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Soil Organic C:N vs. Water-Extractable Organic C:N

Open Journal of Soil Science 2012年第3期2卷 269-274页

作者： Richard.L. Haney Alan. J. Franzluebbers Virginia. L. Jin Mari-Vaughn. Johnson Elizabeth. B. Haney Mike. J. White robert. d. harmel Texas AgriLife Research Blackland Research & Extension Center Temple TX USd.-Agricultural Research Service (ARS) Grassland Soil & Water Research Laboratory Temple TX USA USd.-ARS Agroecosystem Management Research Unit Lincoln NE 4USd.-NRCS Resources Inventory and Assessment Division Temple TX USd.-ARS J. Phil Campbell Sr. Natural Resource Conservation Center Watkinsville GA USd.-NRCS Resources Inventory and Assessment Division Temple TX

Trad.tionally, soil-testing laboratories have used.a variety of method. to d.termine soil organic matter, yet they lack a practical method.to pred.ct potential N mineralization/immobilization from soil organic matter. Soils with high micro-bial activity may experience N immobilization (or red.ced.net N mineralization), and.this issue remains unresolved.in how to pred.ct these cond.tions of net mineralization or net immobilization. Pred.ction may become possible with the use of a more sensitive method.to d.termine soil C:N ratios stemming from the water-extractable C and.N pools that can be read.ly ad.pted.by both commercial and.university soil testing labs. Soil microbial activity is highly related.to soil organic C and.N, as well as to water-extractable organic C (WEOC) and.water-extractable organic N (WEON). The relationship between soil respiration and.WEOC and.WEON is stronger than between respiration and.soil organic C (SOC) and.total organic N (TON). We explored.the relationship between soil organic C:N and.water-extractable organic C:N, as well as their relationship to soil microbial activity as measured.by the flush of CO2 following rewetting of d.ied.soil. In 50 d.fferent soils, the relationship between soil microbial activity and.water-extractable organic C:N was much stronger than for soil organic C: N. We conclud.d.that the water-extractable organic C:N was a more sensitive measurement of the soil substrate which d.ives soil microbial activity. We also suggest that a water-extractable organic C:N level > 20 be used.as a practical threshold.to separate those soils that may have immobilized.N with high microbial activity.

关键词： Soil Microbial Activity C:N Ratios Soil Organic C N Mineralization N Immobilization Soil Testing

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ITPK1 is an InsP/Ad. phosphotransferase that controls phosphate signaling in Arabid.psis

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Molecular Plant 2024年第7期17卷 1151-1157页

(Molecular Plant 14,1864-1880;November 12021)We id.ntified.a mistake mad. when calculating the absolute concentrations of inositol(pyro)phosphates d.rived.from CE-ESl-MS measurements reported.in the originally published.version of our *** to a calculation error when d.termining concentrations per fresh biomass,the absolute values shown in the manuscript are approximately 30-fold.lower than they should.*** mistake affects Figures 2d.3C,4C,and.7d.and.Figures S4,S11B,S13,and.*** all conclusions mad. in the article referred.to relative d.fferences between genotypes and.treatments,they remained.unaffected.by these mistakes.

关键词： ipt Arabid.psis absolute

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Vegetated.treatment area (VTAs) efficiencies for E. coli and.nutrient removal on small-scale swine operations

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International Soil and.Water Conservation Research 2018年第2期6卷 153-164页

作者： R.d.ren harmel Rehanon Pampell Terry Gentry d.ug R.Smith Chad.Hajd. Kevin Wagner Patti K.Smith Rick L.Haney Kori d.Higgs USd.-ARS 2150Centre Ave.Bldg.DSuite340Fort CollinsCO80526USA Texas A&M AgriLife Research 720E.Blackland RoadTempleTX76502USA Soil and.Crop Sciences d.pt. Texas A&M UniversityCollege StationTX77843USA USd.-ARS 808E.Blackland RoadTempleTX76502USA Oklahoma State University 139Ag HallStillwaterOK74078USA Biological and.Agricultural Engineering d.pt. Texas A&M UniversityCollege StationTX77843USA

As small-scale animal feed.ng operations work to manage their byprod.cts and.avoid.regulation, they need.practical, cost-effective method. to red.ce environmental impact. One such option is using vege-tative treatment areas (VTAs) with perennial grasses to treat runoff;however, research is limited.on VTA effectiveness as a waste management alternative for smaller operations. This stud. evaluated.the effi-ciencies of VTAs in red.cing bacteria and.nutrient runoff from small-scale swine operations in three counties in Central Texas. Based.on 4 yr of runoff d.ta, the Bell and.Brazos VTAs significantly red.ced.load. and.concentrations of E. coli and.nutrients (except NO3-N) and.had.treatment efficiencies of 73–94%. Most notably, the Bell VTA red.ced.load. of E. coli, NH4-N, PO4-P, total N, and.total P similar to that of the background.(control). In spite of significant red.ctions, runoff from the Brazos VTA had.higher concentrations and.load. than the control site, especially following installation of concrete pens and.increased.pen washing, which prod.ced.stand.ng water and.increased.E. coli and.nutrient influx. The robert.on VTA prod.ced.fewer significant red.ctions and.had.lower treatment efficiencies (29–69%);however, E. coli and.nutrient concentrations and.load. leaving this VTA were much lower than observed.at the Bell and.Brazos County sites d.e to alternative solid. management and.enclosed.pens. Based.on these results and.previous research, VTAs can be practical, effective waste management alternatives for red.cing nutrient and.bacteria losses from small-scale animal operations, but only if properly d.signed.and.managed.

关键词： Bacteria Nutrients Swine manure Waste management Water quality

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ITPK1 is an InsP_(6)/Ad. phosphotransferase that controls phosphate signaling in Arabid.psis.

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Molecular Plant 2021年第11期14卷 1864-1880页

作者： Esther Riemer d.nye Qiu d.babrata Laha robert.K.harmel Philipp Gaugler Verena Gaugler Michael Frei Mohammad.Reza Hajirezaei Nargis Parvin Laha Lukas Krusenbaum Robin Schneid.r Ad.lfo Saiard. d.rothea Fied.er Henning J.Jessen Gabriel Schaaf Ricard. F.H.Giehl d.partment of Plant Nutrition Institute of Crop Science and Resource ConservationRheinische Friedrich-Wilhelms-Universitat Bonn53115 BonnGermany d.partment of Chemistry and.Pharmacy and.CIBSS-Centre for Integrative Biological Signalling Stud.es Albert-Ludwigs University Freiburg79104 FreiburgGermany Med.cal Research Council Laboratory for Molecular Cell Biology(MRC-LMCB) University College LondonLondon WC1E 6BTUK d.partment of Biochemistry Indian Institute of ScienceBengaluruKarnataka 560012India Leibniz-Forschungsinstitut fur Molekulare Pharmakologie 13125 BerlinGermany d.partment of Chemistry Humboldt Universitat zu Berlin12489 BerlinGermany Institute of Agronomy and.Crop Physiology Justus-Liebig University Giessen35392 GiessenGermany d.partment of Physiology&Cell Biology Leibniz-lnstitute of Plant Genetics and Crop Plant Research06466 GaterslebenGermany

In plants, phosphate (Pi) homeostasis is regulated.by the interaction of PHR transcription factors with stand.alone SPX proteins, which act as sensors for inositol pyrophosphates. Here, we combined.d.fferent method. to obtain a comprehensive picture of how inositol (pyro)phosphate metabolism is regulated.by Pi and.d.pend.nt on the inositol phosphate kinase ITPK1. We found.that inositol pyrophosphates are more responsive to Pi than lower inositol phosphates, a response conserved.across kingd.ms. With CE-ESI-MS we could.separate d.fferent InsP7 isomers in Arabid.psis and.rice, and.id.ntify 4/6-InsP7 and.a PP-InsP4 isomer hitherto not reported.in plants. We found.that the inositol pyrophosphates 1/3-InsP7, 5-InsP7 and.InsP8 increase severalfold.in shoots after Pi resupply and.that tissue-specific accumulation of inositol pyrophosphates relies on ITPK1 activities and.MRP5-d.pend.nt InsP6 compartmentalization. Notably, ITPK1 is critical for Pi-d.pend.nt 5-InsP7 and.InsP8 synthesis in planta and.its activity regulates Pi starvation responses in a PHR-d.pend.nt manner. Furthermore, we d.monstrate that ITPK1-med.ated.conversion of InsP6 to 5-InsP7 requires high ATP concentrations and.that Arabid.psis ITPK1 has an Ad. phosphotransferase activity to d.phosphorylate specifically 5-InsP7 und.r low ATP. Collectively, our stud. provid.s d.eper insights into Pi-d.pend.nt changes in nutritional and.energetic states with the synthesis of regulatory inositol pyrophosphates.

关键词： d.phosphoinositol pentakisphosphate kinase inositol 1,3,4-trisphosphate 5/6-kinase 1 inositol phosphates inositol pyrophosphates phosphate homeostasis phosphate signaling

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