Climate Variability Induced Shifts In Nitrogen Loading From Terrestrial To Aquatic Ecosystems | 109076
Advances in Crop Science and Technology
Our Group organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.
Nitrogen is a critical nutrient linked to degradation of freshwater and marine ecosystems. The nitrogen inputs
to terrestrial ecosystems and subsequent loadings to aquatic ecosystems have been doubled and changed the
nitrogen cycle as population and human activities increased over the past century (Filoso et al., 2006; Howarth and
Marino, 2006; Smil, 1999; Vitousek et al., 1997; Larsson et al., 1985). One of the consequences of human alternation
of the nitrogen cycle is the eutrophication of marine and freshwater ecosystems (Rabalais, 2002; McIsaac et al., 2001).
We tested if climate variability can change nitrogen loading from terrestrial to aquatic ecosystems. We used stream
nitrogen concentrations from 2,125 sites and climate data from 301 stations from 30 eco-regions across British
Columbia, Canada, to test our objective and to compare it with anthropogenic loading of nitrogen in the same
regions. We show that elevated air temperature and associated precipitation resulted in increase in nitrogen loading
from terrestrial to aquatic ecosystems. Furthermore, inorganic nitrogen (IN) loading increased more rapidly than
organic nitrogen (ON) with increasing air temperature. Each oC increment annual air temperature caused a 24%
increase in nitrogen loading to aquatic ecosystems and a 22% increase in ratio of IN: ON concentrations in stream
water. We also show that the coastal mountains ecosystems seem to be more vulnerable to temperature induced
nitrogen loss than the interior ecosystems. We suggest that climate warming and elevated loading of nitrogen from
terrestrial to aquatic ecosystems will have major implications for the quality of water in freshwater and coastal
1. Jacques St Laurent, and Asit Mazumder 2014. Influence of seasonal and inter-annual hydro-meteorological
variability on surface water fecal coliform concentration under varying land-use composition. Water Research
2. Hurley, T. and A. Mazumder 2013. Spatial scale of land-use impacts on riverine drinking water source quality.
Water Resources Research 49: 1591-1601.
3. Zhanxue Zhu, Klaas Broersma, Asit Mazumder 2012. Impacts of land use, fertilizer and manure application
on the stream nutrient loadings in the Salmon River Watershed, South-Central British Columbia, Canada. J.
Environmental Protection 3: 809-822.
4. Zhu, Z, K. Broersma and A. Mazumder. 2011. Model Assessment of Cattle and Climate Impacts on Stream Fecal
Coliform Pollution in the Salmon River Watershed, British Columbia, Canada. Water, Air and Soil Pollution
5. Zhu, Z. R. Nordin & A. Mazumder. 2008. Soil and vegetation as the determinants of lake nitrogen concentrations
in forested watersheds. Ecological Indicators 8: 431-441.
Dr. Asit Mazumder, Professor of Biology at the University of Victoria, is considered a world leader for his pioneering research on aquatic ecosystems in terms of water quality, nutrient dynamics, foodweb structure, contaminant transport and public health risks. His research showed how land-use and climate variability affect chemical and microbial quality of water, and developed several new technologies to track sources of chemical and microbial contaminant. He had been awarded the Chandler-Misener Award by the International Association for Great Lakes Research, and the Miller Institute Professorship for Basic Science at the University of California Berkeley 2011, and Ruth Patrick Award by American Society of Limnology and Oceanography (ASLO) in 2013 for his contributions to solving water quality problems with sound aquatic sciences concepts and a 1000 talent award from the Government of China. He has published over 140 international peer reviewed journal publications.
Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals