IAE OpenIR  > 沈阳应用生态研究所
Divergent composition and turnover of soil organic nitrogen along a climate gradient in arid and semiarid grasslands
Feng, Jiao1,2; Turne, Benjamin L.3; Wei, Kai1; Tian, Jihui1; Chen, Zhenhua1; Lu, Xiaotao1; Wang, Chao1; Chen, Lijun1
2018-10-01
Source PublicationGEODERMA
ISSN0016-7061
Volume327Pages:36-44
AbstractGreater aridity predicted with climate change in drylands worldwide will affect soil nitrogen (N) cycling and the associated ecosystem functions. Despite > 90% of soil N occurring in organic forms, the pathways of soil organic N (SON) turnover remain largely unknown in drylands, where biological activity is typically limited by water availability. Here we examined patterns of SON fractions and soil N-hydrolyzing enzyme activities across a 3700 km aridity gradient in arid and semiarid grasslands of northern China. We found that both the concentrations of all SON fractions and the proportion of more stable SON increased with increasing aridity index (AI, defined as mean annual precipitation/potential evapotranspiration). The largest SON fraction was hydrolysable NH4+ in arid sites, but amino acid-N in semiarid sites. The activities of enzymes that hydrolyze relatively stable SON polymers (protease, peptidase, and N-acetyl-beta-glucosaminidase) were negligible in arid sites (AI < 0.2), but increased significantly as Al increased in semiarid sites (AI > 0.2). Structural equation modeling indicated that the direct effect of microbial biomass on soil amidase was insignificant in arid sites, indicating that microbial SON turnover via enzymes is relatively weak. In semiarid sites, however, microbial biomass exerted significant direct positive effects on all soil N-hydrolyzing enzymes, suggesting strong microbial regulation of SON turnover via enzymatic mineralization. Altogether, our findings provide empirical evidence for divergent patterns of storage and turnover of SON between arid and semiarid grasslands.
KeywordAridity Gradient Drylands Global Climate Change Organic Nitrogen Fractions Nitrogen-hydrolyzing Enzymes Nitrogen Cycling
DOI10.1016/j.geoderma.2018.04.020
Indexed BySCI
Language英语
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000435060200004
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://210.72.129.5/handle/321005/106591
Collection沈阳应用生态研究所
Corresponding AuthorChen, Lijun
Affiliation1.Chinese Acad Sci, Inst Appl Ecol, POB 417, Shenyang 110016, Liaoning, Peoples R China
2.Chinese Acad Sci, Wuhan Bot Garden, Wuhan 430074, Hubei, Peoples R China
3.Smithsonian Trop Res Inst, Apartado 0843-03092, Balboa, Ancon, Panama
Recommended Citation
GB/T 7714
Feng, Jiao,Turne, Benjamin L.,Wei, Kai,et al. Divergent composition and turnover of soil organic nitrogen along a climate gradient in arid and semiarid grasslands[J]. GEODERMA,2018,327:36-44.
APA Feng, Jiao.,Turne, Benjamin L..,Wei, Kai.,Tian, Jihui.,Chen, Zhenhua.,...&Chen, Lijun.(2018).Divergent composition and turnover of soil organic nitrogen along a climate gradient in arid and semiarid grasslands.GEODERMA,327,36-44.
MLA Feng, Jiao,et al."Divergent composition and turnover of soil organic nitrogen along a climate gradient in arid and semiarid grasslands".GEODERMA 327(2018):36-44.
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