花岗岩崩岗侵蚀劣地的生态恢复试验研究

EXPERIMENTS ON ECOLOGICAL RESTORATION OF THE SLOPE DISINTEGATION IN AN ERODED GRANITE AREA

花岗岩崩岗侵蚀是红壤区最严重的侵蚀方式，本研究根据生态学的原理和方法．探索了花岗岩崩岗区水土流失治理和生态恢复的途径，提出了植被重建的模式。

lope disintegration is an imPOrtant form of soil erosion in tropical and subtropical red earthregions of China. With the ecological and economic principles and methods, experiments of ecological restoration and soil erosion control on the slope disintegration land have been made. Combined with endineering measures, mixed vegetation including arbor, shrub, grass and vine hasbeen developed on the eroded, degraded land in the ganite area of Cangwu County, Guangxi. Itis shown that the ecoenvironment has been much improved and eec-economic benefitS have beengained after 4 years' practices. The vegetation cover degree increased from 10 % to 60 %--80 %,and the output of green manures and forage grasses was 4. 90 t/hm2. a (converted into dry weight1. 85t/hm2. a) The amounts of runoff and soil erosion respectively decreased by 70 % and 90 %.In the soil of the shrub and grass land total N, P and K enhanced by 7%-- 1 23 %, available N,P, K by 12%-900%, organic matter by 31 %--64% and CEC by 9% --30%. Based on theexperimentS, the way and model of ecological restoration for eroded granite region are discussed.