@article {KNZ001623,
	title = {The effect of experimental warming and precipitation change on proteolytic enzyme activity: positive feedbacks to nitrogen availability are not universal},
	journal = {Global Change Biology},
	volume = {18},
	year = {2012},
	pages = {2617 -2625},
	abstract = {<p>Nitrogen regulates the Earth\&$\#$39;s climate system by constraining the terrestrial sink for atmospheric CO2. Proteolytic enzymes are a principal driver of the within-system cycle of soil nitrogen, yet there is little to no understanding of their response to climate change. Here, we use a single methodology to investigate potential proteolytic enzyme activity in soils from 16 global change experiments. We show that regardless of geographical location or experimental manipulation (i.e., temperature, precipitation, or both), all sites plotted along a single line relating the response ratio of potential proteolytic activity to soil moisture deficit, the difference between precipitation and evapotranspiration. In particular, warming and reductions in precipitation stimulated potential proteolytic activity in mesic sites \&ndash; temperate and boreal forests, arctic tundra \&ndash; whereas these manipulations suppressed potential activity in dry grasslands. This study provides a foundation for a simple representation of the impacts of climate change on a central component of the nitrogen cycle.</p>},
	keywords = {LTER-KNZ},
	doi = {10.1111/j.1365-2486.2012.02685.x},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2486.2012.02685.x},
	author = {Brozostek, E.R. and John M. Blair and Dukes, J.S. and Frey, S.D. and Hobbie, S.E. and Melillo, J.M. and Mitchell, R.J. and Pendall, E.S. and P.B. Reich and Shaver, G.R. and Stefanskii, A. and Tjoelker, M.G. and Finzi, A.C.}
}
@article {KNZ001496,
	title = {Past, present, and future roles of long-term experiments in the LTER Network},
	journal = {Bioscience},
	volume = {62},
	year = {2012},
	pages = {377 -389},
	abstract = {<p>The US National Science Foundation\&ndash;funded Long Term Ecological Research (LTER) Network supports a large (around 240) and diverse portfolio of long-term ecological experiments. Collectively, these long-term experiments have (a) provided unique insights into ecological patterns and processes, although such insight often became apparent only after many years of study; (b) influenced management and policy decisions; and (c) evolved into research platforms supporting studies and involving investigators who were not part of the original design. Furthermore, this suite of long-term experiments addresses, at the site level, all of the US National Research Council\&$\#$39;s Grand Challenges in Environmental Sciences. Despite these contributions, we argue that the scale and scope of global environmental change requires a more-coordinated multisite approach to long-term experiments. Ideally, such an approach would include a network of spatially extensive multifactor experiments, designed in collaboration with ecological modelers that would build on and extend the unique context provided by the LTER Network.</p>},
	keywords = {LTER-KNZ, Climate change, global change, long-term research, LTER Network, multifactor experiments},
	doi = {10.1525/bio.2012.62.4.9},
	url = {https://academic.oup.com/bioscience/article/62/4/377/243762},
	author = {Alan K. Knapp and M.D. Smith and Hobbie, S.E. and Scott. L. Collins and Fahey, T.J. and Hansen, G.J.A. and Landis, D.A. and Kimberly J. La Pierre and Melillo, J.M. and Seastedt, T.R. and Shaver, G.R. and Webster, J.R.}
}
@inbook {KNZ00565,
	title = {Global grassland ecosystem modelling: development and test of ecosystem models for grassland systems},
	booktitle = {Global Change: Effects on Coniferous Forests and Grasslands},
	year = {1996},
	pages = {229 -270},
	publisher = {Wiley and Sons},
	organization = {Wiley and Sons},
	address = {Chichester},
	keywords = {LTER-KNZ},
	author = {Parton, W.J. and Coughenour, M.B. and Scurlock, J.M.O. and Ojima, D.S. and Gilmanov, T.G. and Scholes, R.J. and Schimel, D.S. and Kirchner, T.B. and Menaut, J.C. and Seastedt, T.R. and Moya, E.G. and Kamnalrut, A. and Kinyamario, J.I. and Hall, D.O.},
	editor = {Breymeyer, A.I. and Hall, D.O. and Melillo, J.M. and Agren, G.I.}
}
@inbook {KNZ00563,
	title = {Impact of climate and atmospheric carbon dioxide changes on grasslands of the world},
	booktitle = {Global Change: Effects on Coniferous Forests and Grasslands},
	year = {1996},
	pages = {271 -312},
	publisher = {Wiley and Sons},
	organization = {Wiley and Sons},
	address = {Chichester},
	keywords = {LTER-KNZ},
	author = {Ojima, D.S. and Parton, W.J. and Coughenour, M.B. and Scurlock, J.M.O. and Kirchener, T.B. and Kittel, T.G.F. and Hall, D.O. and Schimel, D.S. and Moya, E.G. and Gilmanov, T.G. and Seastedt, T.R. and Kamnalrut, A. and Kinyamario, J.I. and Long, S.P. and Menaut, J.C. and Sala, O.E. and Scholes, R.J. and van Veen, J.A.},
	editor = {Breymeyer, A.I. and Hall, D.O. and Melillo, J.M. and Agren, G.I.}
}
