黑河流域中游水陆交错带湿地土壤盐度对芦苇种群生长发育影响研究

摘要

通过对黑河流域中游水陆交错带湿地土壤盐度对芦苇(Phragmites australis )种群生长发育影响进行的调查，研究了该区湿地土壤盐度与芦苇生长的相关性，结果表明：随着盐度的增加，芦苇的地上生物量呈缓慢下降趋势；盐度对芦苇的植株密度和植株高度也有较大的影响，在土壤中盐度低于15‰时，芦苇能够存活生长，当土壤中盐度高于15‰时，将出现负增长；芦苇的幼苗期与成熟期相比有很大的不同，幼苗期的叶片在任何盐度下都有很高的死亡率，盐度对生长期叶子的数量影响非常明显。%Effects of soil salinity of wetland in land-lake ecotone in middle reaches of Heihe River Basin on growth of Phragmitesaustralis population were investigated.Relationship between soil salinity and growth of Phragmitesau-stralis were discussed.Result indicates that with the increase of salinity,the ground biomass of Phragmitesaustra-lis shows a trend of slow decline;salinity has a great influence on density & height of Phragmitesaustralis.When soil salinity is below 15 ‰,the Phragmitesaustralis can survive,but when the soil salinity is higher than 15 ‰,its growth will be negative growth.The seedling period of Phragmitesaustralis is very different from mature period of Phragmites Australis;the leaves in the seedling period have a high mortality rate under any of the salinity.Salinity has very obvious effect on the number of leaves in the growth period.