{"id":1794,"date":"2020-07-31T08:45:00","date_gmt":"2020-07-31T08:45:00","guid":{"rendered":"http:\/\/jenaexperiment.uni-jena.de\/?p=1794"},"modified":"2020-09-01T08:17:50","modified_gmt":"2020-09-01T08:17:50","slug":"new-publication-from-lama-et-al-in-oecologia-plant-diversity-influenced-gross-nitrogen-mineralization-microbial-ammonium-consumption-and-gross-inorganic-n-immobilization-in-a-grassland-experiment","status":"publish","type":"post","link":"https:\/\/the-jena-experiment.de\/index.php\/2020\/07\/31\/new-publication-from-lama-et-al-in-oecologia-plant-diversity-influenced-gross-nitrogen-mineralization-microbial-ammonium-consumption-and-gross-inorganic-n-immobilization-in-a-grassland-experiment\/","title":{"rendered":"New publication from Lama et al. in Oecologia: Plant diversity influenced gross nitrogen mineralization, microbial ammonium consumption and gross inorganic N immobilization in a grassland experiment"},"content":{"rendered":"\n<div class=\"wp-block-image\"><figure class=\"alignright size-large is-resized\"><img loading=\"lazy\" src=\"\/wp-content\/uploads\/image-20.png\" alt=\"\" class=\"wp-image-1795\" width=\"374\" height=\"317\" srcset=\"\/wp-content\/uploads\/image-20.png 931w, \/wp-content\/uploads\/image-20-300x255.png 300w, \/wp-content\/uploads\/image-20-768x653.png 768w\" sizes=\"(max-width: 374px) 100vw, 374px\" \/><\/figure><\/div>\n\n\n\n<p class=\"justify\">Gross rates of nitrogen (N) turnover inform about the total N release  and consumption. We investigated how plant diversity affects gross N  mineralization, microbial ammonium (NH<sub>4<\/sub><sup>+<\/sup>)  consumption and gross inorganic N immobilization in grasslands via  isotopic pool dilution. The field experiment included 74 plots with 1\u201316  plant species and 1\u20134 plant functional groups (legumes, grasses, tall  herbs, small herbs). We determined soil pH, shoot height, root, shoot  and microbial biomass, and C and N concentrations in soil, microbial  biomass, roots and shoots. Structural equation modeling (SEM) showed  that increasing plant species richness significantly decreased gross N  mineralization and microbial NH<sub>4<\/sub><sup>+<\/sup> consumption  rates via increased root C:N ratios. Root C:N ratios increased because  of the replacement of legumes (low C:N ratios) by small herbs (high C:N  ratios) and an increasing shoot height, which was positively related  with root C:N ratios, with increasing species richness. However, in our  SEM remained an unexplained direct negative path from species richness  to both N turnover rates. The presence of legumes increased gross N  mineralization, microbial NH<sub>4<\/sub><sup>+<\/sup> consumption and gross inorganic N immobilization rates likely because of improved N supply by N<sub>2<\/sub> fixation. The positive effect of small herbs on microbial NH<sub>4<\/sub><sup>+<\/sup>  consumption and gross inorganic N immobilization could be attributed to  their increased rhizodeposition, stimulating microbial growth. Our  results demonstrate that increasing root C:N ratios with increasing  species richness slow down the N cycle but also that there must be  additional, still unidentified processes behind the species richness  effect potentially including changed microbial community composition. <\/p>\n\n\n\n<p>Reference:<\/p>\n\n\n\n<p> Lama, S., Velescu, A., Leimer, S. <em>et al.<\/em> Plant diversity  influenced gross nitrogen mineralization, microbial ammonium consumption  and gross inorganic N immobilization in a grassland experiment.                     <em>Oecologia<\/em><strong>193, <\/strong>731\u2013748 (2020). <a href=\"https:\/\/doi.org\/10.1007\/s00442-020-04717-6\">https:\/\/doi.org\/10.1007\/s00442-020-04717-6<\/a> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gross rates of nitrogen (N) turnover inform about the total N release and consumption. We investigated how plant diversity affects gross N mineralization, microbial ammonium (NH4+) consumption and gross inorganic&hellip;<\/p>\n","protected":false},"author":2,"featured_media":1795,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[15,13],"tags":[],"_links":{"self":[{"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/posts\/1794"}],"collection":[{"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/comments?post=1794"}],"version-history":[{"count":2,"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/posts\/1794\/revisions"}],"predecessor-version":[{"id":1798,"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/posts\/1794\/revisions\/1798"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/media\/1795"}],"wp:attachment":[{"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/media?parent=1794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/categories?post=1794"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/the-jena-experiment.de\/index.php\/wp-json\/wp\/v2\/tags?post=1794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}