Results 11 to 20 of about 6,264 (209)

Shrub-facilitated invasion accelerates desertification. [PDF]

Ecol Appl
Abstract In theory, increasing sensitivity of primary productivity to precipitation variability is a biophysical symptom of dryland degradation, or “desertification,” but empirical tests of this in the context of biological invasions are scant. To test the potential for exotic grass invasion to exacerbate biophysical symptoms of desertification, we ...
Lucero JE, Lortie CJ, Filazzola A, Callaway RM.   +3 more
europepmc   +2 more sources

The role of bison (Bison bison) herbivory in the function of semi-arid grasslands of Arizona. [PDF]

Ecol Appl
Abstract The American Plains Bison (Bison bison) is recognized as a grassland keystone species; however, their effect on grassland ecosystem function can vary widely among different plant communities, ranging from degradation to enhancement. Grazing dynamics, environmental conditions, and the capacity for plants to compensate for losses due to ...
Musto DT, Schoenecker KA, Knapp AK, von Fischer JC, Aldridge CL.   +4 more
europepmc   +2 more sources

Evaluation of Therapeutic Opioids in Hair of Neonatal and Pediatric Patients. [PDF]

Drug Test Anal
This study investigated the incorporation of novel and traditional medically used opioids into the hair of 118 pediatric and neonatal patients. Concentrations (median [range]) in hair were as follows: fentanyl: 4.03 pg/mg [0.10–343], sufentanil: 0.31 pg/mg [0.10–8.64], remifentanil: 0.14 pg/mg [0.10–0.43], and morphine: 27.4 pg/mg [1.0–1870].
Polke M, Zapf F, Restin T, Kraemer T, Binz TM.   +4 more
europepmc   +2 more sources

Precipitation Conditions Constrain the Sensitivity of Aboveground Net Primary Productivity in Tibetan Plateau Grasslands to Climate Change

Remote Sensing, 2023
Continued climate warming and precipitation fluctuations are expected to further affect aboveground net primary productivity (ANPP) across alpine grasslands, with associated implications for ecosystem functions.
Na Zeng, Xiaoli Ren, Honglin He, Li Zhang, Zhongen Niu   +4 more
doaj   +1 more source

Vegetation Productivity Dynamics in Response to Climate Change and Human Activities under Different Topography and Land Cover in Northeast China

Remote Sensing, 2021
Net primary productivity (NPP) is the total amount of organic matter fixed by plants from the atmosphere through photosynthesis and is susceptible to the influences of climate change and human activities.
Hui Li, Hongyan Zhang, Qixin Li, Jianjun Zhao, Xiaoyi Guo, Hong Ying, Guorong Deng, Wu Rihan, Shuling Wang   +8 more
doaj   +1 more source

Quantifying the Influence of Climate Change and Anthropogenic Activities on the Net Primary Productivity of China’s Grasslands

Remote Sensing, 2022
As one of China’s most common vegetation types, grasslands comprise about 27.5% of its terrestrial area and 41% of its carbon storage. Since climate change (CC) and human activities (HA) have a great effect on grasslands, quantifying the contributions of
Xiafei Zhou, Binbin Peng, Ying Zhou, Fang Yu, Xue-Chao Wang   +4 more
doaj   +1 more source

Sensitivity of productivity to precipitation amount and pattern varies by topographic position in a semiarid grassland

Ecosphere, 2021
Aboveground net primary productivity (ANPP) in grasslands is an important integrator of terrestrial ecosystem function, a key driver of global biogeochemical cycles, and a critical source of food for wild and domesticated herbivores.
David L. Hoover, William K. Lauenroth, Daniel G. Milchunas, Lauren M. Porensky, David J. Augustine, Justin D. Derner   +5 more
doaj   +1 more source

Elevated CO₂ does not increase eucalypt forest productivity on a low-phosphorus soil [PDF]

, 2017
Rising atmospheric CO2 stimulates photosynthesis and productivity of forests, offsetting CO2 emissions. Elevated CO2 experiments in temperate planted forests yielded ~23% increases in productivity over the initial years.
AC Finzi, AN Gherlenda, B Sakschewski, BE Medlyn, C Körner, D Schimel, DS Goll, EJ Edwards, EVJ Tanner, GB Bonan, H Lambers, JE Drake, JJ Elser, JQ Chambers, KI Paul, KY Crous, MA de Graaff, ML McCormack, P Friedlingstein, P Friedlingstein, PB Reich, PM Cox, Q Zhang, R Oren, RA Duursma, RJ Norby, RS Nowak, S Sitch, SC Reed, SI Seneviratne, SL Piao, TE Gimeno, VK Arora, YD Pan   +33 more
core   +3 more sources

Annual Net Primary Productivity of Different Functional Groups as Affected by Different Intensities of Rainfall Reduction in the Semiarid Grasslands of the Gauteng Province in South Africa

Agronomy, 2021
Rainfall variability is expected to change the soil water regime thereby impacting negatively on rangeland species composition, productivity and ecosystem services.
Thabo Patrick Magandana, Abubeker Hassen, Eyob H. Tesfamariam   +2 more
doaj   +1 more source

Ecohydrological Controls on Grass and Shrub Above-ground Net Primary Productivity in a Seasonally Dry Climate [PDF]

, 2015
Seasonally dry, water‐limited regions are often co‐dominated by distinct herbaceous and woody plant communities with contrasting ecohydrological properties.
Bras, Rafael L., Goulden, Michael L., Parolari, Anthony J.   +2 more
core   +2 more sources