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Nitrogen functional gene activity in soil profiles under progressive vegetative recovery after abandonment of agriculture at the Puding Karst Critical Zone Observatory, SW China
Li, Dandan1; Zhang, Xinyu1,2; Green, Sophie M.3; Dungait, Jennifer A. J.3,4; Wen, Xuefa1,2; Tang, Yuqian1,2; Guo, Zhiming1,2; Yang, Yang1,2; Sun, Xiaomin1,2; Quine, Timothy A.3
2018-10-01
Source PublicationSOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
Volume125Pages:93-102
Corresponding AuthorZhang, Xinyu(zhangxy@igsnrr.ac.cn)
AbstractAt the end of the 20th century, China launched the 'Grain-for-Green' Project (GGP) that recommended the abandonment of low-yielding sloping farmland (> 15 degrees) prone to soil degradation by erosion, to allow recovery through natural vegetative regeneration. The effect of this policy on soil nitrogen (N) cycling, as fertilization applications are also withdrawn after abandonment, is poorly understood. A space-for-time approach was applied to investigate the responses of nitrogen functional genes (NFGs) in soil profiles (surface to bedrock) associated with progressive vegetative recovery (sloping farmland > recently abandoned sloping farmland > secondary forest > primary forest) at the Puding Karst Critical Zone Observatory in Guizhou province, southwest China. Coincident soil chemical properties (dissolved organic carbon (DOC), nitrate (NO3-N), ammonium (NH4+-N), available inorganic phosphorus (AP), soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP)) were also quantified. We found that the absolute abundance of NFGs significantly varied according to the phase of vegetation recovery, and that concentrations of AP and NO3%N were the best explanatory variables. The external N from fertilizer application promoted the absolute abundances of ammonia oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in sloping farmland. The relative abundances of chiA (associated with decomposition) increased with soil depth across all vegetation recovery phases. The relative abundances of chiA and nifH (associated with N fixation) accounted for the largest proportion (58-72%) of the measured NFGs, indicating that active N-acquisition increased along the vegetation recovery gradient. The ratios of (chiA + nifH)/(AOA + AOB) and the sums of (nirK + nirS) were larger in the forest soil than those of sloping farmland and abandoned sloping farmland, implying a greater capacity for N storage potential, though accompanied by increased gas N emission potential, in the karst forest ecosystems. Our results provide a new and comprehensive understanding of soil N cycling potentials at the microscale in degraded and recovering karst ecosystems.
KeywordNitrogen functional genes Soil profile Vegetation recovery Karst ecosystems Nitrate Phosphorus
DOI10.1016/j.soilbio.2018.07.004
WOS KeywordORGANIC-CARBON ; COMMUNITY STRUCTURE ; SOUTHWEST CHINA ; DENITRIFYING BACTERIA ; MICROBIAL COMMUNITIES ; FOREST ECOSYSTEMS ; AMMONIA OXIDIZERS ; LAND-USE ; ABUNDANCE ; DENITRIFICATION
Indexed BySCI
Language英语
Funding ProjectState Key and General Programs of National Natural Science Foundation of China[41571130043] ; State Key and General Programs of National Natural Science Foundation of China[41571251] ; National Environmental Research Council of the UK[NE/N007603/1]
Funding OrganizationState Key and General Programs of National Natural Science Foundation of China ; National Environmental Research Council of the UK
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000444660400010
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/52904
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Xinyu
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
3.Univ Exeter, Coll Life & Environm Sci, Geog, Rennes Dr, Exeter EX4 4RJ, Devon, England
4.Rothamsted Res, Sustainable Agr Syst Dept, Okehampton EX20 2SB, Devon, England
Recommended Citation
GB/T 7714
Li, Dandan,Zhang, Xinyu,Green, Sophie M.,et al. Nitrogen functional gene activity in soil profiles under progressive vegetative recovery after abandonment of agriculture at the Puding Karst Critical Zone Observatory, SW China[J]. SOIL BIOLOGY & BIOCHEMISTRY,2018,125:93-102.
APA Li, Dandan.,Zhang, Xinyu.,Green, Sophie M..,Dungait, Jennifer A. J..,Wen, Xuefa.,...&Quine, Timothy A..(2018).Nitrogen functional gene activity in soil profiles under progressive vegetative recovery after abandonment of agriculture at the Puding Karst Critical Zone Observatory, SW China.SOIL BIOLOGY & BIOCHEMISTRY,125,93-102.
MLA Li, Dandan,et al."Nitrogen functional gene activity in soil profiles under progressive vegetative recovery after abandonment of agriculture at the Puding Karst Critical Zone Observatory, SW China".SOIL BIOLOGY & BIOCHEMISTRY 125(2018):93-102.
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