TY - JOUR T1 - High carbon use efficiency in soil microbial communities is related to growth, not storage compound synthesis. JF - Soil Biology and Biochemistry Y1 - 2015 A1 - P Dijkstra A1 - Salpas,E A1 - Fairbanks,D A1 - Miller,EB A1 - Hagerty,SB A1 - KJ van Groenigen A1 - Hungate,BA A1 - Marks,JC A1 - GW Koch A1 - Schwartz,E VL - 89 N1 - [Original String]:Dijkstra, P., Salpas, E., Fairbanks, D., Miller EB, Hagerty, S.B., van Groenigen, K.J., Hungate, B.A., Marks, J.C., Koch, G.W., and Schwartz, E. (2015). High carbon use efficiency in soil microbial communities is related to growth, not storage compound synthesis. Soil Biology and Biochemistry 89, 35-43. ER - TY - Generic T1 - Influence of varying nitrogen availability on soil microbial growth efficiency. T2 - Ecological Society of America Annual Meeting Y1 - 2015 A1 - Hagerty,SB A1 - KJ van Groenigen A1 - Schwartz,E A1 - Hungate,BA A1 - GW Koch A1 - P Dijkstra JF - Ecological Society of America Annual Meeting T3 - Ecological Society of America Annual Meeting PB - ESA CY - Baltimore, MD, USA N1 - [Original String]:Hagerty, S.B., van Groenigen, K.J., Schwartz, E., Hungate, B.A., Koch, G.W. and Dijkstra, P. (2015). Influence of varying nitrogen availability on soil microbial growth efficiency. ESA Aug 9-14, Baltimore. ER - TY - JOUR T1 - Biogeochemical and ecological feedbacks in grassland responses to warming JF - Nature Climate Change Y1 - 2012 A1 - Wu,Z A1 - Dijkstra, A1 - GW Koch A1 - B Hungate VL - 2 ER - TY - JOUR T1 - Responses of ecosystem carbon cycling to climate change treatments along an elevation gradient JF - Ecosystems Y1 - 2011 A1 - Wu,Z A1 - GW Koch A1 - P Dijkstra A1 - MA Bowker A1 - B Hungate VL - 14 IS - 7 ER - TY - JOUR T1 - Genetic‐based plant resistance and susceptibility traits to herbivory influence needle and root litter nutrient dynamics JF - Journal of Ecology Y1 - 2007 A1 - Classen,AT A1 - Chapman,SK A1 - TG Whitham A1 - Hart,SC A1 - GW Koch AB - Summary 1 It is generally assumed that the same factors drive the decomposition of both litter and roots and that nutrient release from litter and roots is synchronized. However, few studies have explicitly tested these assumptions, and no studies have examined whether plant genetics (i.e. plant susceptibility to herbivory) could affect these relationships. 2 Here we examine the effects of herbivore susceptibility and resistance on needle and fine root litter decomposition of pi帽on pine, Pinus edulis . The study population consists of individual trees that are either susceptible or resistant to herbivory by the pi帽on needle scale, Matsucoccus acalyptus , or the stem-boring moth, Dioryctria albovittella . Genetic analyses and long-term experimental removals and additions of these insects to individual trees have identified trees that are naturally resistant or susceptible to M. acalyptus and D. albovittella . In addition, these herbivores increase litter chemical quality and alter soil microclimate, both of which mediate decomposition in ecosystems. 3 The effects of herbivore susceptibility and resistance on needle litter mass and phosphorus (P) loss, when significant, are largely mediated by herbivore-induced changes to microclimate. But the effects of herbivore susceptibility and resistance on root litter nitrogen (N) and P retention, and needle litter N retention, are largely governed by herbivore-induced changes to litter chemical quality. Whether a particular tree was resistant or susceptible to herbivores exerted a large influence on net nutrient release, but the direction of herbivore influence varied temporally. 4 The controls on decomposition vary between herbivore-susceptible and herbivore-resistant phenotypes. This suggests that understanding decomposition and nutrient retention in some ecosystems may require considering the effects of herbivores on above- and below-ground processes and how these effects may be governed by plant genetics. 5 Synthesis . Because so few studies have attempted to quantify genetic components of ecosystem processes, the integration of ecosystem ecology with population genetics has the potential to place ecosystem science within a genetic and evolutionary framework. Using field trials of known genetic composition, ecosystem scientists may use quantitative genetics techniques to explore ecosystem traits just as population geneticists have used these techniques to explore traditional traits such as resistance to insects. VL - 95 UR - http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2745.2007.01297.x/full IS - 6 ER - TY - JOUR T1 - Terrestrial transects for global change research JF - Vegetation Y1 - 1995 A1 - GW Koch A1 - Vitousek,PM A1 - Steffen,WL A1 - Walker,BH AB - The International Geosphere-Biosphere Program has proposed a set of large-scale terrestrial transects to study the effects of changes in climate, land use, and atmospheric composition (“global change”) on biogeochemistry, surface-atmosphere exchange, and vegetation dynamics of terrestrial ecosystems. The transects (≈ 1000 km) will be located along existing environmental and land use intensity gradients that span transitions between biomes in regions likely to be widely affected by forcing from components of global change or where the impacts of global change are likely to feed back to affect atmospheric, climatic, or hydrologic systems. Experimental studies on the transects will examine short-term changes in ecosystem function and biosphere-atmosphere interaction in response to variation in primary controlling variables. A hierarchy of modeling approaches will develop predictions of long-term changes in biome boundaries and vegetation distribution. The proposed initial set of IGBP terrestrial transects are located in four key regions: (1) humid tropical forests undergoing land use change, (2) high latitudes including the transition from boreal forest to tundra, (3) semi-arid tropical regions including transitions from dry forest to shrublands and savannas, and (4) mid latitude semi-arid regions encompassing transitions from shrubland or grassland to forests. We discuss here the rationale and general research design of transect studies proposed for each of these priority regions. VL - 121 UR - http://link.springer.com/article/10.1007/BF00044672 ER - Error | SEGA

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