不同石漠化等级的孢粉组合特征及其生态指示意义——以花江实验区为例

Aalynological assemblage characters and the ecologic significance among rocky desert of different grades——A case in Huajiang

以贵州省关岭县南部北盘江试验示范为例,分析了不同等级石漠化土地上的表土孢粉组合特征,揭示了孢粉组合特征与石漠化等级的相互关系。结果显示:石漠化地区的孢粉组合具有鲜明的特征,乔木与灌木合占16.1%,草本与蕨类植物合占58.9%,这反映了石漠化地区以草蕨类植物为主的植被状况;孢粉组合与石漠化等级呈良好的相关性,草蕨类植物随石漠化等级的升高比重由41%增加到77.6%,种类由14种增加到27种,乔木花粉所占比重由6.9%降到2.6%,植物种类不变;孢粉组合反映出三出凤尾蕨等蕨类植物对岩溶石漠化生态环境的适应性和代表性。

Taken the demonstration plot in the Beipangjiang basin to the south Guangling County,Guizhou Province as an example,the authors analysis palynological assemblage characters from surface soil among rocky desert of different grades,reveal the rclations between palynologyical assemblage characters and rocky desertification grades.The results show that the palynological assemblage characters is of distinct individuality in rock desert with 16.1% of arbor and shrub and 58.9% of herb and fern,which reflects herb and fern are the dominat plants in the vegetation of rock desert.The results also show that the palynological assemblage quite correlates to the grades of rocky desert,i.e.the content of herb and fern goes up from 41% to 77.6% with the species from 14 up to 27,but the content of arbor goes down from 6.9% to 2.6% without species changes along with the increases of the grades of rocky desert.The palynological assemblage characters reflect that ferns like Pteris trifurcata Ching can adapt the desert environment and has representativeness in these regions.