大巴山北坡棕色石灰土性质研究

Studies on the Properties of Brown Rendzina on the North Slope of the Daba Mountains

研究了大巴山北坡不同海拔高度棕色石灰土剖面特征及理化性质,并将其作为石灰岩土类的棕色石灰土亚类从地带性棕壤及黄棕壤中划出。棕色石灰土没有明显的层次分化,呈较强的石灰反应;粘粒硅铝率及硅铝铁率高于地带性土壤,其数值主要受土壤发育程度的影响,元素淋失顺序为Fe>Si>Al,明显不同于地带性土壤,矿物组成以水云母及蛭石为主;腐殖质性质及矿物组成具有明显的地带性烙印。

Based on the study of profile features and chemical and physicl properties of brown rendzina in the north slope of the Daba mountains, the brown rendzina was classified as a subgroup of calcareous lithosol from the zonal yellow brown earth and brown earth in this paper. The brown rendzina has no apparent layer development, appearing to have the strong calcaeous reaction. The silica-alumina and silica-sesquioxide percentages were much higher than those of the zonal soil, whose values are mainly affected by soil development. The leaching order of elements was Fe Si Al, which is obviously different from that of the zonal soil. The illite and vermiculite were dominated in the mineral composition of clay. The humus properties and mineral composition of clay have the distinct features of zonality.