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Response of Soil Microbial Biomass and Nutrient to Simulated Warming and Nitrogen Application in Songnen Grassland

Author: YangJianQin
Tutor: GuoJiXun
School: Northeast Normal University
Course: Ecology
Keywords: Soil microbial biomass Soil nutrient Warming Nitrogen Songnen grassland
CLC: S812.2
Type: Master's thesis
Year: 2011
Downloads: 114
Quote: 0
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Abstract


Soil in the formation and evolution of soil fertility plays an important role. This experiment simulated global warming and nitrogen deposition explored Northeast chinensis meadow in Songnen grassland soil microbial biomass and nutrients (organic carbon, nitrogen, etc.) trends. The results show that warming, nitrogen and warming the soil microbial biomass carbon nitrogen treatments (SMBC), microbial biomass nitrogen (SMBN) and soil nutrients have shown some trends. Microbial biomass changes are: Compared with the control, N treatments make microbial biomass carbon and nitrogen were increased by 22.6% and 36.8%; warming treatments, both in May decreased in August and October, but there is an increasing trend; warming on soil microbial biomass N treatments had no significant impact rule. Control and nitrogen treatments, both of which changes with the seasons of the overall trend is consistent, that is, first decreased and then increased, in May were higher than other sampling period; warming and warming nitrogen in soil microbial biomass carbon has been under treatment slow decline, soil microbial biomass nitrogen is first increased and then decreased. The two-factor univariate analysis of variance, the interaction between treatment and time on soil microbial biomass carbon and nitrogen were highly significant effect (P lt; 0.01). And among treatments SMBC / SMBN significantly different values, which were treated SMBC / SMBN highest value, indicating warming, warming nitrogen and nitrogen treatments on soil microbial community structure have a significant effect (P lt; 0.05). Changes in soil nutrients as: different treatments of soil organic carbon content was nitrogen gt; warming nitrogen gt; controlled gt; warming law, the differences among the treatments significantly in May, other months is not significant, which warming decrease of 5.5% of the organic carbon, nitrogen so an increase of 21.6% And the differences between each month is not significant. Compared with the control, total nitrogen content of the soil warming treatment decreased 9%; nitrogen fertilization of the soil total nitrogen, available nitrogen and nitrogen mineralization rates were increased by 20.4%, 33%, 17.4%; warming nitrogen treatments nitrogen content of soil nitrogen mineralization rate also increased, but not significantly. Different soil total nitrogen, available nitrogen and nitrogen mineralization rate change with time trends are gradually increased from the beginning of May, August Max, and 5,8, and 10 months were significantly different (P lt; 0.01 ). Between different treatments and seasons significant interaction (P lt; 0.05, except for available nitrogen). The correlation analysis showed that microbial biomass carbon, nitrogen and soil organic carbon, total nitrogen, available nitrogen are positively correlated, and microbial biomass carbon and microbial biomass nitrogen correlation was highly significant (P lt; 0.01). Confirmed the microbial biomass carbon and nitrogen can characterize soil fertility is a sensitive factor.

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