CAJ | 학술논문

植物的繁殖阶段对环境变化最为敏感，其生活史繁殖特性随地理和气候因子改变将发生适应性生态响应．研究调查了内蒙古锡林郭勒草原不同纬度带贝加尔针茅的生长和繁殖特性．结果表明：随纬度增大，种群的株丛密度显著降低（P＜0．001），丛围变大，单株生殖枝数显著增多（P ＝0．008）；随海拔升高，种群的株丛密度显著增大（P＝0．015），丛围变小，单株生殖枝数显著降低（P＝0．013），种子的芒针长随之缩短（P＜0．001）；随年平均降雨量增大，株丛密度、丛围大小和单株生殖枝数3个性状表现出与纬度相反的响应模式；种子长和生殖枝茎高两性状对各生态因子未表现出显著的变化响应．总体表明，随地理和气候环境变化，贝加尔针茅种群表现出不同的繁殖适应策略．
식물적번식계단대배경변화최위민감，기생활사번식특성수지리화기후인자개변장발생괄응성생태향응．연구조사료내몽고석림곽륵초원불동위도대패가이침모적생장화번식특성．결과표명：수위도증대，충군적주총밀도현저강저（P＜0．001），총위변대，단주생식지수현저증다（P ＝0．008）；수해발승고，충군적주총밀도현저증대（P＝0．015），총위변소，단주생식지수현저강저（P＝0．013），충자적망침장수지축단（P＜0．001）；수년평균강우량증대，주총밀도、총위대소화단주생식지수3개성상표현출여위도상반적향응모식；충자장화생식지경고량성상대각생태인자미표현출현저적변화향응．총체표명，수지리화기후배경변화，패가이침모충군표현출불동적번식괄응책략．
It has been believed that reproduction phase of plants is particularly vulnerable to environ-ment change,and thereby reproductive traits are highly prone to vary with ecological factors,reflecting plant's adaptation to specific habitats.Investigations into growth and reproduction of Stipa baicalensis were conducted in Xilinguole steppe of Inner Mongolia.The results showed that with latitude increasing,plant density significantly decreased (P <0.001),and basal diameter of tufted plant became smaller and the num-ber of reproductive shoots per plant notably reduced (P =0.008).In contrast to latitude,each of the three traits displayed opposite response to either elevated altitude or increased annual mean precipitation.In addi-tion,seed awn's length shortened with elevated altitude (P <0.001).For both seed length and stalk height of reproductive shoot,no significant response to ecological variables was observed.It is suggested that S. baicalensis employs different reproductive strategies in response to geographical and climatic variation.