Spatial variability characteristics of slope soil nutrients in small watershed of the middle of Shandong Province
鲁中山区小流域坡面侵蚀土壤养分空间分异特征研究

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.