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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (5): 221-231.DOI: 10.7522/j.issn.1000-694X.2022.00041

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Characteristics and influencing factors of soil organic carbon in the process of desertification in Horqin Sandy Land

Meng Yan1(), Xuyang Wang2(), Liye Zhou1(), Yuqiang Li2   

  1. 1.Inner Mongolia Minzu University,Tongliao 028000,Inner Mongolia,China
    2.Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2022-01-23 Revised:2022-03-17 Online:2022-09-20 Published:2022-09-22
  • Contact: Xuyang Wang,Liye Zhou

Abstract:

Horqin Sandy Land is a typical area for the development of desertification and a key area for desertification control in semi-arid areas of China. This study takes Horqin Sandy Land as the study area, takes sandy land at different stages of desertification reversal as the research object, and adopts the method of space instead of time through field investigation and indoor analysis. on the regional scale, the response law of soil organic carbon to desertification process was discussed, and the dominant factors of spatial variation of soil organic carbon in this region were explained with climate, vegetation and topographic factors. The results show that: (1) with the aggravation of desertification, the content of soil organic carbon shows as follows: sparse forest grassland (non-desertification) > fixed sandy land (mild desertification) > semi-fixed sandy land (moderate desertification) > semi-mobile sandy land (severe desertification) > mobile sandy land (extreme sandy desertification). (2) compared with sparse forest grassland, the soil organic carbon density of fixed sandy land, semi-fixed sandy land, semi-mobile sandy land and mobile sandy land decreased by 29.1%, 49.3%, 62.9% and 84.1%, respectively. (3) with the development of desertification, the soil texture coarsening phenomenon occurred, that is, the content of medium and fine sand significantly increased, while the content of soil fine particles (ultra-fine sand and clay) decreased significantly. (4) in the process of desertification in Horqin sandy land, the loss of soil clay particles is the main reason for the coarsening of soil and the decrease of soil organic carbon content, while the change of pH is less affected by desertification. (5) Climate factor is the main factor that leads to the influence of longitude and latitude on SOC content, while topography factor takes the second place.

Key words: soil organic carbon, Horqin Sandy Land, desertification, regional scale, principal component analysis

CLC Number: