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不同水位梯度下克隆植物大米草的生长繁殖特性和生物量分配格局
引用本文:李红丽,智颖飙,雷光春,赵磊,安树青,邓自发,周长芳,徐贵明.不同水位梯度下克隆植物大米草的生长繁殖特性和生物量分配格局[J].生态学报,2009,29(7):3525-3531.
作者姓名:李红丽  智颖飙  雷光春  赵磊  安树青  邓自发  周长芳  徐贵明
作者单位:1. 北京林业大学自然保护区学院,湿地教研室,北京,100083;南京大学生命科学学院,湿地生态研究所,南京,210093
2. 南京大学生命科学学院,湿地生态研究所,南京,210093
3. 北京林业大学自然保护区学院,湿地教研室,北京,100083
基金项目:国家林业公益性行业科研专项资助项目,国家林业部引进国际先进农业科学技术计划(948计划) 
摘    要:通过温室模拟控制实验,研究了不同水位梯度处理对外来克隆植物大米草(Spartina anglica) 衰退种群的形态性状、克隆生长性状、生物量积累及生物量分配格局的影响.实验共设置5种水位处理,分别为淹没至大米草株高的1/2, 淹没至株高的1/3,表面水淹0 cm,低于土表5 cm (-5 cm),以及低于土表10 cm (-10 cm).结果表明:水位梯度对大米草的形态性状、克隆生长性状、生物量的积累与分配格局等部分指标均有显著影响(p < 0.05);株高、克隆分株数、根状茎节数、根状茎总长、间隔子长度及生物量在0 cm至1/3株高水位梯度处理下均显著高于-10 cm和1/2株高水位处理(p < 0.05),但与-5 cm处理无显著差异(p > 0.05);-10 cm水位处理的地上生物量分配和根状茎生物量分配显著低于其它处理(p < 0.05).综合大米草衰退种群的形态特征、克隆生长特性、生物量积累及分配格局对水位处理的响应格局,认为大米草种群较适宜的水位梯度为表面积水至淹没株高的1/3处,而水位的变化可能是大米草种群自然衰退的原因之一.

关 键 词:大米草  水位梯度  可塑性  自然衰退  生态响应策略
收稿时间:2008/11/30 0:00:00
修稿时间:2009/1/14 0:00:00

Plant growth, reproduction characters and biomass allocation in response to water level gradient in the clonal plant Spartina anglica
Li Hongli,An Shuqing,and.Plant growth, reproduction characters and biomass allocation in response to water level gradient in the clonal plant Spartina anglica[J].Acta Ecologica Sinica,2009,29(7):3525-3531.
Authors:Li Hongli  An Shuqing  and
Affiliation:Nanjing University,,,,Nanjing University,,,
Abstract:Results of a greenhouse experiment showed that water level gradient had significant effects on morphological traits, clonal characteristics, biomass accumulation and biomass allocation patterns of Spartina anglica. The effects of water level gradient on the morphological traits and biomass allocation of S. anglica were studied in the glasshouse with populations coming from the Xinyang Harbor in Jiangsu Province, China. Five treatments were set up with water levels from submergence to 1/2 of the plant height, 1/3 of plant height, and water level at substrate level, -5 cm and -10 cm below the substrate surface. With the submergence of 1/3 of plant height and water at substrate level treatments, plant height, number of ramets, number of rhizome nodes, total rhizome length, spacer length and biomass production were significantly higher than those of -10 cm and 1/2 plant height treatments (p < 0.05); and these parameters with -5 cm treatment were not significantly different from those of the submergence of 1/3 of plant height or water at substrate level treatments (p > 0.05). With the -10 cm treatment, biomass allocations to above\|ground and rhizomes were significantly lower than other treatments. The results indicate that S. anglica populations grow better with water submergence from substrate surface to 1/3 of plant height. The results also indicate that change in hypsography and subsequently degree of inundation for S. anglica may explain the decline of its populations over its range.
Keywords:Spartina anglica  morphological plasticity  water level gradient  ecological strategy
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