JOURNAL OF NATURAL RESOURCES ›› 2012, Vol. 27 ›› Issue (11): 1870-1880.doi: 10.11849/zrzyxb.2012.11.006

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Analysis of Spatial Distribution Features of Potential Vegetation NPP in Inner Mongolia Based on the IOCS

ZHAO Jun, SHI Yin-fang, WANG Da-wei   

  1. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
  • Received:2011-11-28 Revised:2012-02-06 Online:2012-11-20 Published:2012-11-20

Abstract:

Daily average temperature and precipitation observations during 1985-2009 are collected from 94 meteorological stations in Inner Mongolia and its surrounding areas. On the basis of Integrated Orderly Classification System (IOCS), the net primary productivity (NPP) of potential vegetation types in Inner Mongolia are simulated with the model of classification indices. Then the spatial distribution characteristics and the relationships between NPP and climatic factors are analyzed, and the results are shown as follows: 1) The NPP of Inner Mongolia shows nearly meridional distribution; the mean NPP is from 0 to 366.5 gC·m-2·a-1, and the bigger value region is located in the northeast of Greater Hinggan Mountains. 2) The potential vegetation type of the largest NPP is cool temperate perhumid mixed coniferous broad-leaved forest and its value is 231.8 gC·m-2·a-1; the second is warm temperate-subhumid forest steppe and its value is 222.8 gC·m-2·a-1; besides the minimum is warm temperate-extrarid warm temperate zonal desert, the value of which is only 0.6 gC·m-2·a-1. 3) For all the potential vegetation types, the maximum contribution to carbon sequestration potential is cool temperate-semiarid temperate typical steppe, the value of which is 23.6%; the minimum is cold temperate-semiarid montane steppe and the value is close to zero. 4) Each potential vegetation NPP has a higher partial correlation with moisture-humidity than annual cumulative temperature; by the IOCS, which is based on a moisture index, expressed as the ratio between annual precipitation and >0℃ annual cumulative, we can confirm that precipitation is the main factor, which impacts the NPP of potential vegetation types. 5) In Inner Mongolia, the NPP of potential vegetation types show the characteristics of wet-dry and latitude zonality obviously, and the NPP increases gradually as the change is with cold temperate→cool temperate→warm temperate and the diversification is with semiarid→subhumid→humid→perhumid; however, warm temperate-extrarid warm temperate zonal desert and warm temperate-arid warm temperate zonal semidesert do not comply with this law; the main reason is that higher temperature and less precipitation cannot meet the needs of vegetation growth.

Key words: IOCS, potential vegetation, NPP, classification indices model, Inner Mongolia

CLC Number: 

  • Q948.1