بررسی تغییرات پوشش گیاهی تحت تاثیر بارندگی و رطوبت خاک

The present research was carried out in Golestan steppe pastures from 2007 for 4 years. The method of investigating vegetation variables was based on the use of three 500-meter transects and sampling on a 4-meter square plot, and a total of 30 plots were used. At the same time, soil moisture and soil organic carbon were also measured in each plot. Statistical analysis The collected data related to vegetation cover, moisture and soil organic carbon were compared using the SAS software and the average of each of the studied variables was compared using Duncan's method. The results showed that in a four-year period, proportional to Annual changes in rainfall and other climatic parameters and under local and local management conditions, more or less changes have occurred in the vegetation of the study site. In the Golestan site, perennial forbs and sedges along with annual species determine the vegetation changes. Organic carbon and soil moisture did not change much. In general, it can be said that, according to soil moisture and texture, the amount and distribution of precipitation and the physiological characteristics of different vegetation forms and of course taking into account the time of measurement. Vegetation and soil variables can be used to monitor changes in pasture ecosystems with the aim of correcting current management and achieving scientific pasture management.