic rate（Pn）and photosynthetic active radiation,are compared with each other.It indicates that the daily variations of environment factors for lithophytic shrub community in peak cluster depressions are quite complicated,and that different shrub communities have different regulate and control effect to microclimate.The Vitex negundo and Alchornea trewioides communities can better adjust CO2 density in the air.The Vitex negundo community is of the highest average Pn level and average transpiration rate level,but the Alchornea trewioides community is of the highest average water use efficiency level and average apparent quantum efficiency level.The Lonicera japonica and Callicarpa nudiflora communities show obvious ＂midday depression＂ in photosynthesis.Plant physiological factors are restricted by environment factors.Environmental factors and plant physiological factors influence photosynthesis together but different factors influence differently in these lithophytic shrub dominant species.At the same time,stepwise regression method is used to establish linear regression equations for net photosynthetic rate and various factors.All of the linear regression equations are statistically significant and predict well.

关 键 词：峰丛洼地 灌丛岩生优势种 净光合作用速率 生理因子 生态环境因子 

分 类 号：Q945.11[生物学—植物学]