THE EFFECT OF NANO-BIOCHAR ON SOIL, WATER, AND NUTRIENT LOSS OF A SLOPING LAND WITH DIFFERENT VEGETATION COVERS ON LOESS PLATEAU OF CHINA

Nano-biochar with unique characteristics compared to common biochar has been confirmed to promote soil physical properties.Highly weathered soils in arid and semi-arid areas are characterized by low soil nutrients and high erosion potential.This study evaluated the influences of nano-biochar made from oak tree branches on the soil, water, and nutrient conservation on a sloping land of the Chinese Loess Plateau.Five nano-biochar rates (0.0%, 0.1%, 0.5%, 0.7%, and 1.0% by mass, equal to 0 t/ha, 0.0263 t/ha, 0.131 t/ha, 0.184 t/ha, 0.268 t/ha) were applied in three bands with simulated rainfall plots (1.0 m in length, 1.0 m in width) with five different vegetation covers (bare, alfalfa, bean, Caragana microphylla, and corn).A simulated typical rainfall event of 90 mm h -1 was performed for all the treatments.Experimental results indicated that the initial runoff time was delayed with the increasing nano-biochar contents.Compared to the treatments with no biochar application, soil, water, and nutrient losses in runoff significantly decreased.The conservation effect of nano-biochar was the most significant in the alfalfa plot.Soil containing 0.7% nano-biochar (0.131 t/ha) with alfalfa planting mollusc.This study provides an effective method for soil water and nutrient conservation.