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Soil carbon and nitrogen sequestration following the conversion of cropland to alfalfa forage land in northwest China
Su, Yong Zhong
2007
Source PublicationSOIL & TILLAGE RESEARCH
Volume92Issue:1-2Pages:181-189
AbstractSoil C and N contents play a crucial role in sustaining soil quality and environmental quality. The conversion of annually cultivated land to forage grasses has potential to increase C and N sequestration. The objective of this study was to investigate the short-term changes in soil organic C (SOC) and N pools after annual crops were converted to alfalfa (Medicago sativa L. Algonguin) forage for 4 years. Soil from 24 sets of paired sites, alfalfa field versus adjacent cropland, were sampled at depths of 0-5, 5-10 and 10-20 cm. Total soil organic C and N, particulate organic matter (POM) C and N were determined. Organic C, total N, POM-C, and POM-N contents in the 0-5 cm layer were significantly greater in alfalfa field than in adjacent cropland. However, when the entire 0-20 cm layer was considered, there were significant differences in SOC, POM-C and POM-N but not in total N between alfalfa and crop soils. Also, greater differences in POM-C and POM-N were between the two land-use treatments than in SOC and total N were found. Across all sites, SOC and total N in the 0-20 cm profile averaged 22.1 Mg C ha(-1) and 2.3 Mg N ha(-1) for alfalfa soils, and 19.8 Mg C ha(-1) and 2.2 Mg N ha(-1) for adjacent crop soils. Estimated C sequestration rate (0-20 cm) following crops to alfalfa conversions averaged 0.57 Mg C ha(-1) year(-1). Sandy soils have more significant C accumulation than silt loam soils after conversion. The result of this suggests that the soils studied have great C sequestration potential, and the conversion of crops to alfalfa should be widely used to sequester C and improve soil quality in this region. (c) 2006 Elsevier B.V. All rights reserved.
SubtypeArticle
KeywordCarbon Sequestration Nitrogen Sequestration Particulate Organic Matter Land Use Conversion Alfalfa Northwest China
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Subject ExtendedAgriculture
WOS KeywordORGANIC-MATTER ; PARTICULATE ; FRACTIONS ; GRASSLAND ; TILLAGE ; MINERALIZATION ; SASKATCHEWAN ; MANAGEMENT ; DYNAMICS ; TEXTURE
Indexed BySCI
Language英语
WOS SubjectSoil Science
WOS IDWOS:000242007200020
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:49[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/67918
Collection中国科学院地理科学与资源研究所
Corresponding AuthorSu, Yong Zhong
Affiliation1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China
2.Chinese Ecosyst Res Network, Linze Inland River Basin Comprehens Res Stn, Lanzhou 730000, Peoples R China
Recommended Citation
GB/T 7714
Su, Yong Zhong. Soil carbon and nitrogen sequestration following the conversion of cropland to alfalfa forage land in northwest China[J]. SOIL & TILLAGE RESEARCH,2007,92(1-2):181-189.
APA Su, Yong Zhong.(2007).Soil carbon and nitrogen sequestration following the conversion of cropland to alfalfa forage land in northwest China.SOIL & TILLAGE RESEARCH,92(1-2),181-189.
MLA Su, Yong Zhong."Soil carbon and nitrogen sequestration following the conversion of cropland to alfalfa forage land in northwest China".SOIL & TILLAGE RESEARCH 92.1-2(2007):181-189.
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