Effect of 3-year fencing on soil seed banks of three alpine grassland communities

Abstract

Abstract: In the Yellow River source region of the Qinghai-Tibet Plateau, we selected three different alpine grassland communities (shrub grassland, Kobresia pygmaea degraded grassland and black-soil) through three years of enclosure. Microscopic examination was used to research the size of soil seed banks, species composition, spatial distribution and correlation between vegetation and soil seed banks. The results showed that: 1) The density of soil seed banks within and outside the fence of K. pygmaea degraded grassland, black-soil and shrub grassland respectively were (9 938±1 780) and (15 330±1 827) seeds/m², (4 074±459) and (3 640±486) seeds/m², and (9 879±1 453) and (12 899±1 695) seeds/m², respectively but only the K. pygmaea degraded grassland within and outside the fence had significant differences. 2) The number of species in soil seed banks in the three alpine grassland communities within and outside the fence was not significantly different, but the proportion of grass and sedge seeds in the soil seed banks were greater within than outside the grassland fence which increased the proportion of native vegetation in the soil seed bank. 3) The Shannon-Wiener diversity index, Simpson diversity index and Pielou evenness index of the soil seed banks had the same pattern in each community and: black-soil>shrub grassland>K. pygmaea degraded grassland: K. pygmaea degraded grassland>black-soil>shrub grassland by the Margalef richness rules. The range of Sorensen similarity index between soil seed banks and vegetation in the three alpine grassland communities was 0.32-0.64 in the sequence and black-soil>K. pygmaea degraded grassland>shrub grassland, and within>outside. 4) Soil seed banks were mainly in the 0-5 cm soil layer with an average proportion of 88.56% of the total soil seed bank. While the overall differences within and outside the fence of the three grassland communities were not significant, the proportion of black-soil soil seed numbesr in the 5-10 cm layer was significantly greater than those of the shrub grassland and K. ygmaea degraded grassland. Thus grassland enclosure improved grassland soil seed bank status, had a greater significant effect for degraded grassland, and played an important role in grassland maintainance and recovery.

CLC Number:

S812.2

DENG Bin, REN Guo-hua, LIU Zhi-yun, SHANG Zhang-huan, PEI Shi-fang. Effect of 3-year fencing on soil seed banks of three alpine grassland communities[J]. Acta Prataculturae Sinica, 2012, 21(5): 23-31.

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