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4 results for “ecosystem nitrogen retention”
Data from: Ecosystem nitrogen retention is regulated by plant community trait interactions with nutrient status in an alpine meadow
1.Biotic nitrogen (N) retention is an important ecosystem function in the context of ongoing land use intensification, N deposition and global warming. However, a paucity of experimental evidence limits understanding of how different plant community components influence N retention in terrestrial ecosystems. 2.In this investigation we conducted a 15N labelling experiment to test how plant community properties, including plant species richness/diversity, dominance and functional traits, influence plant N uptake and retention under different nutrient availabilities. A three-year experiment examined the effects of adding N (10 g N m−2 year−1) and phosphorus (P) (5 g P m−2 year−1) to an alpine meadow on the Qinghai-Tibetan Plateau. 3.Results show that 15N retention increased with the addition of N and P; the addition of P produced the largest increase of 15N retention in plant and soil N pools. Changes in soil nutrient conditions also facilitated different plant community controls on ecosystem N retention. Ecosystem 15N retention was influenced by species richness and root biomass in the control plots; whereas the N addition treatment showed an important effect of community-weighted means (CWM) of specific leaf area (SLA), and plots with additional P recorded lower CWM of root nitrogen content (root N) and larger CWM root:shoot ratios (R/S) as important determinants. 4.Synthesis. Ecosystem N retention was influenced by conservative and exploitative plant species and/or their traits under N deficient and abundant conditions, respectively, whereas species richness and community plant biomass were most influential under control conditions. The discovery of an interaction between plant community traits and nutrient biogeochemistry as a mechanism for ecosystem N retention offers a means to predict how vegetation in alpine meadow ecosystems will respond to expected global change.
Nitrogen redistribution and seasonal trait fluctuation facilitate plant N conservation and ecosystem N retention
<ol> <li><span>Low available soil nitrogen (N) limits plant productivity in alpine regions, and alpine plants thus resorb and reallocate N from senescing tissues to conserve this limited N during the nongrowing season. However, the destination and extent of N redistribution during plant senescence among above- and below-ground organs, let alone other processes of translocation outside of plants and into the soil components, remain poorly understood. </span></li> <li><span>Utilizing the <sup>15</sup>N stable isotope as a tracer, we quantified N redistribution among above- and below-ground plant organs and different soil components during senescence in an alpine meadow ecosystem, and explored the relationship between <sup>15</sup>N among plant-soil N pools with seasonal fluctuations of plant functional traits.</span></li> <li><span>We found a substantial depletion of <sup>15</sup>N in fine roots (-40% ± 2.8%) and aboveground tissues (-51% ± 5.1%), and an enhanced <sup>15</sup>N storage primarily in coarse roots (+79% ± 27%) and soil organic matter (+37% ± 10%) during plant senescence. In parallel, we observed a temporal variation in plant functional traits, representing a shift from more acquisitive to more conservative strategies as the growing season ends, such as higher coarse root N and coarse root to fine root ratio. The seasonal trait variations were highly correlated with the <sup>15</sup>N retention in coarse roots and soil organic matter. Particularly, <sup>15</sup>N retention in particulate and mineral-associated organic matter increased by 30% ± 12% and 24% ± 9%, respectively, suggesting a potential pathway through which fine root and microbial mortality contribute to <sup>15</sup>N redistribution into soil N pools during senescence.</span></li> <li> <span><em>Synthesis</em>. </span><span>N redistribution and seasonal plant trait fluctuation facilitate plant N conservation and ecosystem N retention in the alpine system. This study suggests a coupled aboveground-belowground N conserving strategy that may optimize the temporal coupling between plant N demand and ecosystem N supply in N-limited alpine ecosystems. </span> </li> </ol>
Data from: Ecosystem nitrogen retention is regulated by plant community trait interactions with nutrient status in an alpine meadow
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Nitrogen redistribution and seasonal trait fluctuation facilitate plant N conservation and ecosystem N retention
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