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Biocrusts impact soil properties and ecological stoichiometry characteristics in frozen ground regions on the Qinghai-Tibet Plateau

引用

Soil Ecology Letters 2024年第3期6卷 151-162页

作者： Jiao Ming Yunge Zhao Yingying Sun Zhe Liu The Research Center of Soil and Water Conservation and Ecological Environment Chinese Academy of Sciences and Ministry of EducationYangling 712100China College of Soil&Water Conservation Science and Engineering(Institute of Soil and Water Conservation) Northwest A&F UniversityYangling 712100China Institute of Soil and Water Conservation Chinese Academy of Sciences&Ministry of Water ResourcesYangling 712100China Shaanxi Provincial Land Engineering Construction Group Co. Ltd.Xi'an 710075China

Biocrusts(BSCs)are widely distributed in frozen ground regions on the Qinghai-Tibet Plateau,and they are considered an important component of cold ***,the specific impacts of BSCs on frozen soil remains relatively *** aim of our study was to clarify the influence of BSCs(light BSCs and dark BSCs in two different succession stages)on the physical properties and ecological stoichiometry characteristics of frozen *** results showed that BSCs increased the silt particle content in 20–40 cm soil layer,leading to a decrease in soil bulk *** the field water capacity increased about 10%–40%compared to bare ***,BSCs significantly increased the contents of soil organic carbon(SOC,22.6–30.8 g kg^(-1))and total nitrogen(TN,2.1–2.8 g kg^(-1))in the upper 40 cm soil layer,both of them were approximately 1.3–2.0 and 1.3–4.0 times higher than those observed in bare ***,BSCs did not have significant influence on soil total phosphorus(TP).BSCs had a significant impact on the stoichiometric ratios within 40 *** C/N ratios of the two types of BSCs ranged from 8.8 to 13.5,the C/P ratios ranged from 6.6 to 13.8,and the N/P ratios ranged from 0.6 to 1.2,which were all higher than those of the bare *** were no significant differences among the C/N,C/P,and N/P ratios between two types of ***,the increment of C/P and N/P ratios of dark BSCs were significantly higher than those of light BSCs within 0–30 cm,which indicated that a reduction in the availability of phosphorus during the later stages of BSCs *** findings provided a theoretical basis for further research on the ecological functions of BSCs in frozen ground regions.

关键词： biocrusts frozen soil soil properties stoichiometry characteristics Qinghai-Tibet Plateau

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