作　　者： ; ; ; ; ; ;

机构地区： 国土资源

出　　处： 《生态学杂志》 2013年第6期1629-1635,共7页

摘　　要： 在粤北石漠化地区选取不同石漠化阶段的样地,运用面上调查和定位观测相结合的方法,研究石漠化地区植被退化及构建其理论模型。结果表明:随石漠化程度的加深,粤北石漠化土地的植物群落结构越来越趋于简单,植被演替趋势为(黄连木、苎麻、黄荆、三裂叶野葛)→(黄连木、青蒿、野菊)→(五节芒、野古草、牛筋草)→黄叶凤尾藓,群落层片从4层变为1层,物种减少比例从0→14%→46%→86%,土壤有机质、全氮、速效氮、速效磷和速效钾含量也随石漠化程度的加深呈极显著下降。植被演替退化可以用不同物种关于某种资源的竞争模型来描述,由此建立了粤北石漠化地区植被退化的模型。 In this paper, site investigation and fixed position observation were conducted in the sampling plots with four different stages of rock desertification in rocky desertification area of northern Guangdong to study the vegetation degradati area. With the development of rocky desertification, area became increasingly simpler, with the dominant on and its modeling in rocky desertification the plant community structure in the study plant species evolved from Pistacia chinensis ＋ Boehmeria nivea ＋ Vitex negundo ＋ Pueraria phaseoloides to Pistacia chinensis ＋ Artemisia carvi- folia ＋ Dendranthema indicum to Miscanthus floridulus ＋ Arundinella anomala ＋ Eleusine indica to Fissidens zippelianus. The community＇ s layer was from 4 layers to 3 layers to 2 layers to 1 lay- er, and the proportion of species reduction was from 0 to 14% to 46% to 86%. The soil organic matter, total N, available N, available P, and available K contents were all decreased signifi- cantly with the development of rocky desertification. Vegetation degradation could be described by the competition models of different species to certain kinds of resources, and thus, a model was established for the vegetation degradation in rocky desertification area of northern Guang- do ng.

关 键 词： 石漠化 植被退化 建模 粤北

领　　域： [生物学]