Soil carbon and nitrogen in the active layers of the permafrost regions in the Three Rivers’ Headstream

• Published in: Environmental earth sciences Vol. 72; no. 12; pp. 5113 - 5122
• Main Authors: Hu, Guanglu, Fang, Hongbing, Liu, Guimin, Zhao, Lin, Wu, Tonghua, Li, Ren, Wu, Xiaodong
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.12.2014; Springer Berlin Heidelberg; Springer; Springer Nature B.V
• Subjects: Animal and plant ecology; Animal, plant and microbial ecology; Biogeosciences; Biological and medical sciences; bulk density; Carbon; Climate change; correlation; Correlation analysis; Earth and Environmental Science; Earth Sciences; Earth, ocean, space; Economic conditions; Environmental Science and Engineering; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Geochemistry; Geology; Global warming; greenhouse gas emissions; Greenhouse gases; Hydrology/Water Resources; Inorganic carbon; Marine and continental quaternary; Meadows; Nitrogen; nitrogen content; Organic carbon; Original Article; Permafrost; plant communities; Rivers; Socioeconomics; Soil formation; soil organic carbon; Soils; steppe soils; Steppes; Surficial geology; Synecology; Terrestrial ecosystems; Terrestrial Pollution; Vegetation; Water resources management; China; Qinghai China; Xizang China; Far East; Asia; Qinghai-Xizang Plateau; Tibetan Plateau; Three Rivers’ Headstream; Permafrost; Vegetation communities; Total nitrogen; Soil inorganic carbon; Soil organic carbon; rivers; active layer; nitrogen; fine-grained materials; vegetation; Three Rivers' Headstream; steppes; depth; global warming; Meadow soils; correlation; permafrost; bulk density; plateaus; pedogenesis; pH; soils; particles; organic carbon
• ISSN: 1866-6280; 1866-6299
• DOI: 10.1007/s12665-014-3382-7

The pedogenesis, soil organic carbon (SOC), soil inorganic carbon (SIC), hot water-soluble organic carbon (WSOC) and total nitrogen (TN) of the active layers were examined beneath four typical vegetation communities in the permafrost regions in the Three Rivers’ Headstream region in the Qinghai-Tibetan Plateau. In all soil areas, except for in the steppe, the SOC and TN showed rapidly decreasing trends with increasing depth. The highest SOC, WSOC and TN contents were found in the wet meadow, with contents in the eluviate layer being 180.9, 40.2 and 10.9 g kg⁻¹, respectively. In the steppe, the average SOC, WSOC and TN at 180 cm depth were 6.2, 0.67 and 0.59 g kg⁻¹, respectively. The SIC contents showed increasing trends with increasing depth in the soils of the steppe community. The correlation analysis suggested that the moisture and fine particle fractions positively correlated to SOC, TN and WSOC, while bulk density and pH negatively correlated to SOC, TN and WSOC. The SOC and TN were significantly related to bulk density. The SIC was positively correlated with pH but negatively correlated with SOC, TN and WSOC. The C/N ratios were negatively correlated with pH while positively correlated with SOC, TN and fine soil particles. The results suggest that the SOC in the wet meadow soils in the permafrost regions of Qinghai-Tibetan have the largest potential contributions to the emissions of greenhouse gases and cause future global warming.