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Ecological Mechanism Of Kin Selection In Plants: A Test On Assumption Of Rhizospheric N Mineralization

Posted on:2018-08-08Degree:MasterType:Thesis
Country:ChinaCandidate:B ZhongFull Text:PDF
GTID:2310330536488698Subject:Breeding professional
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In recent years,ecologists have discovered the most important ways of the same kind of plants grow together.When some plant grows with the kin plant,the competition and interference of the underground resources were reduced,at the same time,the overall fitness increased.In recent years,the majority of studies have predicted that kin selection is due to the complex causes of rhizosphere environment affected by root exudates.However,there is lack of the research on how does the kin selection reduce interference and competition and increase the overall fitness of the kin plants grow nearly.Under our existing research,we choose the Lolium multiflorum L.?kin selection plant?and Zea mays?non-kin selection plant?as the experimental materials,contrastive study plant biomass?aboveground biomass,underground biomass?,rate of root exudates?soluble carbon and nitrogen?,rhizosphere soil microbial biomass?C,N?,soil enzyme activity?b-glucosidase,N-acetyl beta-D amino glucosidase,urease,acid phosphatase?and soil soluble nitrogen?ammonium nitrogen,nitrate nitrogen,soluble organic nitrogen,soluble total nitrogen?of Lolium multiflorum L.and Zea mays grow with same kin or non-kin plant.And at the same time,the root exudates were collected by leaching method.According to the proportion of rhizosphere soil,root system and leach time determine the amount of soil culture and the amount of root solution,contrastive study cultured soil microbial biomass?C,N?,soil enzyme activity?b-glucosidase,N-acetyl beta-D amino glucosidase,urease,acid phosphatase?and soil soluble nitrogen?ammonium nitrogen,nitrate nitrogen,soluble organic nitrogen,soluble total nitrogen?to explore more deeply the intrinsic ecological mechanism of plant kin selection.The results show that:?1?There was no significant difference in the total biomass in kin plant group or non-kin plant of Lolium multiflorum L.?P>0.05?.Compared with the adjacent growth of the non-kin plant group,the kin plant group significantly reduced the underground biomass?2.89±0.09 g?,at the same time rhizosphere soil microbial biomass carbon(102.03±4.02 mg C kg-1),microbial biomass nitrogen(41.95±2.31 mg N kg-1),MBC: MBN?2.46±0.08?,root exposure soluble organic Carbon to Nitrogen ratio?2.44 ±0.09?have significant increased.The soluble organic carbon to nitrogen ratio was significantly correlated with microbial biomass carbon and nitrogen in the correlation study?P<0.05?.?2?The root solution of kin Lolium multiflorum L.plant group increased soil microbial biomass carbon(51.33±2.68 mg C kg-1),microbial biomass nitrogen(9.56±0.31 mg N kg-1),ammonium nitrogen(15.97±0.48 mg kg-1),soluble total nitrogen(31.34±1.66 mg kg-1),N-acetyl beta-D amino glucosidase(201.33±12.42 mg kg-1 h-1),urease(165.77±3.61 mg kg-1 h-1).In the correlation study,the root solution treated soil microbial biomass carbon and nitrogen were significantly or extremely significantly correlated with ammonium nitrogen,soluble total nitrogen and urease,urease was significantly or extremely significantly correlated with N-acetyl beta-D amino glucosidase,ammonium nitrogen and total soluble nitrogen,N-acetyl beta-D amino glucosidase was significantly or extremely significantly correlated with nitrate nitrogen,soluble organic nitrogen and soluble total nitrogen.?3?Soil microbial biomass carbon and nitrogen,soil enzyme activity and soluble nitrogen affected by kin or non-kin Zea mays grow groups or the root solution does not have some significant difference.Results show there were significant differences in root exudates,rhizosphere soil microbial biomass,soil enzyme activities,nitrogen sources between kin plant group and non-kin plant group.So we think that kin selection regulate rhizosphere microbial biomass and soil enzyme activity by the changes of root exudates,and accelerate rhizosphere nitrogen mineralization and reduce nitrogen competition and realize the kin selection finally.
Keywords/Search Tags:Lolium multiflorum L, root exudates, microbial biomass carbon and nitrogen, soil enzyme, soluble nitrogen
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