How does Nitrogen affect interaction between plant and biocrust Pablo and Andrea 2010 nature Microbial Interaction and Nuptake Plant MicrobeInteraction and NDeposition Changes bacterial and fungal community compositionCompton et al 2004 ID: 774240
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How does Nitrogen affect interaction between plant and biocrust .
Pablo and Andrea 2010, nature Microbial Interaction and N-uptake
Plant Microbe-Interaction and N-Deposition Changes bacterial and fungal community composition.(Compton et al., 2004). Microbial biomass and activity (Fisk and Fahey 2001). Lower PH. ( Gue et al.,2010) Affect some species more strongly than others. (Johnson et al., 2008). Leaching of Calcium and Magnesium (Lucas et al., 2011)
Role of Biocrust in Dry Ecosystem Soil erosion. Hydrology. Soil fertility. Enrich the diversity and abundance ( Lalley . 2006). Positive influence on the colonization.(Anderson and Bliss 1998). Alter nutrition concentration ( Langhans et al., 2009). link. Springer.com
Nitrogen Cycle Lumen microbiology
Hypothesis Increasing nitrogen levels has a negative effect on microbial community on dry land ecosystem. N addition will affect biocrust and plant interaction specifically impeding growth parameters and fungal root colonizing.
Field Experiment Nfert: Sevilleta long term Nitrogen Fertilizer Experiment. Twenty 10m x 5m plots were established in December 2005. Fertilizer is applied twice yearly (spring and fall) NH4NO3at the rate of 100kgN/ha/yr. Biocrust collection 20 samples of biocrust (approximately 100g): 10 from fertilized plots and 10 from control plots. Soil nutrients and enzymes.
Experimental Parameters Chlorophyll content Microbial biomass Ergosterol fungal root colonization. Ergosterol
Nitrogen Legacy Control + Nitrogen Current Fertilization Control + Nitrogen Control + Nitrogen Microbe Sterilization Live Sterile Live Sterile Live Sterile Live Sterile Both 10 10 10 10 10 10 10 10 Blue 10 10 10 10 10 10 10 10 Black 10 10 10 10 10 101010 Experimental Design
Greenhouse Experiment . 240 samples from N- fert (12 from each plot). Sterilize sand and Biocrust Seed assorted (blue /black grama ) 12 treatment with 10 replicates. Percentage of seed germination Plant biomass. ( Root, shoot) Soil properties (DOC, NH4+, NO3_) Fungal root colonization. Genotype. Chlorophyll.
Greenhouse Experiment
Analysis Greenhouse experiment used to test the effect of the N fertilizer and biocrust on plant performance i.e., seed germination, chlorophyll estimation, growth and above and belowground biomass. Leachate analysis for DOC< NH4 and NO3. N effects on endophytic root colonization fungus. Examine N-additional effects on microbial biomass. Plant genotype.
Reference Roudger (manuscript), Nitrogen Fertilization Experiment (Nfert): Net Primary Production Quadrate Date at the Sevilleta National Wildlife Refuge, New Mexico (2004-present).Yuanming Zhang,( 2015) Growth response of five desert plants as influenced by biological soil crusts from a temperature desert, China. The Ecological Society of Japan, Dol 10.1007/s 11284-015-1305-z . Cunzheng Wei et al., (2013)Nitrogen deposition weakens plant- microbe's interactions in grassland ecosystem, Global Change Biology 19, 3688-3697, doi:10.1111/ gcb.12348.Emily C. Farrer, Donald J. Herman, Eva Franzova, Trang Pham and Katharine N. Suding (2013),Nitrogen deposition, plant carbon allocation, and soil microbes: Changing interactions due to enrichment, Department of Environmental Science, Policy & Management, University of California, Berkeley, Berkeley California 94720 USA. American Journal of Botany 100(7): 1458-1470. 2013.Caroline A. Havrilla and Nichole N. Barger (2018), Biocrust and their disturbance mediate the recruitment of native and exotic grasses from a hot desert ecosystem, Ecology Evolutionary Biology Department, University of Colorado, Campus Box 334, Boulder, Colorado 80309-0334 USA. Belnap J (2006) The potential roles of biological soil crusts in dryland hydrologic cycles. Hydrol process 20:3159-3178. Schmidt, S. K., Lipson, R.E. Ley, M. C. Fisk. And A.E. West. 2004. Impacts of chronic nitrogen additions vary seasonally and by microbial functional group in tundra soils. Biochemistry 69:1-17.
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