Soil Erodibility And Its Relative Factors Of Different Soil Types In Subtropical China

There are a lot of soil degradation types in the south of China, but the most important and serious type which has the widest distribution is the soil erosion resulted from poor use of the soil. The speed of soil erosion can be determined by the amount of soil erosion which depends on the anti-erosion and anti- rushing force, namely is interior forces, except for outside forces such as the erosion media. Internationally, it's determined with soil erosibility and presented by K value which is the base of soil erosion factors. No matter of the ULSE(Universal Soil Loss Equation) used widely in the whole world and the WEPP(Water Erosion Prediction Project) model started to be researched in the middle of the 1980's, they all take the K value as an important factor and major research content of soil erosion for further research.To better understand the soil erosion resistance of the different soil in south China so as to provide the necessary basic data for the forecast of regional soil erosion, planning of soil using, assessment of soil using and the potential fatalness of soil environment. This paper took rainfall of Yingtan of Jiangxi Province as an example and accords to the observed materials of rainfalls and some data recorded soil erosion of main soil types in the Ecological Experiment Station of Red Soil (EESRS) located in Yingtan, Jiangxi Province from 1997 to 2003, the relationship between the amounts of soil erosion and some rainfall factors under different subtropical soil was explored. The result showed that the rainfall of the area were 1830mm , 2414mm, 1274mm, 1732mm, 1653mm, 1711mm and 1327mm respectively, comparing to the average rainfall, 1752 mm, except for the abnormal climate in 1998 and the rainfall boomed, the other years basically belong to dry years. According to EI₃₀ of index R, the rainfall erosivity of all years were 424.9, 708.1 , 218.7, 403.3, 265.7, 370.7 and 327.9 (100ft.sht.in/ac.hr.y )respectively, the rainfall erosivity had larger difference between years and the extremely unbalanced character between months which was the same with law of the rainfall E value, month cumulate I₃₀. From the soil loss distribution of erosibility plots, Ali-Udic Luvisols developed from granite (plot 15), Udic Ferrisols developed from mica rock (plot17),...