Degradation and Rehabilitation of Natural Land

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Change of rangeland land use is one of the most important threats to rangeland ecosystems that this degradation and change can affect the components of ecosystems. The purpose of this study was to investigate the effect of land use change and compare plant composition and diversity in abandoned rangelands and drylands of three areas of Kilk, Salavat Abad and Sarab Qamish, Sanandaj. For this purpose, in each use, 3 transects with a length of 100 meters were randomly placed in the area and 10 plots of one square meter with a distance of 10 meters were selected on each transect, which a total of 180 plots were harvested. In each plot, the percentage of coverage related to any measurement was recorded and recorded. Indices related to richness, diversity and uniformity were calculated using PAST software. In order to statistically compare each of the parameters, one-way analysis of variance and Duncan's test were used in SPSS software. The results showed that out of 116 identified species, 61 species were common in the two uses and 37 species were found only in rangelands and 18 species were found only in converted lands. The palatable and perennial species Festuca ovina and Stachys inflata were the index of rangeland lands, and the annual and invasive species Heteranthelium piliferum and Taeniatherum crinitum were the index of abandoned drylands. The results showed that there was a significant difference between the indices of richness and diversity in the two uses, but this difference was not significant in the uniformity index. In general, the results showed that changing the use of pastures to agricultural lands has reduced the richness and diversity of species in these lands and agricultural activities on rangeland ecosystems can change the composition of species, the invasion of annual grasses and reduce valuable rangeland plants and forage in the wake of have.

Keywords: Degraded rangelands, Land use change, Species diversity, Vegetation composition, Sanandaj city

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