The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.
-
Upload
quentin-greer -
Category
Documents
-
view
215 -
download
1
Transcript of The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.
![Page 1: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/1.jpg)
The grass is always greener (than the forest): is it the N?
Hannah TremblayCarleton College, 2014
![Page 2: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/2.jpg)
Background
•Fertilization and fossil fuels have more than doubled amount of available N in biosphere
•Expansion of suburbs is one of the fastest growing land uses
•Recent evidence suggests that urban soils may be a sink for atmospheric N (Raciti et al. 2008)
![Page 3: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/3.jpg)
The experiment
• To quantify the differences in total soil nitrogen, available nitrate, and nitrification rates between residential lawns and forested areas in northern New Hampshire.
•How does the land use shift from forests to lawns affect nitrification and mineralization rates?
![Page 4: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/4.jpg)
Methods: site selection
•12 clusters•58 sites•Personal
interview and questionnaire
![Page 5: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/5.jpg)
Methods:In the field•5 volumetric,
5.8cm diameter, 15cm deep cores from lawns and adjacent forests
•Vegetative cover and tree inventory recorded
•Measured area of property
![Page 6: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/6.jpg)
Methods: In the lab•Soil sieved and homogenized•Two 20 gram subsamples
▫“Time 0” extraction: placed in a 250 ml Nalgene bottle with 100ml of 2M KCl. Settled for 24 hours.
▫“Time final” extraction: incubated for 21 days in a 1 pint mason jar and fanned every 3 days.
•Soil samples filtered and analyzed
![Page 7: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/7.jpg)
Methods: In the lab
![Page 8: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/8.jpg)
Results
P-value < .05
![Page 9: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/9.jpg)
Moving forward
•Nitrification and mineralization rates
•Investigation of historical land use
•Relationship with vegetation
•Demographic information
![Page 10: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/10.jpg)
Thank you•Craig See•Adam Wild•Clarissa Lyons•Austin McDonald•Shinjini Goswami•Russell Auwae
•Ruth Yanai
•Melany Fisk•Tim Fahey•Paul Lilly•Peter Groffman•Paige Warren•Matt Vadeboncoeur
![Page 11: The grass is always greener (than the forest): is it the N? Hannah Tremblay Carleton College, 2014.](https://reader038.fdocuments.in/reader038/viewer/2022103122/56649cd85503460f949a0945/html5/thumbnails/11.jpg)
References
•Raciti SM, Groffman PM, Fahey TJ. 2008. Nitrogen retention in urban lawns and forests. Ecol Appl 18(7):1615–26.