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Journal of Desert Research ›› 2026, Vol. 46 ›› Issue (2): 301-311.DOI: 10.7522/j.issn.1000-694X.2025.00097

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Soil quality evaluation of different site types in wind erosion area of wide valley in the middle and lower reaches of Yarlung Zangbo River Basin

Hang Gong1(), Hao Liu1, Songyan Chen5, Guodong Ding1,2,3,4()   

  1. 1.School of Soil and Water Conservation /, Beijing Forestry University,Beijing 100083,China
    2.MOE Engineering Research Center of Forestry Ecological Engineering /, Beijing Forestry University,Beijing 100083,China
    3.Key Laboratory of Soil and Water Conservation,State Forestry and Grassland Administration /, Beijing Forestry University,Beijing 100083,China
    4.Ningxia Yanchi Maowusu Ecosystem National Positioning Observation Research Station, Beijing Forestry University,Beijing 100083,China
    5.College of Resources and Environment,Xizang Agriculture and Animal Husbandry University,Linzhi 860000,Xizang,China
  • Received:2025-03-10 Revised:2025-04-24 Online:2026-03-20 Published:2026-04-13
  • Contact: Guodong Ding

Abstract:

As a part of the fragile ecological area of the Qinghai-Tibet Plateau, the soil quality of the Yarlung Zangbo River Basin is directly related to the regional ecological security. Exploring the characteristics of soil quality changes under different site types in the wind erosion area of the middle and lower reaches of the Yajiang River Basin can provide a theoretical basis for ecosystem protection and sand control. In this study, six typical site types (grassland, forest land, cultivated land, flood land, fixed sand land, and mobile sand land) in the study area were taken as the research objects. Based on the monitoring of nine soil physical and chemical properties such as soil mechanical composition and soil nutrients (organic matter, total nitrogen, total phosphorus, total potassium, available potassium and available phosphorus), the minimum data set (MDS) was established by correlation analysis and principal component analysis, and the soil quality under different site types was quantitatively evaluated according to the weighted summation index method. The results showed that : (1) The soil texture of different site types and different depths in the study area did not change significantly, and the soil particle size composition was: sand > silt > clay. The highest proportion of soil clay content was forest land (0.9%), and the highest proportion of silt content was cultivated land (27.0%). The soil of flood land was mainly composed of sand (90.7%), and its clay (0.1%) content was the lowest. (2) There are obvious differences in soil chemical properties under different site types in the study area, and it decreases with the increase of soil depth as a whole, which has certain surface aggregation. (3) The minimum data set of soil quality index evaluation in the study area included sand volume percentage, available potassium mass fraction, and total potassium mass fraction, and their weights were 0.55,0.30 and 0.14, respectively. The overall soil quality was grassland (0.55) > cultivated land (0.54) > forest land (0.53) > fixed sand land (0.42) > moving sand land (0.32) > river beach land (0.27). The evaluation results have an important reference value for sustainable soil management in this area.

Key words: site type, soil quality, soil physical and chemical properties, yarlung zangbo River Basin.

CLC Number: