Response to increasing precipitation in Artemisia desert grassland of soil seed bank composition and species diversity of germinating plants

doi:10.11686/cyxb2019288

Abstract

Abstract: In this study, plots of six different precipitation regimes [natural conditions, CK; and artificially simulated precipitation increases of 5% (W₅), 10% (W₁₀), 15% (W₁₅), 20% (W₂₀) and 25% (W₂₅)] were established in moderately degraded Seriphidium transiliense desert grassland in order to study the effects of increasing precipitation on the seed density in the soil seed bank and on numbers of plant species represented. It was found that the number of species with germinated seedlings, and the seed numbers in the soil seed bank in the 0-5 cm soil layer increased gradually with increasing precipitation, with the germinated-seedling density of W₂₀ and W₂₅ being significantly (P<0.05) higher than other treatments, and the number of species with germinated seeds increased by 2.6 times and 2.0 times respectively as compared with the CK treatment (7 species). The same pattern was also seen in the seed bank of the 5-10 cm soil layer. For all six precipitation regimes, S. transiliense, Kochia prostrata and Gagea albertii all germinated in soil from the 0-10 cm soil layer, and precipitation increase significantly promoted the seed numbers germinated of S. transiliense, K. prostrata, Geranium transversale and Geranium albertii. With increasing precipitation, the Sorensen similarity between species germinating from the soil seed bank in the 0-5 cm soil layer and aboveground vegetation increased first and then decreased in S. transiliense desert grassland, and the Sorensen similarity of species composition of aboveground vegetation under W₂₀ and W₂₅ treatment was higher than other treatments. The Shannon-Wiener index, Pielou index and Patrick index of the number of species represented in the seedbank in S. transiliense desert grassland showed an increasing trend after precipitation enhancement, and the increase in the 0-5 cm soil layer was more obvious than that in the 5-10 cm soil layer. The germinated seed density in soil seed bank had obvious spatial heterogeneity, and was affected by the interaction of spatial sampling locations and precipitation. In summary, precipitation enhancement increased the number of germinating plant species, the density of seeds germinating, and the plant diversity index in the soil seed bank of the S. transiliense desert grassland studied. This in turn increased the similarity in species composition between the aboveground vegetation and the seedbank and was beneficial to the restoration of degraded sagebrush desert grassland.

Key words: increasing precipitation, Artemisia desert grassland, soil seed bank, plant diversity, community similarity

TIAN Meng, SUN Zong-jiu, LI Ying, LI Pei-ying, XIE Kai-yun. Response to increasing precipitation in Artemisia desert grassland of soil seed bank composition and species diversity of germinating plants[J]. Acta Prataculturae Sinica, 2019, 28(12): 17-28.

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