CAJ | 학술논문

理解植物各器官间功能性状的关联,有助于确定控制功能性状的内在机制以及性状间的比例关系.基于内蒙古温带草地19个地点、42种优势草本植物的野外观测,分析了叶片、茎、牛殖器官、细根和粗根问功能性状(N、P含量、N:P、比叶面积、比根长以及叶片和细根的组织密度)的关联.主要结果如下:在种群和物种水平上,各器官的N和P含量都显著正相关,比叶而积与叶片N、P含量和组织密度在种群水平上显著负相关,而在物种水平上没有显著的相关关系;而比根长仪在种群水平上与细根的组织密度显著负相关.N、P含量以及N:P在各器官之间一致呈显著正相关,而比叶面积和比根长没有显著的相关关系.叶片和细根的组织密度在种群水甲上显著负相关,而在物种水平上没有显著的相关关系.非禾草比禾草相应器官(除茎外)的N、P含量高,但二者茎的N、P含量没有显著的差异;豆科植物比非豆科植物相应器官的N含量高,而P含量没有显著的差异.
리해식물각기관간공능성상적관련,유조우학정공제공능성상적내재궤제이급성상간적비례관계.기우내몽고온대초지19개지점、42충우세초본식물적야외관측,분석료협편、경、우식기관、세근화조근문공능성상(N、P함량、N:P、비협면적、비근장이급협편화세근적조직밀도)적관련.주요결과여하:재충군화물충수평상,각기관적N화P함량도현저정상관,비협이적여협편N、P함량화조직밀도재충군수평상현저부상관,이재물충수평상몰유현저적상관관계;이비근장의재충군수평상여세근적조직밀도현저부상관.N、P함량이급N:P재각기관지간일치정현저정상관,이비협면적화비근장몰유현저적상관관계.협편화세근적조직밀도재충군수갑상현저부상관,이재물충수평상몰유현저적상관관계.비화초비화초상응기관(제경외)적N、P함량고,단이자경적N、P함량몰유현저적차이;두과식물비비두과식물상응기관적N함량고,이P함량몰유현저적차이.
Aims The temperate grasslands in Inner Mongolia, representing a great diversity in vegetation types (desert steppe, typical steppe and meadow steppe) and function groups (grass/herb, legume/non-legume), are ideal places to test the hypothesized functional trait relationships among plant organs. Our main objective in this study was to test whether plant functional traits vary in a coordinated fashion both within and across organs. Methods Based on the field observation during July and August in both 2006 and 2007, we measured suites of ecophysiological traits of 42 grassland species from 19 sites in Inner Mongolia. The longitude of the study region ranges from 112.82° to 120.12° (E), and the latitude ranges from 41.76° to 49.89° (N). N and P concentrations, N:P ratios of leaves, stems, reproductive structures, fine roots (diameter ＜ 1 mm) and coarse roots (diameter ＞ 1 mm) as well as tissue density of leaf and fine root and specific leaf area/specific root length were determined. Important findings At both population and interspecific level, N and P concentrations were positively correlated within each organ. Specific leaf area was negatively correlated with leaf N and P concentrations and tissue density at the population level but not at the interspecific level. Specific root length was negatively related to fine root tissue density at population level. Plants with low leaf or fine root tissue density had leaves or fine roots with high N concentrations and large specific leaf area or specific root length. N and P concentrations as well as N: P ratios were also consistently correlated across all organs, but no correlation between specific leaf area and specific root length was observed. At the population level there existed a weak negative correlation between leaf and fine root tissue density while at interspecific level this relationship disappeared. Grasses had lower N and P concentrations than herbs in leaves, reproductive structures and roots, but not in stems. Legumes had higher N concentrations than non-legumes in all organs, but they showed no significant differences in P concentrations.