Spatial Variability Characteristics of Slope Soil Nutrients in Small Watershed of The Middle of Shandong Province

In this study,we took three natural slopes(Sunny slope,East slope and West slope) in a small watershed of Shandong Province to explore the spatial variability characteristics of soil nutrients.The results showed that organic matter content was in a trend of East slope West slope Sunny slope when the distance was less than 20 m along the slope direction but in a trend of West slope Sunny slope East slope when the distance was more than 30 m.Along the slope direction,soil organic matter and available N,P and K contents of the three slopes were different,and were in a general trend of lower in the upper and higher in the bottom of the slopes.Soil organic matter and available N,P and K contents of East slope and West slope decreased as the depth increased.The average content of organic matter was about 8 g/kg at 0-20 cm and about 2 g/kg at 80-100 cm and available N content was 50 mg/kg at 0-20 cm and 20 mg/kg at 80-100 cm.