粤北典型岩溶区石漠化过程中植被退化对土壤有机质和养分含量的影响  

Effect of vegetation degradation on soil organic matte and nutrient in process of rocky desertification in typical karst area of Northern Guangdong

作　　者：黄金国[1] 魏兴琥[1] 王兮之[1] 周红艺[1] 李辉霞[1] 

机构地区：[1]佛山科学技术学院空间信息与资源环境系,广东佛山528000

出　　处：《中国土壤与肥料》2014年第1期15-18,共4页Soil and Fertilizer Sciences in China

基　　金：广东省哲学社会科学"十二五"规划项目(GD12CGL01);国家自然科学基金项目(31170486;31070426);广东省自然科学基金项目(S2012010009272)

摘　　要：以阳山县江英镇为例,通过典型样地调查和取样分析,研究了粤北典型岩溶区石漠化过程中植被退化对土壤有机质及养分含量的影响。结果表明:(1)随着石漠化程度的加深,石灰岩植被的生境向旱生化和岩生化发展,植物群落结构越来越趋于简单。(2)石漠化过程与土壤养分状况有密切关系,随着土地石漠化的发展,土壤有机质、全N,以及碱解N、有效P、速效K含量呈现出显著下降趋势,土壤逐步贫瘠化。(3)土壤有机质和养分含量下降与植被退化形成正反馈关系,并具有退化方向的一致性和退化过程的同步性。Taking the Jiangying town in Yangshan County as an example, the effect of vegetation degradation on soil nutrient in rocky desertifieation process in typical karst area of Northern Guangdong was studied by typical samples plots investigation method. The results showed that ： （ 1 ） With the development of the rocky desertification, the territory of the limestone veg- etation was replaced by some more drought and more rocky species, the structure of vegetation community tend to be more and more simple. （2） There was a close relationship between rocky desertification process and soil nutrient condition, with the development of the rocky desertification, the nutrient contents of soil organic matte, total N, alkali-hydrolyzed N, a- vailable P and available K have showed a decreased obviously trend, the soil became more and more infertility. （3） The degradation of soil nutrient contents has a positive relation with vegetation degradation, and they have the consistency in the degradation direction and the synchronism in the degradation process.

关 键 词：石漠化过程 植被退化 土壤有机质和养分 粤北典型岩溶区 

分 类 号：Q948.15[生物学—植物学] S158.3[农业科学—土壤学]