@inbook {JRN52665,
	title = {Patterns of net primary production across sites},
	booktitle = {Long-Term Trends in Ecological Systems: A Basis for Understanding Responses to Global Change},
	year = {2013},
	pages = {42-45},
	publisher = {National Technical Information Services},
	organization = {National Technical Information Services},
	chapter = {5},
	address = {Springfield, Virginia},
	abstract = {<p>Net primary production (NPP) is a fundamentally important and commonly measured ecosystem process that provides an integrative estimate of energy capture and flow into systems, and consequently the energy available for use by other trophic levels. A wide range of productivity levels occurs globally with high temporal dynamics among sites. This chapter discusses approaches to estimating NPP, highlights site-specific trends in productivity, and provides examples of past synthetic analyses across space and time. In terrestrial ecosystems, aboveground NPP are commonly measured or estimated. In many sites, spatial variation in NPP among locations within a site can overwhelm temporal variation.\&nbsp; In terms temporal patterns, at some sites clear temporal trends exist: NPP either increases or decreases with time; at other sites, strong interannual variations exist.\&nbsp; Past synthetic analyses have provided key insights into the relative roles of biotic versus abiotic drivers of dynamics as well as elucidating where and when biogeochemical versus climatic factors underlie patterns of NPP across biomes.\&nbsp; The chapter proposes four questions that can be addressed as long-term data sets at more sites become available.</p>
},
	keywords = {atmospheric chemistry, climate change, cross-site comparisons, disturbance, ecological response, ecology, ecosystem, EcoTrends, experimental forests, global change, human demography, human population growth, Long Term Ecological Research (LTER), long-term datasets, precipitation, rangeland, rangeland research stations, surface water chemistry},
	url = {/files/bibliography/13-029-5.pdf},
	author = {A. K. Knapp and M. D. Smith and Debra C. Peters and S.L. Collins}
}
@article {49953,
	title = {Patterns of net primary production across sites. Cross-site comparisons of state change dynamics},
	year = {2011},
	abstract = {<p>Net primary production (NPP) is a fundamentally important and commonly measured ecosystem process that provides an integrative estimate of energy capture and flow into systems and consequently of the energy available for use by other trophic levels. A wide range of productivity levels occurs globally (figure 5-1) with high temporal dynamics among sites (chapter 14). In this brief overview, we discuss approaches to estimating NPP, highlight site-specific trends in productivity, and provide examples of past synthetic analyses across space and time. We focus on aboveground components of NPP for reasons explained below.</p>
},
	keywords = {cross-site comparisons, global change, net primary production, NPP},
	url = {files/bibliography/JRN00580.pdf},
	author = {A. K. Knapp and M. D. Smith and Debra C. Peters and S.L. Collins}
}
