CAJ | 학술논문

植物的叶片与细根分别作为植物体地上和地下部分重要的营养器官,很多功能性状在二者之间存在着一定的关联性.研究这种关联有助于理解植物各性状之间的相互作用、植物生长过程中对资源的利用和分配,以及建立细根性状的估算模型.该研究对内蒙古锡林河流域65种植物叶片与细根的氮(N)含量、磷(P)含量、N:P以及比叶面积(SLA)和比根长(SRL)进行了比较研究,结果表明:在种间尺度上,叶片与细根间的N、P和N:P存在显著的相关性,而SLA与SRL之间相关性较弱;在种内尺度上,叶片和细根的N、P及SLA与SRL,在不同的物种中呈现出不同的趋势.此外,叶片与细根性状的关联,在不同的植物功能群之间存在差异.例如,双子叶植物叶片与细根间的N含量显著相关,P含量不相关;而单子叶植物二者之间的P含量显著相关,N含量无关联.该研究的主要结论是,在相对一致的生境中,植物叶片与细根性状的关联主要发生在不同物种之间,在种内尺度上这种天联不明显,这可能与植物功能性状在种内存在较小的变异幅度有关.
식물적협편여세근분별작위식물체지상화지하부분중요적영양기관,흔다공능성상재이자지간존재착일정적관련성.연구저충관련유조우리해식물각성상지간적상호작용、식물생장과정중대자원적이용화분배,이급건립세근성상적고산모형.해연구대내몽고석림하류역65충식물협편여세근적담(N)함량、린(P)함량、N:P이급비협면적(SLA)화비근장(SRL)진행료비교연구,결과표명:재충간척도상,협편여세근간적N、P화N:P존재현저적상관성,이SLA여SRL지간상관성교약;재충내척도상,협편화세근적N、P급SLA여SRL,재불동적물충중정현출불동적추세.차외,협편여세근성상적관련,재불동적식물공능군지간존재차이.례여,쌍자협식물협편여세근간적N함량현저상관,P함량불상관;이단자협식물이자지간적P함량현저상관,N함량무관련.해연구적주요결론시,재상대일치적생경중,식물협편여세근성상적관련주요발생재불동물충지간,재충내척도상저충천련불명현,저가능여식물공능성상재충내존재교소적변이폭도유관.
Aims Studies on the relationship between leaf and fine root traits provide insights into interactions among plant functional traits, plant strategy for resource acquisition and mass partitioning, and predictive models for fine root traits. Our main objectives were to test if leaf and fine root traits vary in a coordinated pattern in typical temperate grassland and to determine to what extent inter- and intra-specific leaf and fine root traits exhibit structural and functional convergence.Methods During July and August 2006, we measured nitrogen (N) and phosphorus (P) concentrations, N:P ratios of leaves and fine roots (diameter < 2 mm), specific leaf area and specific root length of 65 grassland species in Xilin River Basin, Inner Mongolia. We statistically analyzed correlations between leaf and fine root traits among and within species.Important findings At the inter-specific level, N concentrations, P concentrations and N:P ratios of leaves and fine roots were significantly correlated, while specific leaf area and specific root length showed a weak relationship. Species from different functional groups differ in the correlation pattern. In dicotyledons there was a strong correlation between leaf and fine root N concentrations, but not in P concentrations. In contrast, monocotyledons had a positive relationship between leaf and fine root P concentrations, but not N concentrations. Observed inter-specific correlations between above and belowground traits weakened or disappeared when examined at the intra-specific level. Thus, leaf and fine root traits were generally correlated among species, while correlations were weak within species.