赤红壤丘陵坡地不同侵蚀部位土壤养分和微生物特征变异性研究

对华南赤红壤丘陵坡地不同侵蚀部位土壤养分和微生物特性的变异性进行了对比分析。结果表明:水土流失对赤红壤丘陵坡地土壤pH、有机质、全氮、碱解氮、速效磷和速效钾都有较大的影响,而对全磷和全钾影响较小;随着土壤侵蚀程度的加剧和植被的破坏,土壤微生物总数逐渐减少,土壤基础呼吸和土壤诱导呼吸显著下降;在没有草本植物的情况下,仅有人工荷木并不能起到明显的水土保持作用,近地表覆盖的草本植物应是水土保持植被建设必不可少植物类群。

Study on Variation of Soil Nutrient and Microbe on Different Erosion Position of Hilly Slope in Latosolic Red Soil Region

The variation of soil nutrient and microbe on different erosion position of hilly Slope in the latosolic red soil region were studied.The result showed that changes of soil pH,organic matter,total N,alkali-hydrolyzable N,available P and K were very obvious,but total P and K were not significant in different erosion position.With intensifying of soil erosion and vegetation destroyed,soil microbial quantity decreased gradually,and intensity of soil basal respiration(SBR) and substrate induced respiration(SIR) declined significantly.Under no grassland vegetation,artificial Schima superba can not conserved obviously soil and water.Grass vegetation should be very necessary in soil and water conservation.