Diario de abg2177

I found that The Nature Conservancy on Nature.org posts 'updates' on many issues and facts about Long Island, where I live/other close places. This specific pamphlet includes goals and
such as clean water, great nature hikes/paths, certain species, both abundant and threatened, and their overall mission "to conserve the lands and waters on which all life depends."
It is really useful to me because it introduced many new and informative aspects of my home, and how I can go about/get involved in these issues.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=2ahUKEwjP8O34q-PoAhVOmHIEHR5vALsQFjADegQIARAB&url=https%3A%2F%2Fwww.nature.org%2Fcontent%2Fdam%2Ftnc%2Fnature%2Fen%2Fdocuments%2Flong-island-spring-summer-2017-newsletter.pdf&usg=AOvVaw2MwPKIvLhqflDzsxyiSaXN

Furthermore, The Nature Conservancy, a reliable, non-profit organization, posts local stories about Long Island Water Quality, and other informative matters that are useful and interesting because they relate to my county and other nearby areas.
https://www.nature.org/en-us/about-us/where-we-work/united-states/new-york/stories-in-new-york/long-island-water-quality/long-island-water-quality-videos/

This article, from the Web of Science database, features both topics of American Sweetgum (Liquidambar styraciflua) and urban settings. It was featured in the Journal of Arboriculture 18(1): January 1992, written by J. Clarki, R. Kjelgran, J. Hushagen and J. Fiore.
They focus on cambial electrical resistance (CER) as a measure of tree vigor, specifically in urban areas, such as the mentioned six sites in Seattle, Washington. The CER measure the electrical flow resistance in tree's stems, as a function of the content (cells and solute) in the tree's cambium. Most healthy trees would have the thickest cambium, and have a low CER reading.
The experiment discusses the many factors involved, including the soil details, growth and development of the sweetgums at each site, seasonal ranges of CER, and other variation and informative characteristics of the grown trees that were tested.
Interestingly, they found that the most rapidly growing trees did not subsequently rate with the lowest CER values, as being most vigorous.
This led them to synthesize that CER, in fact, did not show a true relationship of the urban trees' vigor here, but was a flawed measure because there was too much variation in CER readings. The multiple significant factors that contributed to this are listed and discussed.
However, CER measuring of vigor has been reportedly successful in other experiments, but never in situations like this, with the evaluation "of single trees in diverse urban environments."

Clark, J., Kjelgran, R., Hushagen, J., & Fiore, J. (1992). Cambial electrical resistance does not assess
vitality of individual sweet gum trees. Journal of Arboriculture, 18(1), 1 – 5.
http://apps.webofknowledge.com.ezproxy.cul.columbia.edu/full_record.do?product=UA&search_mode=GeneralSearch&qid=13&SID=7Cp5UU4GBkFQHOcFoaK&page=1&doc=3