Document Type : Research
Authors
1
Department of Natural Resources Fars Agriculture and Natural Resources and Education Center
2
1Associate Prof. of Soil Science, Soil conservation and watershed management research department, Agriculture and Natural Resources Research and Education Center of Fars Province, Research, Education and Extension Organization, Shiraz, Iran
3
Department of Natural Resources, Fars Agricultural and Natural Resources Research and Education Center
10.22092/wmrj.2023.361934.1535
Abstract
Introduction and Objectives: The presence of many species in the seed bank can explain the effect of environmental and management factors in the past. Identification of this species resource plays an important role in the protection and restoration of vegetation. The aim of the research is to investigate the biodiversity indices of the existing seed bank as a result of flood spreading in order to restore and improve the vegetation cover in degraded rangelands.
Materials and Methods: In order to investigate the effects of flood spreading on the composition, density, diversity, richness and evenness species of the soil seed bank in two areas with flood spread and without flood spread (Control) in Gareh Bygane Fasa region, it was carried out for three years from 2020. Past software was used to determine diversity, richness and evenness of species. For species richness of the soil seed bank, Margalef and Menhinic indices were used, Shannon-Wiener and Simpson indices were used for diversity, and Hill index was used for evenness. To compare the properties of the soil seed bank (density, richness, diversity and evenness) was also used between two representative areas of flooded rangeland and non-flooded rangeland (control) and also to compare the characteristics of the soil seed bank at two depths of 0-5 and 5-10 cm t-test. For Statistical analyzes were performed by R software using one-way analysis of variance and comparison of means using Duncan's method.
Results and Discussions: The results of the greenhouse studies showed that a total of 5340 seeds germinated in the greenhouse, 3756 seeds germinated in the flood spreading area at a depth of 0-5 cm and 1190 seeds germinated at a depth of 5-10 cm. The results of variance analysis showed that in terms of biodiversity indices (density, number of species, diversity, and richness species evenness) between the strips of Bisheh Zard 1 and Control flood spreading network at the depth of 0-5 and 5-10 cm of the bank there is a significant difference between soil seeds at the level of 1% and 5%. The results of the t-test showed that in terms of biodiversity indices between the depths of 0-5 and 5-10 cm of the soil seed bank both in the flood spreading area and in the non-flooding area (control) there is a significant difference in There are 1% and 5% levels.
Conclusion and Recommendations: In general, the results of this research showed that the soil seed bank of this region had a positive response to the implementation of the flood spreading operation, so that the highest density, diversity, richness and evenness of the soil seed stock was observed in the flood spreading area.
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