湖泊科学2024，Vol.36Issue(5)：1470-1478,中插15,10.DOI:10.18307/2024.0533
洞庭湖湿地短尖薹草(Carex brevicuspis)种群克隆生长对泥沙淤积的适应
Clonal growth adaptation of Carex brevicuspis to sediment deposition in Lake Dongting wetland
摘要
Abstract
Sediment deposition is an important factor affecting the survival and growth of wetland plants.Clonal plants are one of the most important plants in the wetland ecosystem.At present,there are few studies on the response of clonal plant populations to different deposition rates in wetlands under natural hydrological conditions.In this study,Carex brevicuspis,a typical clonal plant in Lake Dongting wetland,was chosen to investigate its population response to different deposition rates(0,2,4,6 cm/a,corre-sponding to control,low,medium,and high deposition rates,respectively)by field control experiments for three consecutive years.Results showed that sedimentation rate had a significant effect on the plant population density,with significantly lower popu-lation density in the sedimentation treatment.Plant population density decreased and the ratio of underground/aboveground biomass increased with sedimentation rate increase.With the treatment of the highest sedimentation rate,the plant population has lowest density and the highest ratio of underground/aboveground biomass.Sediment burial promoted the formation of more short roots(＜10 cm),long rhizomes(≥ 1 cm),and spreading ramets.The length of long rhizomes increased with the deposition rate.The number of long rhizomes was lower and the length of long rhizomes was longer in high sedimentation rate than other treatments,which indicated that the clonal growth strategy of C.brevicuspis population changed from phalanx type to guerrilla type.Therefore,at the population level,plants can effectively deal with the influence of different sediment deposition rates by regulating their popu-lation density,biomass allocation,root length,and clonal growth strategies.关键词
淤积速率/湿地植物/种群特征/根系/克隆生长Key words
Sedimentation rate/wetland plant/population characteristics/root system/clonal growth引用本文复制引用
潘柏含,黎慧娟,邹雅,邓正苗,谢永宏,侯志勇,李旭,曾静,吴滔,谢洪涛..洞庭湖湿地短尖薹草(Carex brevicuspis)种群克隆生长对泥沙淤积的适应[J].湖泊科学,2024,36(5):1470-1478,中插15,10.基金项目
国家自然科学基金区域创新联合基金项目(U21A2009)、国家基础性工作调查专项(2019FY100602)和湖南省教育厅科学研究项目(19B378)联合资助. （U21A2009）
