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Effects of nitrogen addition on plant biomass and tissue elemental content in different degradation stages of temperate steppe in northern China

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Journal of Plant Ecology 2018年第5期11卷 730-739页

作者： Jin-Bin Chen Cheng-Cheng Dong Xiao-Dong Yao Wei Wang Department of Ecology College of Urban and Environmental Sciences and Key Laboratory for Earth Surface ProcessesPeking UniversityNo.5 Yiheyuan RoadHaidian DistrictBeijing 100871China School of Urban Planning and Design Peking University Shenzhen Graduate SchoolLishui RoadXili TownNanshan DistrictShenzhen 518055China

Aims Grassland degradation has become a common problem *** studies have analyzed the effects of nitrogen(N)addition on plant growth in grasslands,but few have considered its effects on plant growth in degraded *** aim of this study was to evaluate the effects of N addition on plant growth in grasslands with different levels of degradation in Inner Mongolia,*** A 2-year field experiment was conducted to evaluate plant growth response to N addition in degraded grasslands on the Inner Mongolian *** with four levels of degradation were selected for N-addition treatments(0,10,20,30,40,50 g N m−2 year−1).Important Findings Aboveground biomass was increased by N fertilization in degraded grasslands,and N addition was significantly related to increased biomass in grasslands with severe ***,N fertilization did not significantly affect belowground *** effects of N addition on foliar nutrient concentrations in the same species differed among grasslands with different degradation *** was an inconsistent response to N addition between Sanguisorba officinalis and Vicia sepium in non-degraded *** was a significant positive correlation between foliar N content and aboveground biomass in grasslands with different levels of *** results indicate that the effects of N addition on plant growth in grasslands differ according to the severity of *** conclude that N fertilization may be an effective management technique for degraded grasslands in this area and may improve for-age productivity in the short term.

关键词： nitrogen addition degraded grassland aboveground biomass belowground biomass foliar nitrogen concentrations root nitrogen concentrations

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