CAJ | 학술논문

圆叶茅膏菜(Drosera rotundifolia)是营养贫乏型泥炭地的典型食虫植物.于2006年9月,应用"固有年际标记"确定长白山金川泥炭地边缘(A)和中心(B)圆叶茅膏菜种群的年龄结构,研究其生态可塑性.结果表明,两种群植株分别由5个龄级和4个龄级组成,年龄结构分别呈衰退型和稳定型.两个种群平均高度相差35.9%(n_A=80,n_B=110,P<0.01),泥炭地边缘的生境更有利于植株高度的生长.各龄植株的平均高度均随龄级增加而呈相似线性增长规律(n_A=80,n_B=110,P<0.05).泥炭地边缘植株平均叶长、叶宽、叶柄长均高于中心(n_A=74,n_B=104,P<0.01),而叶片表面的触毛密度则相反,泥炭地边缘植株的触毛密度显著低于中心(n_A=74,n_B=104,P<0.01).由于泥炭地边缘较中心生境土壤养分丰富,昆虫数量多,光竞争强烈,导致圆叶茅膏菜在植株高度、叶片形态、触毛密度方面表现出很高的生态可塑性,高生态可塑性应是圆叶茅膏菜种群适应泥炭地异质环境的重要手段.
원협모고채(Drosera rotundifolia)시영양빈핍형니탄지적전형식충식물.우2006년9월,응용"고유년제표기"학정장백산금천니탄지변연(A)화중심(B)원협모고채충군적년령결구,연구기생태가소성.결과표명,량충군식주분별유5개령급화4개령급조성,년령결구분별정쇠퇴형화은정형.량개충군평균고도상차35.9%(n_A=80,n_B=110,P<0.01),니탄지변연적생경경유리우식주고도적생장.각령식주적평균고도균수령급증가이정상사선성증장규률(n_A=80,n_B=110,P<0.05).니탄지변연식주평균협장、협관、협병장균고우중심(n_A=74,n_B=104,P<0.01),이협편표면적촉모밀도칙상반,니탄지변연식주적촉모밀도현저저우중심(n_A=74,n_B=104,P<0.01).유우니탄지변연교중심생경토양양분봉부,곤충수량다,광경쟁강렬,도치원협모고채재식주고도、협편형태、촉모밀도방면표현출흔고적생태가소성,고생태가소성응시원협모고채충군괄응니탄지이질배경적중요수단.
As a typical perennial carnivorous plant, Drosera rotundifolia added its poor nutrition by pursuing prey, and mainly distributed in oligotrophic peatlands. In Jinchuan Peatland(40°20′56″N,126°26′51″E)of the Changbai Mountains, Northeast China, age of shoots was identified with 'innate annual marker' method to determine age structure of Drosera rotundifolia populations both in the margin (A)and the center(B) of Jinchuan peatland in september,2006, to study the ecological plasticity of two D. rotundifolia populations .The results showed that the shoots were composed of 5 age classes and 4 age classes and showed declining and stable age structure for margin and center populations respectively, which resulted from the margin habitat was more vulnerable by artificial disturbance than the center habitat. The plants mean height in the center population was 35.9% shorterthan that of the margin population(n_A=80,n_B=110,P<0.01), because the habitat in the margin was more favorable to the height growth. Shoots mean height also increased with aging, and showed similar patterns of linear function(n_A=80,n_B=110,P<0.01). Mean leaf length, leaf width, petiole length per shoot in the margin was higher than those in the center(n_A=74,n_B=104,P<0.01). But tentacle density on the upper surface of the leaf per plant were in the opposite way(n_A=74,n_B=104,P<0.01). Compared with the center habitat, the margin habitat had richer nutrient, more insects, and stronger light competition. D.rotundifolia showed high ecological plasticity in shoot height,leave morphology and tentacle density, which resulted from difference in light, nutrient and insect resources availability in the two habitats. D.rotundifolia allocated limited energy to the growth of body size and tentacle reasonably. This resource allocation strategy and the high ecological plasticity were important ways for D.rotundifolia to adapt itself to the highly heterogeneous environment in peatlands.