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Displaying 481 - 485 of 1195Urban noise affects song structure and daily patterns of song production in Red-winged Blackbirds (Agelaius phoeniceus)
Traffic noise is becoming a more prominent fixture in urban environments as cities and highways expand to accommodate the growing human population. Birds, in particular, rely heavily on vocal communication and have recently been shown to change the structure of their signals in response to environmental noise. Our objective was to determine the impact of traffic noise on Red-winged Blackbird (Agelaius phoeniceus) song structure and song timing.
Soil fertility and its significance to crop productivity and sustainability in typical agroecosystem: a summary of long-term fertilizer experiments in China
AIMS AND BACKGROUND: Soil fertility quality index is a useful indicator that helps to improve sustainable land use management and achieve economical yield in agriculture production. The objectives of this study were to evaluate the changes of soil fertility quality between the 1980s and 2000s in different cropping systems and its significance to crop productivity and sustainability.
Biological indicators of soil quality and soil organic matter characteristics in an agricultural management continuum
Relationships among biological indicators of soil quality and organic matter characteristics were evaluated across a continuum of long-term agricultural practices in Missouri, USA. In addition to chemical and physical soil quality indicators, dehydrogenase and phenol oxidase activity were measured, ¹³C nuclear magnetic resonance (¹³C NMR) and diffuse reflectance Fourier transform (DRIFT) spectra of soil organic matter were collected, and visible, near-infrared reflectance (VNIR) spectra of whole soil were collected.
Influencing factors on the implementation of forest reserves in Switzerland
In 1999, an international expert team found the neglect of biodiversity issues in Swiss forest policy to be one of its biggest weaknesses. Influenced by this scientific assessment, the Federal Forest Agency developed forest reserve guidelines with measurable objectives in cooperation with the constituent states (cantons). To assess the outcomes of the Swiss forest reserve concept, we surveyed cantons’ implementation degree in 2011. In a previous paper, Kaeser et al.
Climate-smart agriculture global research agenda: scientific basis for action
BACKGROUND: Climate-smart agriculture (CSA) addresses the challenge of meeting the growing demand for food, fibre and fuel, despite the changing climate and fewer opportunities for agricultural expansion on additional lands. CSA focuses on contributing to economic development, poverty reduction and food security; maintaining and enhancing the productivity and resilience of natural and agricultural ecosystem functions, thus building natural capital; and reducing trade-offs involved in meeting these goals.