N-P Fertilization Inhibits Growth of Root Hemiparasite Pedicularis kansuensis in Natural Grassland
Liu, Yanyan1,2; Taxipulati, Teyibai2; Gong, Yanming1; Sui, Xiaolin3; Wang, Xuezhao3,4; Parent, Serge-Etienne5; Hu, Yukun1; Guan, Kaiyun1; Li, Airong3
2017-12-07
发表期刊FRONTIERS IN PLANT SCIENCE
ISSN1664-462X
卷号8页码:2088
摘要Fertilization has been shown to affect interactions between root hemiparasitic plants and their host plants, alleviating damage to the hosts by parasitism. However, as a majority of studies were conducted in pot cultivation, the influence of fertilizer application on root hemiparasites and the surrounding plant community in field conditions as well as relevant mechanisms remain unclear. We manipulated soil nutrient resources in a sem-iarid subalpine grassland in the Tianshan Mountains, northwestern China, to explore the links between fertilization and plant community composition, productivity, survival, and growth of a weedy root hemiparasite (Pedicularis kansuensis). Nitrogen (at a low rate, LN, 30 kg N ha(-1) year(-1) as urea; or at a high rate, HN, 90 kg N ha(-1) year(-1) as urea) and phosphorus [100 kg ha(-1) year(-1) as Ca(H2PO4)(2)center dot H2O] were added during two growing seasons. Patterns of foliar nutrient balances were described with isometric log ratios for the different plant functional groups receiving these fertilization regimes. Fertilization with LN, HN, and P reduced above-ground biomass of P. kansuensis, with above-ground biomass in the fertilization treatments, respectively, 12, 1, and 39% of the value found in the unfertilized control. Up to three times more above-ground biomass was produced in graminoids receiving fertilizers, whereas forb above-ground biomass was virtually unchanged by the fertilization regimes and forb species richness was reduced by 52% in the HN treatment. Fertilization altered foliar nutrient balances, and distinct patterns emerged for each plant functional group. Foliar [C vertical bar P, N] balance in the plant community was negatively correlated with above-ground biomass (P = 0.03). The inhibited competitiveness of P. kansuensis, which showed a much higher [C vertical bar P, N] balance, could be attributed to reduced C assimilation rather than mineral nutrient acquisition, as shown by significant increase in foliar N and P concentrations but little increase in C concentration following fertilization.
关键词Fertilization Grassland Root Hemiparasite Plant Functional Groups Foliar Nutrient Balance
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/60483
专题植物化学与西部植物资源持续利用国家重点实验室
作者单位1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Key Lab Biogeog & Bioresource Arid Land, Urumqi, Peoples R China
2.Xinjiang Univ, Coll Resources & Environm Sci, Urumqi, Peoples R China
3.Chinese Acad Sci, Kunming Inst Bot, Dept Econ Plants & Biotechnol, Yunnan Key Lab Wild Plant Resources, Kunming, Yunnan, Peoples R China
4.Northwest Agr & Forestry Univ, Coll Anim Sci & Technol, Xianyang, Peoples R China
5.Univ Laval, Dept Soils & Agrifood Engn, Quebec City, PQ, Canada
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Liu, Yanyan,Taxipulati, Teyibai,Gong, Yanming,et al. N-P Fertilization Inhibits Growth of Root Hemiparasite Pedicularis kansuensis in Natural Grassland[J]. FRONTIERS IN PLANT SCIENCE,2017,8:2088.
APA Liu, Yanyan.,Taxipulati, Teyibai.,Gong, Yanming.,Sui, Xiaolin.,Wang, Xuezhao.,...&Li, Airong.(2017).N-P Fertilization Inhibits Growth of Root Hemiparasite Pedicularis kansuensis in Natural Grassland.FRONTIERS IN PLANT SCIENCE,8,2088.
MLA Liu, Yanyan,et al."N-P Fertilization Inhibits Growth of Root Hemiparasite Pedicularis kansuensis in Natural Grassland".FRONTIERS IN PLANT SCIENCE 8(2017):2088.
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