茂兰喀斯特区68种不同功能(类)群植物比叶面积研究

Specific Leaf Area for 68 Species of Plant Functional Groups in Maolan National Nature Reserve

以喀斯特区68种典型植物为研究对象,通过对不同生长阶段植物叶面积、叶干重及比叶面积的测定和计算,分析了不同生活型、不同系统发育以及不同科植物比叶面积的变化特征。结果表明:茂兰喀斯特区68种植物叶面积、叶干重和比叶面积变化范围分别为4.28~223.63 cm^(2)、0.015~1.381 g和67.66~783.76 cm^(2)/g,变异系数均属强变异。比叶面积与叶干重呈极显著负相关(P<0.01),与叶面积则没有显著相关性(P>0.05)。不同生活型植物的比叶面积在各生长阶段均表现为:草本>灌木>乔木、落叶植物>常绿植物;不同生活型植物,草本、灌木及乔木的比叶面积分别在乔林样地、灌木灌丛样地、顶级群落样地中最高。不同系统发育在各生长阶段均表现为:蕨类植物>种子植物;不同科植物则均以卷柏科最高。从不同生长阶段来看,不同生活型、不同系统发育以及不同科植物的比叶面积均表现为:生长盛期>生长末期。由此也体现了该区域不同功能(类)群植物对高度异质的喀斯特生境存在不同的适应策略。

Taking 68 representative plants in Maolan Karst areas as the study objects,a systematic analysis was made to clarify the life forms,phylogenies and specific leaf area of plants in different families.Some parameters were also measured,including the leaf area,leaf dry weight,and specific leaf area(SLA)of plants at the growth stages.The results showed that the leaf area,dry weight,and specific leaf area of 68 plant species were 4.28~223.63 cm^(2),0.015~1.381g,and 67.66~783.76 cm^(2)/g,respectively,particularly with the high coefficients of variation.The specific leaf area was negatively correlated with the leaf trunk weight(P<0.01),whereas,there was no significance with the leaf area(P>0.05).The SLAs of different life forms were ranked in the order of the herbaceous>shrubs>arbors,deciduous plants>evergreen plants at all growth stages.The highest SLAs of different life forms were achieved in the herbs,shrubs and arbors among the arbor,shrub,and climax community plots,respectively.Different phylogenies were represented as the ferns>seed plants at each growth stage.The family Selaginellaceae was the highest in the plants of different families.Furthermore,the specific leaf area of life forms,phylogenies and families were all shown as the peak growth>the end of growth stage.Adaptive strategies of plants were found in the functional groups response to the highly heterogeneous karst habitats.