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The establishment of pteridophytic vegetation in the disturbed sites of Guandaushi forest ecosystem
|關鍵字:||Guandaushi forest ecosystem;關刀溪森林生態系;pteridophyte;landslide;fire;蕨類植物;崩塌地;野火||出版社:||植物學系||摘要:||
The recent disturbances at Guandaushi forest ecosystem include earthquake-caused landslides and man-caused fire. The emergence and mortality of pteridophytic sporelings at disturbed sites, the composition and density of the soil spore bank, and the pteridophytic vegetation at undisturbed sites have been monitored in landslided and burned areas from March of 2001 to May of 2002. A total of 1,143 sporelings, belonging to 12 families, 21 species, 1 subspecies and 2 varieties, have been recorded in the studied plots. In soil spore bank, 25,552 sporelings in total, belonging to 15 families, 31 species and 2 varieties, were recorded during germination tests. The gametophytes emerged from the soil sample in four weeks, and sporelings appeared in six weeks. For the pteridophytic vegetation of undisturbed sites, 13 families, 22 species and
3 varieties were recorded.
The shade-intolerant species, Diplopterygium chinensis, Dicranopteris linearis var linearis, Sphenomeris chusan, and Blechnum orientale, were the pioneers at landslide. The density of sporelings were lower at landslide sites because of loss of top soil, but higher at sites that covered with herb. The stability and herb of topsoil will affect the establishment at landslides. After burning, buds of Brainea insignis which covered with dense scales, and buds of Pteridium aquilinum subsp. Wightianum which protected by soil pullulated rapidly. Drought affected spore germination and fertilization of pteridophytes, and soil water content might be the limiting factor during pteridophytic sexual reproduction at disturbed sites.
There were diverse species and abundant spores stored in soil spore bank. Part of the spores in the soil came from surrounding vegetation, and part of them from remote vegetation. Heat of fire and loss of top soil in landslides resulted in the lower density of spore bank in disturbed sites comparing to that of undisturbed sites. After burning, the percentage of Brainea insignis frond that product sorus was 87％ in first month at burned sites, and only 5％ at unburned sites. Spores could germinate at burned site, but mortality was high.
|Appears in Collections:||生命科學系所|
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