高寒退化与未退化草甸土壤下匍匐茎鹅绒萎陵菜的克隆生长特征的比较

通过鹅绒萎陵菜的野外移栽试验，分析了在矮嵩草草甸土壤和退化草甸土壤下该种植物的克隆繁殖特征．结果表明，在母株产生的匍匈茎数量、母株高度和叶片大小在两类不同土壤下没有明显差异．母株叶片数、匍匈茎的粗度、匍匈茎长度以及间隔子的长度有较明显的差异．在退化草甸土壤中母株叶片较多，匍匈茎长度和间隔子长度明显较长，匍匈茎直径也明显较大．在退化草甸环境中，由于土壤养分相对较缺乏，鹅绒萎陵菜可能通过增加母株叶片的数量，尽可能多地积累光合产物，来保证匍匈茎的生长，匍匈茎也以增加粗度和增加长度来尽量增强其觅食能力．鹅绒萎陵菜在生物量投资分配上也表现出一定的差异．与退化草甸土壤环境相比，在未退化草甸土壤中，鹅绒委陵菜克隆母株和分株的生物量均明显偏向地下部分(根系)的投资，以期从土壤中吸收更多的养分，从而最终提高子株的成活率．

Clonal growth of stoloniferous herb Potentilla anserina on degraded and non-degraded alpine meadow soil

The clonal growth of Potentilla anserina on degraded and non degraded Kobresia humilis meadow soil was studied by a transplanting experiment in the field. No significant differences in numbers of stolons, height, and leave size per mother ramet were observed between the two soils , but the numbers of leaves per mother ramet, length and width of stolon,and spacer length were significantly different. There were more leaves per mother ramet, longer stolon and spacer, and wider stolon on degraded soil, where available nutrient was poor than in non degraded soil. Under degraded alpine meadow soil condition, the clonal plant species might produce much more photosynthetic product to support stolon growth by the increase of leave numbers per mother ramet,and the longer and wider stolon could intensify the foraging ability of the mother ramet that would benefit to daughter ramet. Both mother and daughter ramet of Potentilla anserina invested much more biomass to their underground part (root system) in non degraded soil to increase the survival rate of daughter ramet.