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The Effects Of The Canadian One Branch Of Yellow Flower On The Soil Ecosystem Under The Condition Of Increasing Temperature And Nitrogen Deposition

Posted on:2017-12-08Degree:MasterType:Thesis
Country:ChinaCandidate:J LiuFull Text:PDF
GTID:2310330488963567Subject:Physical geography
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The temperature has a significant impact on the geochemical process in the terrestrial ecosystem and the nitrogen deposition can cause great changes of the terrestrial ecosystem.The exotic plant invasino may cause grave damage to ecosystem,including soil nutrients, soil moisture, community structure and dynamic change.The influence of exotic plant invasino is complex and it will change with the climate.Now,People have been done much research work on the influence of global warming, nitrogen deposition,plant invasion,etc. on the ecosystem, however, the research on the underground ecology is not perfect enough. This paper reveals the response of soil ecosystem to different influencing factors though simulating the influence of the climate warming, nitrogen deposition, and plant invasion on the underground ecology. we have collected numerous samples and made laboratory analysis over the two years of 2014-2015, at the same time, we have done the test and studies on soil water content, soil PH value, soil nutrient, soil enzyme activity and the identification on the number and species of oil microorganism. We use the software SPSS 22.0 to make variance and regression analysis on the experimental data we got,and the results are as follows:(1)The average value of soil moisture is 12.77% under the condition of no heating, while greater than heating conditions is 11.62%. The PH value of soil from2014 to 2015 shows that the soil PH improved remarkably changing from weak acidic to weak alkaline.(2)We analyzed the influence caused under different processes on the organic matter content in soil, and the result shows that temperature enhancement has an obvious effect on the organic matter content of soil(P<0.05).The interaction effect of temperature enhancement and nitrogen deposition also has an obvious influence on the organic matter content of soil(P<0.05). Temperature enhancement significantly inhibits the soil organic matter content, and the rate of inhibition is 5%.The analysis result of the influence on the total nitrogen content of soil under different processesshows that the interaction effect of temperature enhancement and nitrogen deposition has an extremely significant impact on the organic matter content of soil(P<0.01),and it encourages the organic matter content of soil. The analysis result of the influence on the available phosphorus contentof soil under different processes shows that nitrogen deposition remarkably increases the available phosphorus content of soil by3.17%(P<0.05). The analysis result of the influence on the available potassium content of soil under different processes shows that nitrogen deposition remarkably increases the available potassium content of soil(P<0.05).(3)The comparison of soil microbial quantity under different processes shows that temperature enhancement remarkably inhibits the number of bacteria in soil(P<0.01)as a rate of 63%,and nitrogen deposition also inhibits the number of bacteria in soil(P<0.01) as a rate of 61%.Temperature enhancement remarkably promotes the number of fungi in soil which is 88% higher than process with no temperature enhancement. Temperature enhancement remarkably increases the number of actinomycetes(P<0.05) by 39%. The interaction effect of temperature enhancement and nitrogen deposition has has an extremely significant impact on the number of actinomycetes(P<0.01).We found 11 kinds of bacteria,4 kinds of fungi and 3 kinds of actinomycetes in total through the molecular identification of soil microbial in the experiment region.The quantity analysis of soil microbial in the experiment region shows that bacteria is dominant group, actinomycetes is common group and fungi is rare group.(4)Through the measure of soil enzyme activity, we found that the temperature enhancement remarkably inhibits the content of urease of the soil in the experiment region(P<0.05) and the interaction effect of temperature enhancement and nitrogen deposition has an extremely significant impact on soil urease, sucrase, neutral phosphatase, catalase and activity(P<0.01).The interaction effect of temperature enhancement and nitrogen deposition improves the activity of soil urease by8.6%,while reducing the activity of sucrase by 96% and phosphatase by 32% in soil,and reduce the activity of catalase by 67%.
Keywords/Search Tags:Soil microbial, Soil enzyme, Soil nutrient, Climate warming, Nitrogen deposition
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