Application of Holdridge life-zone model based on the terrain factor in Xinjiang Automous Region

Article type: Research Article

Authors: NI, Yong-ming | OUYANG, Zhi-yun | WANG, Xiao-ke

Affiliations: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

Note: [] Corresponding author. E-mail: nym2003@126.com

Abstract: This study improved the application of the Holdridge life-zone model to simulate the distribution of desert vegetation in China which gives statistics to support eco-recovery and ecosystem reconstruction in desert area. This study classified the desert vegetation into four types: (1) LAD: little arbor desert; (2) SD: shrub desert; (3) HLHSD: half-shrub, little half-shrub desert; (4) LHSCD: little half-shrub cushion desert. Based on the classification of Xinjiang desert vegetation, the classical Holdridge life-zone model was used to simulate Xinjiang desert vegetation's distribution and compare the Kappa coefficient result of the model with table of accuracy represented by Kappa values. The Kappa value of the model was only 0.19, it means the simulation result was poor. To improve the life-zone model application to Xinjiang desert vegetation type, a set of plot standards for terrain factors was developed by using the plot standard as the reclassification criterion to climate sub-regime. Then the desert vegetation in Xinjiang was simulated. The average Kappa value of the second simulation to the respective climate regime was 0.45. The Kappa value of final modeling result was 0.64, which is the better value.The modification of the model made it in more application region. In the end, the model's ecological relevance to the Xinjiang desert vegetation types was studied.

Keywords: Xinjiang, desert vegetation types, Holdridge life-zone, terrain, climate regime

Journal: Journal of Environmental Sciences, vol. 17, no. 6, pp. 1042-1046, 2005