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Main controls on the denitrification rates during cropland revegetation in the southwest China Karst Critical Zone Observatory
Li, Dandan1,3; Zhang, Xinyu1,4; Dungait, Jennifer A. J.2; Green, Sophie M.2; Wen, Xuefa1,4; Quine, Timothy A.2; Wang, Qiubing3
2021-03-01
Source PublicationAGRICULTURE ECOSYSTEMS & ENVIRONMENT
ISSN0167-8809
Volume308Pages:9
Corresponding AuthorZhang, Xinyu(zhangxy@igsnrr.ac.cn)
AbstractThe revegetation of karst ecosystems in subtropical southwest China that became severely degraded because of intensive agriculture relies on the persistence and recovery of soil functions such as nutrient cycling. Denitrification is a nitrogen (N) removal process that is carried out by nitrifying and denitrifying microorganisms. We still do not have a comprehensive understanding of denitrification and what drives it during revegetation of cropland in degraded karst ecosystems. We used the space-for-time chmnosequence method to establish a restoration gradient (sloping cropland, abandoned sloping cropland, and secondary and primary forest) within the Karst Critical Zone Observatory in southwest China. We quantified the abundances of the nitrifier and denitrifier microbial communities and measured the potential denitrification rates (PDR) and basal denitrification rates (BDR) in incubated soils to investigate the denitrification activity in soils at different stages of restoration. The PDR increased through the cropland revegetation phases, and the BDR was lowest in the abandoned sloping cropland (p < 0.05). Both the PDR and BDR were positively correlated with the denitrifier abundances (i.e., nitrite reductase, nirK, and nirS), but were negatively correlated with nitrifier abundances (i.e., ammonia oxidation, AOA, and AOB). The BDR/PDR ratio was 84 % in the sloping cropland but was only 1% in the primary forest, which suggests that the N cycling was inefficient ('leaky') in actively managed farmland soils but was 'tight' in forest soils. The AOB and nirS abundances explained most of the PDR in the sloping cropland and abandoned sloping cropland, while the soil phosphorus (P) contents explained most of the variation in BDR and PDR in land that was forested in later phases of revegetation. Progressive increases in the PDR as the revegetation progressed was directly controlled by the soil available P and total P contents. Available P was also associated with increases in the carbon (C) and N contents, which influenced the BDR indirectly through increased abundances of nirK and nirS. We conclude that revegetation of cropland helped to facilitate 'tight' N-cycling in poor karst soils, and we suggest that judicious P fertilization on sloping cropland would reduce the denitrification activity in degraded ecosystems.
KeywordKarst Critical Zone Observatory Cropland revegetation Nitrifier and denitrifier abundances Potential denitrification rates Basal denitrification rates Phosphorus
DOI10.1016/j.agee.2020.107228
WOS KeywordNITROUS-OXIDE EMISSIONS ; POTENTIAL DENITRIFICATION ; N2O EMISSIONS ; VEGETATION RECOVERY ; CARBON STOCK ; LAND-USES ; ABUNDANCE ; FOREST ; GENES ; SUCCESSION
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFC0500102] ; Science Centre Project of National Natural Science Foundation of China[31988102] ; National Natural Science Foundation of China[41877091] ; National Natural Science Foundation of China[41830860] ; National Natural Science Foundation of China[41571130043] ; National Environmental Research Council of the UK[NE/N007603/1]
Funding OrganizationNational Key Research and Development Program of China ; Science Centre Project of National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Environmental Research Council of the UK
WOS Research AreaAgriculture ; Environmental Sciences & Ecology
WOS SubjectAgriculture, Multidisciplinary ; Ecology ; Environmental Sciences
WOS IDWOS:000604619500002
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/136806
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 Exeter, Coll Life & Environm Sci, Dept Geog, Exeter EX4 4RJ, Devon, England
3.Shenyang Agr Univ, Coll Land & Environm, Shenyang 110866, Peoples R China
4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Li, Dandan,Zhang, Xinyu,Dungait, Jennifer A. J.,et al. Main controls on the denitrification rates during cropland revegetation in the southwest China Karst Critical Zone Observatory[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2021,308:9.
APA Li, Dandan.,Zhang, Xinyu.,Dungait, Jennifer A. J..,Green, Sophie M..,Wen, Xuefa.,...&Wang, Qiubing.(2021).Main controls on the denitrification rates during cropland revegetation in the southwest China Karst Critical Zone Observatory.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,308,9.
MLA Li, Dandan,et al."Main controls on the denitrification rates during cropland revegetation in the southwest China Karst Critical Zone Observatory".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 308(2021):9.
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