在退化草地植被的恢复和演替中，土壤种子库在起着重要作用，为搞清楚张家川县退化草地土壤种子库特征，调查了从轻度、中度到重度三种不同退化草地土壤种子库特征，分析了三种不同退化程度草地土壤种子库的垂直分布动态，以期为张川县退化草地生态恢复提供理论依据。结果表明：1) 三种不同退化草地依次鉴定出12、9和4种植物，禾本科为优势科；2) 三种退化草地种子随土层深度的增加而减少；每层种子数量差异明显(P < 0.05)，种子库密度与地上植被的生物量、土壤含水量、土壤总氮含量、总钾、土壤速效磷含量均呈显著负相关(P < 0.05)，但与其它土壤因素之间土相关性不显著(P > 0.05)。地上植被生物量与土壤全磷呈极显著负相关(P < 0.05)。
Soil seed bank plays an important role in the restoration and succession of vegetation in degraded ecosystems. In order to identify the characteristics of soil seed bank of degraded grassland in Zhangchuan County, soil seed bank in three different degraded grasslands, lightly degraded, moderately degraded, heavily degraded were studied and its’ vertical distribution dynamics analyzed. 1) Based on the results, 12, 9 and 4 plants species were identified in moderately degraded, heavily degraded successively, and Gramineae were the most dominant families. 2) Soil seed bank was mainly stored in the 0 - 2.5 cm soil layer in three different degraded grasslands, there was significant difference of seed reserve in each layer (P < 0.05); soil seed bank density of degraded grassland was negatively correlated with the biomass, soil W, soil V, soil N, soil K and Soil RP (P < 0.05), and there was no significant correlation between the density of soil seed bank and other factors (P > 0.05). The biomass was negatively correlation with soil P (P < 0.05).
References
[1]
Keeley, J.E. (1977) Seed Production, Seed Populations in Soil, and Seedling Production after Fire for Two Congeneric Pairs of Sprouting and Nonsprouting Chaparal Shrubs. Ecology, 58, 820-829. https://doi.org/10.2307/1936217
[2]
Roberts, H.A. (1981) Seed Banks in the Soil. Advance in Applied Biology, 6, 1-55.
