中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地理科学与资源研究所
  3. 中国科学院地理科学与资源研究所
  4. 生态系统研究网络观测与模拟重点实验室
  5. 外文论文
Revegetation drives the accrual and stabilization of organic carbon in biocrusts and subsoils in the Tengger Desert, north China

文献类型：期刊论文

作者Li, Xiaojun1,4,5; Guo, Qun2,3,4; Jia, Rongliang1,4,5; Gao, Yanhong1,4,5
刊名GEODERMA
出版日期2025-08-01
卷号460页码:117437
关键词Particulate organic carbon Mineral-associated organic carbon Soil organic carbon stability Biological soil crusts Revegetation
ISSN号0016-7061
DOI10.1016/j.geoderma.2025.117437
产权排序3
文献子类Article
英文摘要Revegetation serves as a critical strategy for desertification reversal and ecosystem restoration in global drylands, which facilitates the development of biological soil crusts (biocrusts) thereby significantly influencing C accumulation and persistence in biocrusts and subsoils. However, the quantitative aspects of SOC accrual and its stabilization mechanisms during biocrust development process following revegetation remain poorly understood. In this study, we investigated the temporal evolution of particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) fractions in biocrusts and the underlying soil layers (0-2 and 2-5 cm) along a 68-year revegetation chronosequence in the Tengger Desert. We aimed to elucidate the mechanisms governing the accumulation and stabilization of SOC in biocrust profiles in these fragile ecosystems by analyzing the relationships between SOC fractions and biotic and abiotic factors. Results revealed substantial SOC accumulation across all layers, with biocrusts showing a 91.77-fold increase over the study period compared with the 38.33- and 7.07-fold increases in the 0-2 and 2-5 cm layers, respectively. MAOC concentrations increased significantly from 1.14 to 5.65 g kg(-1) in biocrusts, 0.001 to 1.49 g kg(-1) in 0-2 cm soil, and 0.002 to 0.33 g kg(-1) in 2-5 cm soil. Consequently, the MAOC proportion of total SOC ranged from 19.89 %-37.36 % in biocrusts, 1.46 %-41.99 % in 0-2 cm soil, and 1.59 %-30.96 % in 2-5 cm soil after 68 years. Although POC concentrations also increased, its proportions decreased significantly, and they remained dominant (>58 % of the total SOC) across all layers throughout the chronosequence. Biocrusts accounted for 45.10-70.02 % of the total SOC and 48.11-71.52 % of MAOC stocks in the profile, establishing their pivotal role in SOC accumulation and stabilization in rehabilitated dryland ecosystems. Estimated maximum MAOC concentrations (6.94, 2.55, and 0.96 g kg(-1) for the three layers, respectively) and their corresponding proportions (43.50 %, 46.32 %, and 40.05 %) remained substantially below theoretical saturation thresholds, indicating considerable residual sequestration and stabilization potential. Mechanistic analysis showed that revegetation drives SOC accrual and stabilization in biocrust profile through modulating plant-biocrust inputs, soil physicochemical properties, microbial community composition, C-degrading enzyme activities, and MBC. These findings provide crucial insights in C cycling in biocrusts associated with revegetation in arid ecosystems, emphasizing the importance of biocrust development and conservation for long-term SOC sequestration and persistence.
URL标识查看原文
WOS关键词BIOLOGICAL SOIL CRUSTS ; COLORADO PLATEAU ; MICROBIAL COMMUNITIES ; LITTER DECOMPOSITION ; NITROGEN DEPOSITION ; MATTER ; SAND ; MINERALIZATION ; AFFORESTATION ; FIXATION
WOS研究方向Agriculture
语种英语
WOS记录号WOS:001533358300001
出版者ELSEVIER
源URL[http://ir.igsnrr.ac.cn/handle/311030/215318]  
专题生态系统网络观测与模拟院重点实验室_外文论文
通讯作者Li, Xiaojun
作者单位1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Shapotou Desert Res & Expt Stn, Lanzhou 730000, Peoples R China;
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China;
3.Natl Ecosyst Sci Data Ctr, Beijing 100101, Peoples R China;
4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 101408, Peoples R China
5.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Ecol Safety & Sustainable Dev Arid L, Lanzhou 730000, Peoples R China;
推荐引用方式
GB/T 7714		 Li, Xiaojun,Guo, Qun,Jia, Rongliang,et al. Revegetation drives the accrual and stabilization of organic carbon in biocrusts and subsoils in the Tengger Desert, north China[J]. GEODERMA,2025,460:117437.
APA Li, Xiaojun,Guo, Qun,Jia, Rongliang,&Gao, Yanhong.(2025).Revegetation drives the accrual and stabilization of organic carbon in biocrusts and subsoils in the Tengger Desert, north China.GEODERMA,460,117437.
MLA Li, Xiaojun,et al."Revegetation drives the accrual and stabilization of organic carbon in biocrusts and subsoils in the Tengger Desert, north China".GEODERMA 460(2025):117437.

入库方式： OAI收割

来源：地理科学与资源研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。