桂西喀斯特石漠化区不同岩性土壤与植被调查分析

Diagnoses of soil and vegetation upon different rock in karst rocky desertification areas in the west of Guangxi Zhuang Autonomous Region

通过对桂西喀斯特石漠化较严重的都安、东兰、巴马、凤山、乐业等县的野外调查发现,该地区成土母质分别起源于可溶性较强的石灰岩和白云质石灰岩地层(简称石灰岩组合基岩)和可溶性较弱的灰质白云岩或白云岩地层(简称白云岩组合基岩)。这2类基岩发育的土壤无论是土层厚度、pH值、有机质含量,还是全氮、全磷和全钾等含量都存在一定的差异,其植被覆盖情况也有一定的差别,在石漠化治理中应根据不同岩性及其土壤和植被特点采取不同的生态恢复措施。

After field investigation to Du＇ an county, Donglan county, Bama county, Fengshan county and Leye county, where there are many karst rocky desertification areas in the west of Guangxi Zhuang Autonomous Region, it is found that the soil comes of two kinds of stone heads, i.e. limestone and dolomite-like limestone stone head with higher solvency （abbr. limestone assemble stone head） and gray dolomite or dolomite stone head with lower solvency （abbr. dolomite assemble stone head）. Diagnoses indicates that the soil from different assemble stone head has different characteristics not only in pH, but also in the content of organic matter, and N, P, K. Other more, the vegetation cover is different too. So, different measures should be taken according to different lithology when to manage the karst rocky desertification area.