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作 者 ：张晓可;王海军;茹辉军;赵伟华;

期 刊 ：武汉植物学研究 2010年 28卷 5期 页码：568-576

关键词：C4植物；C4/C3比；水库效应；黄河；

Keywords:C4plants, C4/C3ratio, Effectsofreservoirs, TheYellowRiver,

摘 要 ：于2008年9月16日至10月31日对黄河干流河岸带植物群落开展了系统调查。共采集高等植物124种,分属于32科、97属,其中C₄植物9科、24属、34种,占科、属、种总数的28%、25%和27%。对该区域的研究结果还表明:(1)C₄植物主要分布于单子叶植物纲的禾本科和莎草科,两者共占C₄植物总种数的61%。(2)从上游到下游C₄植物种数递增,但中游C₄/C₃比、C₄植物密度和生物量要明显高于上游和下游。(3)C₄植物种数及C₄/C₃比与海拔、年均气温、年均降水量及年均流量均有相关关系,C₄植物生物量仅和年均降水量显著相关。(4)水库位置的C₄/C₃比要明显高于其临近样区,说明C₄植物对水库干扰下河岸带植被的动态变化具有一定的指示作用。

Abstract:We conducted an investigation into the plant assemblage of the Yellow River’s mainstream between September 16th and October 31st,2008.The total of 34 C₄ plant species were recorded,belonging to 9 families and 24 genera,which corresponded to 27%,28% and 25% of the total species,families,and genera respectively.Further analyses indicated that:(1)Gramineae and Cyperaceae were the dominant taxa in the area,contributing 61% of the C₄ plants in species number.(2)The number of C₄ plant species increased from the upper to the lower reaches of the river,while the standing crops and the C₄/C₃ ratio in the middle reaches were higher than those in the upper and lower reaches.(3)The number of C₄ plant species and C₄/C₃ ratio were correlated with altitude,annual air temperature,precipitation,and discharge,while the biomass of C₄ plants only had a significant correlation with annual precipitation.(4)The C₄/C₃ ratio in the reservoir region was higher than that in adjacent regions,which suggests this ratio may be an indication of vegetation dynamics under the disturbance of reservoirs.

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