围封对荒漠草原区沙芦草群落土壤种子库及地上植被的影响

doi:10.11686/cyxb2017101

摘要/Abstract

摘要： 以宁夏盐池县四墩子荒漠草原沙芦草群落为研究对象,通过室内种子萌发法和地上植被调查法研究了围封对沙芦草群落土壤种子库和地上植被的影响。结果表明:1)围封对沙芦草群落土壤种子库密度具有显著影响,围栏外土壤种子库密度为(1052±273) 粒·m^-2,围栏内种子库密度为(1885±100) 粒·m^-2 ,围封使土壤种子库密度增加了79.0%。围封后,一年生植物种数减少了8.2%,种子库密度却增加了44.0%;2)围栏外地上物种数28种,围栏内为32种,围封使地上植被植物种数增加了14.0%。其中多年生植物增加,一年生植物减少;3)围封后,沙芦草群落土壤种子库和地上植被的Margalef丰富度指数、Shannon-Wiener指数、Pielou均匀度指数、Simpson优势度指数均有增大趋势,但差异不显著,而其生活型功能群的多样性发生了不同程度的改变;4)围栏内外土壤种子库与其地上植被的Sorensen相似性系数均为中等不相似,封育样地(0.33)略低于未封育样地(0.35)。种子库之间相似性高达0.71,两个样地地上植被之间的相似性为0.62,二者均为中等相似,说明外界干扰对地上植被的影响要大于对种子库的影响。研究结果可为荒漠草原区植被的恢复与治理提供一定的参考。

Abstract: Impacts of fencing on the soil seed bank (SSB) and the aboveground vegetation characteristics of an Agropyron mongolicum community in Yanchi County, Ningxia, were studied by germination, and vegetation survey techniques, respectively. The results showed that: 1) Herbivore exclosure significantly increased the SSB density. The total count of seeds in the SSB outside the enclosures was (1052±273) viable seeds·m^-2, but was (1885±100) viable seeds·m^-2 inside the enclosures. After herbivore exclosure, the number of annual species decreased by 8.2%, while seed density increased by 44.0%. 2) At sampling, there were 28 plant species (8 annuals+20 perennial species) present inside the enclosure and 32 species (7 annuals+25 perennial species) present outside the enclosure. 3) After enclosure, values for the Margalef richness index, Shannon-Wiener index, Pielou evenness index and Simpson dominance index of the SSB and the aboveground vegetation showed increasing trends, but the difference was not significant. However, the diversity of life form functional groups changed to some degree. 4) The similarity between seed banks of fenced and unfenced areas was 0.71, whereas the similarity between fenced and unfenced aboveground vegetation characteristics was 0.62, indicating that the impact of external disturbance on vegetation was greater than the impact on the seed bank. This study provides reference information useful for the restoration and management of vegetation in desert steppe areas.

赵盼盼, 李国旗, 邵文山, 靳长青. 围封对荒漠草原区沙芦草群落土壤种子库及地上植被的影响[J]. 草业学报, 2018, 27(1): 42-52.

ZHAO Pan-pan, LI Guo-qi, SHAO Wen-shan, JIN Chang-qing. Influence of herbivore exclusion on the soil seed bank and the aboveground vegetation characteristics of Agropyron mongolicum dominant desert steppe grassland[J]. Acta Prataculturae Sinica, 2018, 27(1): 42-52.

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