欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 方法与技术 • 上一篇    下一篇

粤北石漠化地区植被退化过程及其建模

陆冠尧1,2**,李森2,魏兴琥1,梁钊雄1,熊彦1,黄金国1   

  1. 1佛山科学技术学院国土资源环境与旅游研究中心, 广东佛山 528000; 2西北师范大学地理与环境科学学院, 兰州 730070)
  • 出版日期:2013-06-10 发布日期:2013-06-10

Vegetation degradation and its modeling in rock desertification area of northern Guangdong, South China. 

LU Guan-yao1,2**, LI Sen2, WEI Xing-hu1, LIANG Zhao-xiong1, XIONG Yan1, HUANG Jin-guo1   

  1. (1Resources and Environmental Science Research Institute, Foshan University, Foshan 528000, Guangdong, China; 2 Department of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China)
  • Online:2013-06-10 Published:2013-06-10

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。

 

关键词: 夏玉米, 土壤水分, 遥感, 水分亏缺指数

Abstract: 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 degradation and its modeling in rocky desertification area. With the development of rocky desertification, the plant community structure in the study area became increasingly simpler, with the dominant plant species evolved from Pistacia chinensis + Boehmeria nivea + Vitex negundo + Pueraria phaseoloides to Pistacia chinensis + Artemisia carvifolia + 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 layer, 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 significantly 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 Guangdong.

Key words: remote sensing, water deficit index (WDI)., soil moisture, summer maize