首页|Anthropogenic and climatic shaping of soil nitrogen properties across urban-rural-natural forests in the Beijing metropolitan region

Anthropogenic and climatic shaping of soil nitrogen properties across urban-rural-natural forests in the Beijing metropolitan region

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  • NSTL
  • Elsevier
Global urbanization has profoundly altered regional biogeochemical cycles across urban-rural-natural continuums. A better insight in the changes in soil nitrogen (N) properties across urban-rural-natural forests sheds lights on the impacts of urbanization on regional N cycles and ecological consequences. Based on a systematic survey in forest patches of twenty parks across the urban-rural-natural gradients in the Beijing metropolitan region, China, we analyzed the spatial variations of three soil N properties (i.e., total N, alkali-hydrolyzable N, and delta N-15) and their potential drivers that are indicative for anthropogenic N sources (trunk road density for traffic N emissions; cropland share for agricultural N emissions), climate conditions (mean annual temperature, MAT; mean annual precipitation, MAP), forest conditions (forest coverage and the number of common tree species) and time for soil N accumulation since park establishment (park age). Soil total N concentration, alkali-hydrolyzable N concentration and delta N-15 values in the surface (0-10 cm) and subsurface layers (10-20 cm) all showed a decrease up to 40 km (i.e., the urban fertile island phenomenon) from the urban core and then an increase to values in pen-urban natural forests as high as those in urban forests. The spatial variations of the surface and subsurface soil total N concentrations and alkali-hydrolyzable N concentrations were, respectively, mainly and exclusively explained by park age, while trunk mad density, MAP and MAT played a less important role in regulating the soil N variation in the surface layer. The spatial variations of the surface and subsurface soil delta N-15 values were respectively, mainly, and exclusively controlled by cropland share, while park age and MAP played a limited role in regulating the soil delta N-15 variation in the surface layer but not in the subsurface layer. Our findings reveal the way in which anthropogenic and climatic drivers shape soil N properties across the urbanrural-natural forests.

Total nitrogenHydrolysable nitrogenNitrogen isotopeSoilUrban forest

Du, Enzai、Xia, Nan、Tang, Yang、Guo, Zhaodi、Guo, Yuying、Wang, Yang、de Vries, Wim

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Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China

Beijing Normal Univ, Fac Geog Sci, Sch Nat Resources, Beijing 100875, Peoples R China

China Meteorol Adm, Natl Satellite Meteorol Ctr, Beijing 100081, Peoples R China

Wageningen Univ & Res, Environm Res, POB 47, NL-6700 AA Wageningen, Netherlands

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2022

10.1016/j.geoderma.2021.115524

Geoderma: An International Journal of Soil Science

Geoderma: An International Journal of Soil Science

ISSN：0016-7061
年,卷(期)：2022.406
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