[1]YANG En,WANG Baorong,YAO Hongjia,et al.Dynamics of Particulate and Mineral-Associated Organic Carbon During the Development of Biological Soil Crusts in the Loess Plateau[J].Research of Soil and Water Conservation,2023,30(01):25-33,40.[doi:10.13869/j.cnki.rswc.20220427.001]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 01
Page number:
25-33,40
Column:
Public date:
2023-01-10
- Title:
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Dynamics of Particulate and Mineral-Associated Organic Carbon During the Development of Biological Soil Crusts in the Loess Plateau
- Author(s):
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YANG Enü1, WANG Baorong2,3, YAO Hongjia1, HUANG Yimei4, AN Shaoshan1,3
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(1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China; 3.University of Chinese Academy of Sciences, Beijing 100049, China; 4.College of Natural......)
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- Keywords:
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sandy soil; development stage; biological soil crust; particulate organic carbon; mineral-associated organic carbon
- CLC:
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S154.1
- DOI:
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10.13869/j.cnki.rswc.20220427.001
- Abstract:
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Particulate organic carbon(POC)and mineral-associated organic carbon(MAOC)are important soil organic carbon pools, and changes in their proportions determine the turnover and stability of soil organic carbon(SOC). Studying the content and proportion of POC and MAOC under the development of biological soil crusts in sandy land is important for deep understanding of the formation and stabilization mechanism of organic carbon during initial soil formation. The field experiment was performed in the Liudaogou, Shenmu(northern of the Loess Plateau), Shaanxi Province, China. All sites have similar orientation and inclination. Bare sand and four biocrusts formation stages include algae, algae-moss, moss-algae, and moss. Algae-moss and moss-algae stages refer to algae-dominated biocrusts(the coverage of algae>80% and moss<0%)and moss-dominated biocrusts(the coverage of moss>80% and algae<20%), respectively. The changes of POC and MAOC in BSCs, 0—2 cm, 2—10 cm, and 10—20 cm soil layers were studied, respectively. The results showed that:(1)the rate of increase of POC was greater than MAOC in BSCs soil layer, and MAOC was in a saturated state;(2)microbe-derived organic carbon mainly contributed to organic carbon accumulation in BSCs and 0—2 cm soil layer, and plant-derived organic carbon mainly contributed to organic carbon accumulation in 2—10 cm and 10—20 cm soil layers;(3)the concentrations of POC and MAOC decreased with the increase of soil layer, and increased with the development of crust;(4)POC and MAOC had a significant positive correlation with SOC, indicating that crust colonization and development could significantly promote the accumulation of soil organic carbon. These results indicate that the establishment and development of biological soil crusts can significantly promote the increase of POC and MAOC, and they contribute to the sequestration of soil organic carbon. The contribution of MAOC to SOC dominates in the early soil development process. However, when the MAOC tends to be saturated due to the lack of clay content in sandy soil, the increase of SOC may be mainly realized by the accumulation of POC.