施用生物炭对红壤坡地土壤性质改良效果的试验研究

Experimental Study on Improvement Effect of Biochar Application on Soil Properties of Red Soil Slope Land

选择红壤侵蚀劣地平直坡面、红壤侵蚀劣地竹节沟坡面、红壤坡地果园3种典型坡地土壤,以稻壳生物炭为土壤改良剂,研究了施用生物炭对南方红壤坡地的改良效果。试验结果表明:在侵蚀劣地平直坡面上施用1.0 kg/m^(2)生物炭或者在竹节沟内施用0.5 kg/m^(2)生物炭均可以明显提高土壤的入渗性,增加土壤肥力,促进植被生长;在甜柚坡地果园施用2.0 kg/m^(2)生物炭+减少施肥量0%~20%可以明显增加土壤的有效磷含量,并增加果树的产量。总之,施用适量的生物炭对于南方侵蚀劣地坡地和果园坡地的土壤均具有良好的改良效果。

In order to study the effect of biochar application on the improvement of soil properties of red soil slope land in south China,three typical slope land soils were selected,namely,the flat slope of red soil erosion inferiority,the Zhujiegou slope of red soil erosion inferiority and the orchard of red soil slope land,and rice hull biochar was taken as the soil conditioner.The results showed that the application of 1.0 kg/m^(2) biochar in the flat slope of red soil erosion inferiority or 0.5 kg/m^(2) biochar in the Zhujiegou slope of red soil erosion inferiority can significantly improve the soil infiltration,increase the soil fertility,and promote the growth of vegetation.The application of 2.0 kg/m^(2) biochar and reducing 0%~20%of fertilization amount in sweet pomelo slope orchard can significantly increase soil available phosphorus content and increase fruit yield.In Conclusion,the application of proper amount of biochar has a good effect on the soil improvement of red soil erosion inferiority and the orchard of red soil slope land in south China.