Responses of Plant and Soil C:N:P Stoichiometry to Fertilization inLeymus chinensis Mowing Meadow
The experiment was conducted to study the effects of plant community productivity, plant community and soil C:N:P ecological characteristics of chemometrics In hulunbuir Leymus Chinensis Mowing Meadow, by using different kinds of fertilization and different fertilizer treatment, in order to select the optimal combination of the grassland types and fertilizer rate for this region. Our objective was to explore the influence of nitrogen (N) and phosphorus (P) fertilizer levels on carbon C:N:P stoichiometry of plant community and soil with Leymus Chinensis Mowing Meadow. Our results showed that adding the concentration fertilizer reduced community biomass on the ground was on the rise in 2014 and H3 (N 10.5 g·m-2+P 5.1 g·m-2) has the highest biomass (505.8 g·m-2), but community biomass on the ground climbed up and then declined in 2015 and H2 (N 7.0 g·m-2+P 3.4 g·m-2) was the highest biomass (264 g·m-2). The total carbon, total nitrogen and total phosphorus of plant community had no marked change in 2014. It is opposite change tendency that C: P and N: P; Other indexes were not significant difference besides total N of H2 and H3, total P of H1 in 2014.In 2014, the change range of three layers of soil C:N and C, P and N:P is in fluenced by fertilization concentrations are relatively small, is respectively 18.31~19.42, 64.06~102.51 and 3.38~5.19. The change of the contrast ratio of 2 years, C:P and N:P in 2015 had decline about is 47.8%~59.7% and 15.0%~35.8%. It indicates that nitrogen element may be a major factor of limiting plant growth and phosphorus element can make the nutrient ratio in a relatively balanced state by the view of plant community and soil stoichiometric ratio in this region. The short-term fertilization for the region to ease restrictions on the nitrogen and phosphorus element, but too much nitrogen element added could lead to a change in limiting factor.
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