title: Accessing the impacts of bamboo expansion on NPP and N cycling in evergreen broadleaved forest in subtropical China.
abstract: Bamboo (Phyllostachys pubescens) expansion into adjacent forests is a widespread phenomenon in subtropical regions, and it has greatly changed the dominance hierarchy from trees to bamboos. This process may be accompanied by changes in productivity, nutrients accumulation and biogeochemical cycles. We compared the net primary production (NPP) and major pools and fluxes of nitrogen (N) in bamboo-dominant forest (BDF) and neighboring secondary evergreen broadleaved forest (EBF) in South China using the space-for-time substitution method. We found that the mean NPP of the BDF was 30.0 t ha-1yr-1, which was 51.5% greater than that of the EBF (19.8 t ha-1yr-1). The plant N pool for the BDF was 37.5% larger than that of the EBF, whereas the soil inorganic N pool significantly decreased by 31.2% with conversion of the EBF to BDF. Additionally, the ratio of N return to N uptake was 0.69 in the BDF and 0.88 in the EBF because of the lower litter N return of the BDF compared with that of the EBF. These results indicated that the expansion of P. pubescens significantly increased the NPP and plant N accumulation but reduced the soil N available pool and slowed the N cycling rate, which could lead to soil degradation.
authors.affiliation: Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing 100084, China.
authors.forename: Qing-Ni
authors.initials: QN
authors.lastname: Song
authors.affiliation: Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing 100084, China.|The Joint Center for Global Change Studies, Beijing 100875, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Lu
authors.affiliation: Stable Isotope Center, College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.affiliation: Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing 100084, China.|The Joint Center for Global Change Studies, Beijing 100875, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.affiliation: Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University, Nanchang 330045, China.
authors.forename: Guang-Yao
authors.initials: GY
authors.lastname: Yang
authors.affiliation: Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University, Nanchang 330045, China.
authors.forename: Qing-Pei
authors.initials: QP
authors.lastname: Yang
mesh_terms: D018533:Biomass; D017753:Ecosystem; D065928:Forests; D009584:Nitrogen / Q000378:metabolism; D058458:Nitrogen Cycle; D006109:Poaceae / Q000254:growth & development*; D014197:Trees / Q000378:metabolism*; D014329:Tropical Climate
chemical_list: D009584:Nitrogen