Article
Agronomy
Geoffrey P. Schortgen, Aaron J. Patton
Summary: Ammonium sulfate can reduce the antagonism of hard water on 2,4-D DMA, but the effect varies between adjuvant and fertilizer rates; It is not recommended to mix KNO3 with 2,4-D applications, as it decreases efficacy; Applicators who want to use AMS as a foliar fertilizer should apply it separately from 2,4-D DMA to prevent potential antagonism.
Article
Environmental Sciences
Michael R. McHale, Amy S. Ludtke, Gregory A. Wetherbee, Douglas A. Burns, Mark A. Nilles, Jason S. Finkelstein
Summary: This study reports trends in wet-precipitation chemistry in response to emissions reductions implemented as part of the Clean Air Act Amendments. The concentrations of sulfate and nitrate showed significant decreasing trends, while ammonium concentrations increased. The trends for sulfate and nitrate were strongest in the beginning of the study period and became weaker in later periods.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Joseph L. Domagalski, Eric Morway, Nancy L. Alvarez, Juliet Hutchins, Michael R. Rosen, Robert Coats
Summary: A study of Lake Tahoe found that the lake's water quality is declining due to algae and fine sediment, leading to a decrease in water clarity. To maintain water clarity, wastewater is exported out of the basin. Over the past 25 years, nitrate loads have decreased, while ammonium loads initially decreased and then continued to increase after 2005, and organic phosphate loads showed significant increases between 2000 and 2005.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biochemistry & Molecular Biology
Yi-Ming Weng, David H. Kavanaugh, Sean D. Schoville
Summary: The evolutionary histories of alpine species are closely related to their response to glaciation, with population structure influenced by drainage basins. Taking into account species' ecological preferences is crucial for understanding their response to climate fluctuations.
Article
Ecology
Margarita Huesca, Susan L. Ustin, Kristen D. Shapiro, Ryan Boynton, James H. Thorne
Summary: This study used airborne hyperspectral imagery to identify the most important wavelength regions predicting drought-induced tree mortality in blue oak woodlands. The best metric for predicting canopy stress was found to be a normalized ratio using specific spectral bands, with a correlation of R-2 = 0.83. The study also revealed that tree mortality prediction accuracy was highest between 1% and 10% mortality rates.
Article
Environmental Sciences
Heejeong Kim, Wendell W. Walters, Lizzy Kysela, Meredith G. Hastings
Summary: Atmospheric nitrate and sulfate, major inorganic components of particulate matter, have a significant impact on human health, ecosystem health, and air quality. This study investigated the long-term response of particle chemistry in urban and rural environments in southern New England, an area historically affected by nitrogen oxides (NOx) and sulfur dioxide (SO2) emissions. The results showed that there was a significant urban-rural aerosol chemical composition gradient within a 40 km radius. As anthropogenic influences decreased, the relative contribution of marine and crustal sources increased, affecting the chemistry of fine and coarse particles. Total mass concentrations of chemical species, particularly anthropogenic sulfate and particulate ammonium, decreased dramatically over the ten-year period at both urban and rural sites. However, nitrate concentration increased despite significant reductions in NOx emissions, indicating changes in chemical mechanisms. Furthermore, the decrease in SO2 emissions significantly impacted the atmospheric lifetime and transport distance of particulate ammonium.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Francisca Alba-Sanchez, Daniel Abel-Schaad, Jose Antonio Lopez-Saez, Silvia Sabariego-Ruiz, Sebastian Perez-Diaz, Reyes Luelmo-Lautenschlaeger, Jose Antonio Garrido-Garcia
Summary: This study analyzed two pollen records from both sides of Sierra Nevada in the western Mediterranean, revealing the early human impact on these mountains, including changes in forest cover, agriculture, livestock, mining, and metallurgy. The results suggest that human activities started earlier than expected and have had significant influences on the landscape and biodiversity of the region. Proper conservation strategies should consider long-term perspectives and the preservation of traditional human activities to maintain current biodiversity.
Article
Meteorology & Atmospheric Sciences
Yue Zhang, Yiming Yang, Leiming Zhang, Hongmei Xu, Jian Sun, Tao Wang, Fangxiang Li, Xiaojian Chang, Steven Sai Hang Ho, Bin Li, Bing Wang, Junji Cao, Zhenxing Shen
Summary: Understanding the primary emissions of sulfate, nitrate, and ammonium from solid fuel combustion is important for studying their role in haze formation. Through combustion experiments, the direct emissions of these ions from residential coal combustion and biomass burning were quantified. The emissions varied among different fuel types, with sulfate being the dominant ion. These findings suggest that primary emissions from coal combustion contribute significantly to atmospheric sulfate, especially in winter. The contribution of secondary formation to atmospheric sulfate may be overestimated in current source apportionment studies.
ATMOSPHERIC RESEARCH
(2023)
Article
Environmental Sciences
Yangyang Zhang, Xuejun Liu, Lin Zhang, Aohan Tang, Keith Goulding, Jeffrey L. Jr Jr Collett
Summary: The study reported the impact of the Clean Air Action on the chemical components of atmospheric fine particulate matter in the North China Plain, especially on secondary inorganic aerosols. The results showed significant decreases in PM(2.5) concentration and its chemical components, as well as a reduction in polluted days during the observation period.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Miao Tang, Yu Liu, Jun He, Zhe Wang, Zhijun Wu, Dongsheng Ji
Summary: The study observed a decrease in severe PM2.5 pollution episodes during the heating period in Tianjin from 2014 to 2019, with an increase in concentrations of NO3- and SO42- as air quality deteriorated.
Article
Environmental Sciences
Ziqi Gao, Cesunica E. Ivey, Charles L. Blanchard, Khanh Do, Sang-Mi Lee, Armistead G. Russell
Summary: The chemical composition of PM2.5 has a significant impact on human health and air quality. Assessing and quantifying the impacts of various factors on PM2.5 chemical components can guide effective regulations to improve air quality. Generalized additive models (GAMs) were used to assess the factors affecting different PM2.5 species in the South Coast Air Basin. Results show that precursor emissions have the most significant effect on PM2.5 species production, while meteorological factors also influence PM2.5 composition. In the future, meteorological factors will become more significant in affecting PM2.5 speciation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Chung-Te Chang, Ci-Jian Yang, Ko-Han Huang, Jr-Chuan Huang, Teng-Chiu Lin
Summary: This study quantifies the temporal changes of precipitation acidity and its dominant acidifying agents over the last two decades by synthesizing bulk precipitation chemistry in forest sites from three monitoring networks. Results show distinct declines of sulfate and nitrate depositions and increases of precipitation pH in northeast America and central and east Europe, but not in Asia during 1999 and 2018. The decreases of sulfate and nitrate depositions likely reflect the long-term effort of pollutant emission controls.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Biochemistry & Molecular Biology
Guihong Liang, Haixing Song, Yan Xiao, Zhenhua Zhang
Summary: This study explored the impact of V-ATPase activity in plant vacuoles on growth and development. The lack of two tonoplast-localized subunits of V-ATPase resulted in defective growth and excessive ammonium accumulation in plants, which could be alleviated by potassium supplementation. This research provided new insights into the relationship between V-ATPase, growth, and ammonium accumulation, while highlighting the role of potassium in mitigating ammonium toxicity.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Agronomy
Yit Leng Lee, Osumanu Haruna Ahmed, Samsuri Abdul Wahid, Mohamadu Boyie Jalloh, Adiza Alhassan Muzah
Summary: Blending and densifying biochar with NPK fertilizer can slow down nutrient release, but also increase soil ammonia volatilization compared to NPK fertilizer alone.
Article
Plant Sciences
Mi Xun, Junyuan Shi, Hui Cao, Jianfei Song, Jiaqi Li, Weiwei Zhang, Hongqiang Yang
Summary: The study found that the addition of potassium nitrate (KNO3) and wood biochar had a synergistic effect on improving root growth and sulfur (S) accumulation in apple trees. The addition of KNO3 increased enzyme activity and gene expression related to sulfate uptake and assimilation, and this effect was enhanced by wood biochar. Wood biochar alone also promoted enzyme activity and gene expression, and enhanced S distribution in roots. In the presence of wood biochar, KNO3 application decreased S distribution in roots but increased it in stems and leaves. Overall, wood biochar enhances the effect of KNO3 on S accumulation in apple trees.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2023)