Effect of Tea Bushes on Soil Physics in the Forest areas Turned in low land Siahkal Forests

Conversion of forest land to other land uses is one of the most important human interference in natural ecosystems, which is effective on ecosystem processes, particularly soil. In order to study the effect of the tea bushes on soil physics in forest areas turned in low land Siahkal Forests, Series 3 Toshi in the Siahkal forests area in Gilan. Soil sampling is done by using systematic sampling method, and the depth of 0 to 30 cm. In total, 40 soil samples (20 samples for each region), to measure parameters of the soil were sampled and were transported to the laboratory. After normalization of the data, by using the Kolmogorov-Smirnov test, using the software SPSS 18, to study and compare data related to the parameters studied of soil in two areas of degraded forest and tea garden, Non-paired t-test was used. The results showed that, in both two areas of degraded forest and tea garden, soil type was clay loam, and the percentage of clay and sand in the forest is more than tea gardens and the percentage of silt in the forest is less than tea gardens. Apparent specific weight of soil in forest areas is more than tea garden areas and, conversely, the average actual specific weight, porosity in the tea gardens is more than the forest area, which represents an increase in soil quality due to conversion of forest land to the tea garden in the forest areas destroyed in downstream areas of forests in this region.