02777nas a2200253 4500008004100000245012200041210006900163300001600232490000700248520194500255100002402200700002502224700001302249700002002262700002402282700002402306700002302330700002702353700002602380700002202406700002402428700002202452856004902474 2018 eng d00aRegional grassland productivity responses to precipitation during multiyear above- and below-average rainfall periods0 aRegional grassland productivity responses to precipitation durin a1935 - 19510 v243 a
There is considerable uncertainty in the magnitude and direction of changes in precipitation associated with climate change, and ecosystem responses are also uncertain. Multiyear periods of above- and below-average rainfall may foretell consequences of changes in rainfall regime. We compiled long-term aboveground net primary productivity (ANPP) and precipitation (PPT) data for eight North American grasslands, and quantified relationships between ANPP and PPT at each site, and in 1-3 year periods of above- and below-average rainfall for mesic, semiarid cool, and semiarid warm grassland types. Our objective was to improve understanding of ANPP dynamics associated with changing climatic conditions by contrasting PPT-ANPP relationships in above- and below-average PPT years to those that occurred during sequences of multiple above- and below-average years. We found differences in PPT-ANPP relationships in above- and below-average years compared to long-term site averages, and variation in ANPP not explained by PPT totals that likely are attributed to legacy effects. The correlation between ANPP and current- and prior-year conditions changed from year to year throughout multiyear periods, with some legacy effects declining, and new responses emerging. Thus, ANPP in a given year was influenced by sequences of conditions that varied across grassland types and climates. Most importantly, the influence of prior-year ANPP often increased with the length of multiyear periods, whereas the influence of the amount of current-year PPT declined. Although the mechanisms by which a directional change in the frequency of above- and below-average years imposes a persistent change in grassland ANPP require further investigation, our results emphasize the importance of legacy effects on productivity for sequences of above- vs. below-average years, and illustrate the utility of long-term data to examine these patterns.
1 aPetrie, Matthew, D.1 aPeters, Debra, P. C.1 aYao, Jin1 aBlair, John, M.1 aBurruss, Nathan, D.1 aCollins, Scott., L.1 aDerner, Justin, D.1 aGherardi, Laureano, A.1 aHendrickson, John, R.1 aSala, Osvaldo, E.1 aStarks, Patrick, J.1 aSteiner, Jean, L. uhttps://www.ncbi.nlm.nih.gov/pubmed/2926556800988nas a2200325 4500008004100000245011200041210006900153300001200222490000900234100002200243700002100265700002000286700001500306700002100321700001700342700001500359700002400374700001700398700002000415700002200435700002000457700001800477700001800495700002100513700002400534700001900558700001700577700001900594856004900613 2014 eng d00aKnowledge and tools to enhance resilience of beef grazing systems for sustainable animal protein production0 aKnowledge and tools to enhance resilience of beef grazing system a10 - 170 v13281 aSteiner, Jean, L.1 aEngle, David, M.1 aXiao, Xiangming1 aSaleh, Ali1 aTomlinson, Peter1 aRice, C., W.1 aCole, Andy1 aColeman, Samuel, W.1 aOsei, Edward1 aBasara, Jeffrey1 aMiddendorf, Gerad1 aGowda, Prasanna1 aTodd, Richard1 aMoffet, Corey1 aAnandhi, Aavudai1 aStarks, Patrick, J.1 aOcshner, Tyson1 aReuter, Ryan1 aDevlin, Daniel uhttps://www.ncbi.nlm.nih.gov/pubmed/25376887