若尔盖高原湿地木里苔草生理生态特征对水深梯度的响应

Responses of Carex Muliensis growth characteristics to water level gradient in Zoige Plateau wetland

木里苔草作为一种典型的高原湿地植被景观,其生理生态特征受到水深梯度变化的显著影响。选取若尔盖高原沼泽湿地典型植物木里苔草(Carex muliensis)作为研究对象,通过模拟实验,研究了其在-5cm、-3.5cm、0cm、8cm和22cm水深梯度下株高、叶长和叶宽的生长特征及增长量的变化规律,以及叶绿素、叶氮和生物量的变化趋势。结果表明:木里苔草在水深为8cm时呈现最大的株高、叶长和叶宽,其中以株高对水深梯度的响应最为显著,叶宽对水深梯度的响应并不明显,适度干旱或淹水都对木里苔草生长起到促进作用。此外,叶绿素、叶氮含量和生物量也都在8cm水位下达到最大。通过此实验,可以阐明木里苔草生长对水深条件的响应,为若尔盖湿地保护和恢复提供数据支撑与实践依据。

This paper investigated the growth characteristics including plant height,leaf length,leaf width,and their incremental pattern of Carex Muliensis,a typical grass in Zoige Plateau wetland under water level gradient of-5.0cm,-3.5cm,0.0cm,8.0cm,and 22.0cm.The results showed that the maximum plant height,leaf length,and leaf width of Carex Muliensis were found in the water depth of 8.0cm.The response of plant height to water depth gradient was the most significant,while the response of leaf width to water depth gradient was not obvious.The moderate drought or flooding can promote the growth of Carex Muliensis.In addition,chlorophyll,leaf nitrogen content,and biomass also reached the maximum under 8.0cm water level.Through this experiment,the response of the growth of Carex Muliensis to water depth conditions can be elucidated,which provides data support and practical basis for the protection and restoration of Zoige Wetland.