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[1]LIU Wenmin,TIAN Peng,LIU Likun,et al.Evaluation of Grassland Soil Quality in Typical Desertified Areas of Qinghai-Tibet Plateau[J].Research of Soil and Water Conservation,2022,29(02):118-124.

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Evaluation of Grassland Soil Quality in Typical Desertified Areas of Qinghai-Tibet Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 02 Page number: 118-124 Column: Public date: 2022-03-20

Title:: Evaluation of Grassland Soil Quality in Typical Desertified Areas of Qinghai-Tibet Plateau

Author(s):: LIU Wenmin¹, TIAN Peng², LIU Likun¹, ZHAO Guangju^1,3, MU Xingmin^1,3; (1.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; 3.Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China)

Keywords:: soil quality evaluation; land desertification; principal component analysis; soil properties; Qinhai-Tibetan Plateau

CLC:: S152; S153; S158

DOI:: -

Abstract:: In order to explore the changes of grassland soil quality in the desertification area of the Qinghai-Tibet Plateau, the principal component analysis method was used to screen the representative soil quality indexes, construct the minimum data set, calculate the soil quality index SQI(soil quality index), and evaluate the characteristics of soil quality changes under different degrees of desertification in three typical desertification areas of Haiyan County, Gonghe County and Guinan County of the Qinghai Tibet Plateau. The results show that:(1)with the decrease of desertification degree, the mean aboveground biomass of grassland in three typical desertification areas increased from 0 to(0.8±0.18)kg/m²; the contents of soil organic matter, total nitrogen, total potassium, total phosphorus, available potassium, available phosphorus and alkali hydrolyzable nitrogen increased, and the soil cation exchange capacity(CEC)increased by 87.28%; the soil bulk density decreased by 33.62%;(2)in the three typical desertification areas, under different desertification degrees, the soil quality in Senduo Town, Guinan County is the best, followed by Tiegai Township, Gonghe County, and the soil quality in Sanjiaocheng Town, Haiyan County is the worst;(3)there is a very significant correlation between the soil quality index of the minimum data set and the full data set, which shows that it is effective to use the minimum data set method instead of the full data set method to evaluate the soil quality of sandy grassland in typical areas. In conclusion, the soil quality of grassland in desertification areas gradually decreases with the aggravation of desertification degree, and there are spatial differences in soil quality of grassland in different desertification areas.

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Last Update: 2022-04-20