Contributions of three types of biocrusts to soil carbon stock and annual efflux in a small watershed of Northern Chinese Loess Plateau
文献类型：期刊论文
| 作者 | Dou, Weiqiang4; Xiao, Bo1,2,3; Wang, Yanfeng5; Kidron, Giora J.6 |
| 刊名 | APPLIED SOIL ECOLOGY
 |
| 出版日期 | 2022-11-01 |
| 卷号 | 179页码:13 |
| ISSN号 | 0929-1393 |
| 关键词 | Biological soil crust Moss biocrust Cyanobacteria biocrust Soil respiration Soil organic carbon content Soil moisture and temperature |
| DOI | 10.1016/j.apsoil.2022.104596 |
| 通讯作者 | Xiao, Bo(xiaobo@cau.edu.cn) |
| 英文摘要 | Accurate estimation of soil carbon (C) stock and efflux in drylands is vital for understanding the C cycling processes and predicting global climate change. As a "living skin ", biocrusts strongly change soil C fixation and respiration, but till now it is still challenging to accurately estimate and assess biocrust's contributions to soil C stock and efflux, especially taking different types of biocrusts and annual scale into consideration. In a small representative watershed on the northern Chinese Loess Plateau, cyanobacterial crust (cyano crust), cyanobacteria and moss mixed crust (mixed crust), moss crust, and bare soil were sampled. The organic C content of the samples were determined in laboratory, and subsequently their C stocks were calculated. Moreover, the respiration rate (Rs) of biocrusts and bare soil were repetitively measured in field for a four-month period, respectively, and an optimal regression model was established based on the relationship between Rs and corresponding temperature and moisture of soil. Lastly, the daily Rs was extended to a whole year through model extrapolation, and the seasonal and annual C efflux was obtained through summing the daily respiration together. Our results showed that (i) the organic C content of three types of biocrusts were 69 %-159 % higher than that of bare soil, and the soil C stock at depth of 0-5 cm was 0.35, 0.51, 0.81, and 0.61 kg m(-2) for bare soil, cyano crust, mixed crust, and moss crust, respectively. (ii) During the measurement period, the mean Rs of the four habitats were 1.13, 2.21, 2.86, and 2.56 mu mol m(-2) s(-1), respectively, showing that the biocrusts increased Rs by 96 %-152 % in contrast to bare soil. (iii) The variations of Rs were best explained by soil temperature and moisture through the Gaussian model, which had the lowest AIC and RMSE. (iv) Based on model extrapolation, the estimated annual C efflux from bare soil, cyano crust, mixed crust, and moss crust were 228.0, 378.0, 894.0, and 679.0 g m(-2), respectively, indicating that in annual scale biocrusts increased C efflux by 66 %-292 % compared with bare soil. The seasonal variations also implied that the C efflux of biocrusts in summer and autumn were significantly higher than that in winter and spring, but they all accounted for a considerable proportion and should not be neglected. In conclusion, different types of biocrusts are the dominant contributors of soil C fixation and respiration in drylands. More importantly, the increased soil C efflux from biocrusts is highly overwhelmed by their elevated photosynthetic capacity, which make biocrusts sequestrate a considerable amount of C. These effects on soil C are highly associated with biocrust's roles in restoring degraded soil and mitigating global climate warming. |
| WOS关键词 | DIFFERENT VEGETATION TYPES ; WESTERN NEGEV DESERT ; BIOLOGICAL SOIL ; GURBANTUNGGUT DESERT ; ORGANIC-CARBON ; MICROBIAL ACTIVITY ; TENGGER DESERT ; CO2 EFFLUX ; PHYSICOCHEMICAL CHARACTERISTICS ; COMMUNITY DIVERSITY |
| 资助项目 | National Natural Science Foundation of China[42077010] ; Chinese Academy of Sciences[2019] ; Open Fund for Key Laboratory of Land Degradation and Ecological Restoration in North- western China of Ningxia University[LDER2022Z02] |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000874782100012 |
| 资助机构 | National Natural Science Foundation of China ; Chinese Academy of Sciences ; Open Fund for Key Laboratory of Land Degradation and Ecological Restoration in North- western China of Ningxia University |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/186336]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Xiao, Bo |
| 作者单位 | 1.Chinese Acad Sci & Minist Water Resources, State Key Lab Soil Eros & Dryland Farming Loess Pl, Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, State Key Lab Soil Eros & Dryland Farming Loess Pl, Inst Soil & Water Conservat, Yangling 712100, Peoples R China 3.Ningxia Univ, Breeding Base State Key Lab Land Degradat & Ecol R, Key Lab Restorat & Reconstruct Degraded Ecosyst No, Minist Educ, Yinchuan 750021, Peoples R China 4.China Agr Univ, Key Lab Arable Land Conservat North China, Minist Agr & Rural Affairs, Coll Land Sci & Technol, Beijing 100193, Peoples R China 5.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China 6.Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel |
| 推荐引用方式 GB/T 7714 | Dou, Weiqiang,Xiao, Bo,Wang, Yanfeng,et al. Contributions of three types of biocrusts to soil carbon stock and annual efflux in a small watershed of Northern Chinese Loess Plateau[J]. APPLIED SOIL ECOLOGY,2022,179:13. |
| APA | Dou, Weiqiang,Xiao, Bo,Wang, Yanfeng,&Kidron, Giora J..(2022).Contributions of three types of biocrusts to soil carbon stock and annual efflux in a small watershed of Northern Chinese Loess Plateau.APPLIED SOIL ECOLOGY,179,13. |
| MLA | Dou, Weiqiang,et al."Contributions of three types of biocrusts to soil carbon stock and annual efflux in a small watershed of Northern Chinese Loess Plateau".APPLIED SOIL ECOLOGY 179(2022):13. |
入库方式： OAI收割
来源：地理科学与资源研究所
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