【作者】 王玉丽；

【导师】 肖洪兴；

【作者基本信息】 东北师范大学 ， 植物学， 2010， 硕士

【摘要】 本文对吉林省羊草草甸草原上的藻结皮进行了一系列研究。实验选择羊草群落、星星草群落、虎尾草群落、针蔺群落、寸草苔群落、碱斑六个群落中地表生长的藻结皮为研究对象,首先对藻结皮的成分进行鉴定,然后研究了藻结皮化感物对虎尾草种子萌发的影响;有藻结皮样地和去藻结皮样地土壤含水量、土壤温度、土壤含氮量的差别;藻结皮以及藻结皮中氮的降解;藻结皮的群体光合特性。结果表明:藻结皮主要是由亚气生蓝藻组成的。蓝藻化感物对虎尾草种子的萌发率没有显著影响,但对发芽的虎尾草种子的根长具有抑制作用,而对芽长的作用是低浓度促进高浓度抑制,且单因素方差分析结果表明对根和芽的作用均具有显著性。有藻结皮土壤的含水量和含氮量要比去藻结皮的土壤含水量和含氮量高,但是前者只有碱斑样地的方差分析结果具有显著性。有藻结皮的土壤温度要比去藻结皮的土壤温度低,除了碱斑样地跟针蔺群落样地外其他样地的数据方差分析的结果都具有显著性。藻结皮本身的降解和藻结皮中氮的降解受多种因素影响。最后实验还尝试了用自制叶室与LI-6400光合仪相连接测藻结皮的气体交换情况。更多还原

【Abstract】 In this paper , we studied the algae crusts which is growing in the Leymus chinensis grassland in Jilin Province. In this experiment, we selected six communities :Leymus chinensis,Puccinellia tenuiflora,Chloris virgata, Eleocharis congesta,Carex duriuscula, Alkali spot. First,we identified the species of the algae crusts,and then we studied the allelopathy of the algae crusts which has action on Chloris virgata,s germination percentage and the length of root and bud of Chloris virgata seeds. we also studied the difference of soil water content and soil temperature and nitrogen content between the sample plots with algae crusts and the sample plots without algae crusts. Last we measured the degradation of the algae crusts and the nitrogen content.We also studied the photosynthesis of algae crustsThe results showed that the algae crusts was composed of subaerial blue-green algae. The allelopathy of the algae crusts has no significant affect on Chloris virgata,s germination percentage ,but has significant affact on the length of root and bud of Chloris virgata seeds. Concerning the root ,there has allelopathic inhibition, while about the bud ,the allelopaty of algae crusts in low density can increase the lenth of bud ,and inhibit the length of bud in high density. Soil water content with algae crusts is wetter than that without algae crusts, but only the differences about Alkali spot sample plot were statistically significant. Nitrogen content of sample plots with crusts is higher than that without crusts.Soil temperature with algae crusts is lower than that without algae crusts,and the differences were statisticaly significant except for Alkali spot sample plots and Eleocharis congesta sample plots. The degradation of crusts and nitrogen in crusts is affected by many factors.At last we tried to use LI-6400 photosynthesis equipment and self-made room to measure gas exchange of crusts.更多还原