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Effect of Large-Scale Cultivated Land Expansion on the Balance of Soil Carbon and Nitrogen in the Tarim Basin
Xu, Erqi1; Zhang, Hongqi1; Xu, Yongmei2
2019-02-01
Source PublicationAGRONOMY-BASEL
ISSN2073-4395
Volume9Issue:2Pages:18
Corresponding AuthorZhang, Hongqi(zhanghq@igsnrr.ac.cn) ; Xu, Yongmei(xym1973@163.com)
AbstractLand reclamation influences the soil carbon and nitrogen cycling, but its scale and time effects on the balance of soil carbon and nitrogen are still uncertain. Taking the Tarim Basin as the study area, the impact of land reclamation on the soil organic carbon (SOC), total nitrogen (TN), and carbon to nitrogen (C:N) ratio was explored by the multiple temporal changes of land use and soil samples. Remote sensing detected that cropland nearly doubled in area from 1978 to 2015. Spatial analysis techniques were used to identify land changes, including the prior land uses and cultivation ages. Using land reclamation history information, a specially designed soil sampling was conducted in 2015 and compared to soil properties in ca. 1978. Results found a decoupling characteristic between the C:N ratio and SOC or TN, indicating that changes in SOC and TN do not correspond directly to changes in the C:N ratio. The land reclamation history coupled with the baseline effect has opposite impacts on the temporal rates of change in SOC, TN and C:N ratios. SOC and TN decreased during the initial stage of conversion to cropland and subsequently recovered with increasing cultivation time. By contrast, the C:N ratio for soils derived from grassland increased at the initial stage but the increase declined when cultivated longer, and the C:N ratio decreased for soils derived from forest and fluctuated with the cultivation time. Lower C:N ratios than the global average and its decreasing trend with increasing reclamation age were found in newly reclaimed croplands from grasslands. Sustainable agricultural management practices are suggested to enhance the accumulation of soil carbon and nitrogen, as well as to increase the C:N ratio to match the nitrogen deposition to a larger carbon sequestration.
Keywordsoil stoichiometry land use change soil organic carbon nitrogen Tarim Basin
DOI10.3390/agronomy9020086
WOS KeywordMICROBIAL BIOMASS CARBON ; HORQIN SANDY LAND ; ORGANIC-CARBON ; CHINA ; SEQUESTRATION ; DYNAMICS ; STOCKS ; TILLAGE ; FOREST ; RATIO
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundations of China[41671097] ; National Natural Science Foundations of China[41601095] ; National Natural Science Foundations of China[41561070]
Funding OrganizationNational Natural Science Foundations of China
WOS Research AreaAgriculture ; Plant Sciences
WOS SubjectAgronomy ; Plant Sciences
WOS IDWOS:000460694200045
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/49226
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Hongqi; Xu, Yongmei
Affiliation1.Chinese Acad Sci, Key Lab Land Surface Pattern & Simulat, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
2.Xinjiang Acad Agr Sci, Inst Soil & Fertilizer, Urumqi 830091, Peoples R China
Recommended Citation
GB/T 7714
Xu, Erqi,Zhang, Hongqi,Xu, Yongmei. Effect of Large-Scale Cultivated Land Expansion on the Balance of Soil Carbon and Nitrogen in the Tarim Basin[J]. AGRONOMY-BASEL,2019,9(2):18.
APA Xu, Erqi,Zhang, Hongqi,&Xu, Yongmei.(2019).Effect of Large-Scale Cultivated Land Expansion on the Balance of Soil Carbon and Nitrogen in the Tarim Basin.AGRONOMY-BASEL,9(2),18.
MLA Xu, Erqi,et al."Effect of Large-Scale Cultivated Land Expansion on the Balance of Soil Carbon and Nitrogen in the Tarim Basin".AGRONOMY-BASEL 9.2(2019):18.
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