Soil seed banks of different grassland types of Alashan arid desert region, Inner Mongolia

Abstract

Abstract: Investigations on the soil seed banks of different grassland types of Alashan arid desert region in Inner Mongolia showed that when the altitudes of sampling plots increased from 1370 m to 1750 m, the soil seed densities of natural grasslands decreased from 326 grain·m^-2 to 76 grain·m^-2.At the altitude of 1100 m, the soil seed density was 56 grain·m^-2 in typical desert plot, but only 8 grain·m^-2 in the sand dune plot.After the vegetation was restored with Artemisa sphaerocephala on sand dune, its soil seed density increased obviously, almost as 17～29 times as sand dune's.In this study, 31 seeds m^-2 were sampled, which belonged to 11 families.Among them, annual plants accounted for 77%, 100% and 70%, perennial plants accounted for 21%, 0 and 16%, and semi-shrubs accounted for 2%, 0 and 14%, respectively for natural grassland, sand dune and sown grassland.Shrub seeds were not found in all the soil seed bank plots.When the altitudes of sampling plots increased from 1100 m to 1750 m, the species richness (Margalet index) of soil seed banks of natural grasslands increased from 1.49 to 2.77, and the species diversity (Shannon-Winner index) increased from 0.697 to 0.917.

Key words: Seed bank, Arid desert, Life form, Species diversity, Similarity

CLC Number:

ZENG Yanjun, WANG Yanrong, NAN Zhibiao, WEI Dong, CHEN Shanke, LI Baoer . Soil seed banks of different grassland types of Alashan arid desert region, Inner Mongolia[J]. Chinese Journal of Applied Ecology, 2003, (9): 1457-1463.

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