广西山地草甸土的形成特点及其理化性质

THE FORMING CHARACTERISTICS AND PHYSICAL AND CHEMICAL PROPERTIES OF MOUNTAIN MEADOW SOIL IN GUANGXI

本文根据长期野外调查研究,认为广西山地草甸土是在一定海拔高度和特定地形条件下经过人为毁林后生长草甸植被发育成的地域性土壤,分布在各中、低山地的黄壤与灰化黄壤的垂直过渡带之中;成土特点有明显的腐殖质累积过程和一定程度的潴育化过程;土壤剖面分化不甚明显,自然肥力高,有农牧利用价值。

Through a long-term field investigations for soil, it is discovered that the regularity of having taken the mountain meadow soil as the uppest layer structure of the soil's vertical belt of Guangxi is inexistent in fact. It's considered by author that the mountain meadow soil in Guangxi, which is situated on a certain elevation (1,000—1,400m) and specific landform (platform of mountain and intermountain basin), and which grows up the meadow vegetation after man-made-destroyed forest, is a type of regional soil. In each middle and low mountain, it has a distribution in vertical soil belt between mountain yellow soil and mountain podzolized yellow soil. The parent material of the soil is mainly residual—cumulate deposit of weathering sandstone and shale. It has thecharacteristics of apparent humification process and certain extent oxidation-reduction process in its soil forming process. The differences among each soil layer on the profile are not quite evident. With natural rich fertility, the soil may suit for farming and animal husbandry in the maintain areas, if the flood defence and drainage installations are built well.