Acta Geographica Sinica ›› 2012, Vol. 67 ›› Issue (1): 13-26.doi: 10.11821/xb201201002

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Ecological Effects of Longitudinal Range-Gorge Land Surface Pattern and Its Regional Differentiation

PAN Tao1, WU Shaohong1,2, HE Daming3, DAI Erfu1, LIU Yujie1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Institute of Tibetan Plateau Research, Beijing 100085, China;
    3. Asian International Rivers Center, Yunnan University, Kunming 650091, China
  • Received:2011-01-09 Revised:2011-09-22 Online:2012-01-20 Published:2012-01-20
  • Supported by:
    National Basic Research Program of China, No.2003CB415101

Abstract: The land surface pattern of Longitudinal Range-Gorge Region with towering mountains and deep valleys arranged vertically side by side has significant effects on physical environments and eco-geographical differentiation in Southwest China. Based on 1:50,000 DEM data, monthly meteorological and hydrological records, NDVI and NPP derived from MOD13 and MOD17, together with 1:1,000,000 vegetation types map, we select surface atmospheric water vapor content, precipitation, aridity/humidity index, and surface runoff as water indices; air temperature and accumulated temperature as temperature indices, and solar radiation as a heat index to study the hydrothermal pattern, regional differentiation of ecosystem structure and function and main influencing factors. The ANUSPLIN model, wavelet analysis, GIS spatial analysis and landscape pattern analysis were used to reveal the effects of land surface pattern on eco-geographical regional differentiation. Results show that the water, temperature and heat have significant differences along the latitudinal direction with intermittent difference and longitudinal direction with continuous extension, which reflects the special "corridor-barrier" effect of longitudinal range-gorge terrain, in which the vertical mountain and valleys on the surface of natural material and energy transport mainly showed significant north-south corridor and diffusion effects and the role of east-west barrier and barrier effect. The longitudinal range-gorge terrain also have important impacts on the spatial pattern of vegetation landscape diversity, ecosystem structure and function, which is the main influencing factor affecing the spatial distribution of vegetation landscape diversity and ecosystems pattern. Wavelet variance analysis reflects the spatial anisotropy of environmental factors as well as NDVI and NPP. The wavelet coherence reveals the spatial distribution of NDVI and NPP influencing factors, and also the quantitative degree of control. Conclusions believe that the longitudinal range-gorge land surface pattern is the main influencing factor of the eco-geographical elements. Under the interaction of the zonality law and the non-zonality "corridor-barrier" effects, the spatial differentiation formed in the eco-geographical system.

Key words: Southwest China, Longitudinal Range-Gorge Region (LRGR), "corridor-barrier" effect, eco-geographical region, spatial differentiation