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Response of Plant Community to Simulated Nitrogen Deposition in the Early State of Restoration in Songnen Grassland

Author: WangZuoYong
Tutor: XingFu
School: Northeast Normal University
Course: Ecology
Keywords: Nitrogen deposition Abundance Aboveground productivity Dominant species Plant functional groups Soil physical and chemical indicators
CLC: S812
Type: Master's thesis
Year: 2010
Downloads: 94
Quote: 1
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Abstract


In this paper, after severely degraded grassland enclosed Songnen research object, grassland quantitative characteristics, species diversity and productivity relationship, dominant species and plant functional groups contribute to the productivity and soil physical and chemical indicators such as the response to simulated nitrogen deposition, as Evaluation of nitrogen deposition on grassland ecosystems and grassland use and management to provide a scientific basis. In the early restoration of degraded grassland succession, after 2008 and 2009, two years of field measurements and laboratory analysis, completed Chloris communities and forb communities in two kinds of community type of community level, community density, species diversity, productivity soil physical and chemical indicators such as research work. Using simulated nitrogen deposition of nitrogen is nitrogen content of 46% urea, a total of five concentration process: CK (0); T1 (50 kg/hm2); T2 (100 kg/hm2); T3 (150 kg/hm2 ); T4 (200 kg/hm2). The experimental results showed that: in the early restoration of degraded grassland succession, for Chloris community, simulated nitrogen deposition can significantly increase the height and community density communities; increasing productivity, while reducing species diversity; 2008 species diversity and productivity is positively correlated linear relationship ; Salsola biomass contribution rate decreased, Chloris biomass contribution rate increase; increase of a biennial plant (AB) aboveground productivity; increase soil available nitrogen, reduce soil available potassium. For forb communities, simulated nitrogen deposition can significantly increase the community highly; significant increase in productivity, while significantly reducing species diversity; 2008 species diversity and productivity is negatively correlated linear relationship; Salsola biomass contribution rate increase; 2009 chinensis biomass contribution rate gradually increased; increase of a biennial plant (AB) significantly increased aboveground productivity and perennial rhizomatous grasses (PR) aboveground productivity; soil available nitrogen and soil available phosphorus content increased. Overall, the simulated nitrogen deposition to make restoration of degraded grassland in Songnen Plain early successional species diversity decreased productivity increases, especially a biennial plant productivity increased more obvious; species diversity and productivity due to changes in the correlation between community types and Year vary, soil available nitrogen content increased potassium, available phosphorus variation varies. Different communities in response to simulated nitrogen deposition is different. Simulated nitrogen deposition for the restoration of degraded grassland biomass and early successional species diversity recovery may be advantageous.

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CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > General Animal Science > Grassland Science,prairie school
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