Seed germination traits of two plant functional groups in the saline deltaic ecosystems  

作　　者：Xiao-dong Zhang Wen-ting Xu Bo Yang Ming Nie Bo Li 

机构地区：[1]Coastal Ecosystems Research Station of the Yangtze River Estuary,Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering,Institute of Biodiversity Science,Fudan University,220 Handan Road,Shanghai 200433,People’s Republic of China

出　　处：《Journal of Plant Ecology》2011年第3期169-177,共9页植物生态学报（英文版）

基　　金：National Basic Research Program of China(2006CB403305);and a Research Award for Outstanding Doctoral Students of Fudan University to Xiao-dong Zhang.

摘　　要：Aims Salt stress resulting from soil salinization is one of the driving forces of the land degradation throughout the world.The modern Yellow River delta is one of the most saline areas in China.Phytoremediation can be an effective way to restore the salinized ecosystems,which requires selecting appropriate plant species.This study explored the germination responses of common plant species from contrasting habitats in the Yellow River delta to varying salinity,offering experimental information for ecosystem restoration in the Yellow River delta.Methods In this study,15 common plant species from the Yellow River delta were divided into two groups(high-salinity and low-salinity groups)by their natural habitats using Canonical Correlation Analysis.Seeds of each species were treated with five salinity levels(0,5,10,20 and 30 ppt),using a randomized complete block design,and germinated seeds were counted and removed daily for 28 days to calculate the final germination proportion and mean time to germination.The germination responses of seeds to salinity treatments were compared between the two groups.Important Findings In relation to salinity,seed germination behavior of the test species was closely related to the salinity level of the habitats over which they were distributed.Species from the habitats with higher salinity had generally higher final germination proportion but shorter mean time to germination than those from the habitats with lower salinity in all of five salinity treatments used.The final germination proportion and mean time to germination of low-salinity group species were more sensitive to salinity than those of high-salinity group species.Selecting the species with high final germination proportion and short mean time to germination is important for restoration of salinized land.

关 键 词：deltaic ecosystems functional groups germination traits restoration salinity 

分 类 号：Q94[生物学—植物学]