Influence of Lag Effect, Soil Release, And Climate Change on Watershed Anthropogenic Nitrogen Inputs and Riverine Export Dynamics

This study demonstrates the importance of the nitrogen-leaching lag effect, soil nitrogen release, and climate change on anthropogenic N inputs (NANI) and riverine total nitrogen (TN) export dynamics using a 30-yr record for the Yongan River watershed in eastern China. Cross-correlation analysis indicated a 7-yr, 5-yr, and 4-yr lag time in riverine TN export in response to changes in NANI, temperature, and drained agricultural land area, respectively. Enhanced by warmer temperature and improved agricultural drainage, the upper 20 cm of agricultural soils released 270 kg N ha(-1) between 1980 and 2009. Climate change also increased the fractional export of NANI to river. An empirical model (R(2) = 0.96) for annual riverine TN flux incorporating these influencing factors estimated 35%, 41%, and 24% of riverine TN flux originated from the soil N pool, NANI, and background N sources, respectively. The model forecasted an increase of 45%, 25%, and 6% and a decrease of 13% in riverine TN flux from 2010 to 2030 under continued development, climate change, status-quo, and tackling scenarios, respectively. The lag effect, soil N release, and climate change delay riverine TN export reductions with respect to decreases in NANI and should be considered in developing and evaluating N management measures

The role of law in the control of obesity in England : looking at the contribution of law to a healthy food culture

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article is available from: http://www.anzhealthpolicy.com/content/5/1/21 DOI: 10.1186/1743-8462-5-21Obesity levels in England are significantly higher than in much of the rest of Europe. This article examines aspects of the physical and cultural context of food consumption in England, and the evolution of government policy on obesity, as a background to an analysis of how law might play a role in obesity prevention. Research suggests that individual food choices are associated with cultural and socio-economic circumstances and that they can be manipulated by advertising, food packaging and presentation. This suggests that there might be ways of using law to manage the influences on food choices, and of using law in support of strategies to redirect food choices towards healthy food products. Law is a particularly useful tool in the protection of the individual against the economic power of the food industry, and there is much that law can do to change the physical, economic and social environment of food consumption.Peer reviewe