RNR_Exam_3

RNR_Exam_3 - RNR Exam 3 Notes Forests Friday, October 19,...

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Unformatted text preview: RNR Exam 3 Notes Forests Friday, October 19, 2007 Conservation of Forest Resources Increasing public attention during the past few decades Rain Forest Destruction - public concern all over the world. We lose a lot of rainforest. Logging Controversies - how we harvest new trees differ depending on different situations. The best way to harvest trees is a clear cut - ends in a tremendous amount of erosion. There are a lot of questions on how we should do this. Harvest a large continuous area? Loss of forest-dwelling species Spotted Owl - United States - shut down logging in certain areas of Oregon Red (something) Woodpecker - United States Golden Lion Tamari -Brazil Mountain Gorilla - Rwanda and Burundi Forest Values Forest Products - how is the forest valued?- 2002 wood and paper trade products worth $140 billion Forests are important parts of the aquifer recharge systems- when it rains the roots help keep the ground broken up so te wter can get down into the soil and recharge aquifers; without Important for ground water dynamics Soil Stabilization - stream banks will be stabilized by the surrounding forests Biogeochemical and hydrologic pump - trees very involved in process. Trees put down root systems that pick up nutrients, in fall leaves fall off and land on ground Fuel - not so much in the U.S. (we have fire places) but in many other parts of the world uses trees as a source of heat (in Less Developed Countries) Local Climat e - (cloud of mist over trees) - w/ water trees pump out of the ground, they product mist over them Recreation Wildlife Habitat - "as the forest goes, so goes the animals" Forest Types- Ways to classify forests Softwoods Lower density wood fibers 1 Long, straight trunks, few limbs Evergreen Easy to work with Pine, Fir Hardwoods Dense wood fibers Many limbs, little "straight" wood Deciduous - lose leaves annually Difficult to work with (hope or hickory hard to work with - expensive) Oak, Hickory, Ash, Walnut Map - Oak-gum-cypress - Through Midwest, through mountain parts Oak-hickory - Longleaf-slash pine - Southeast area - by Florida Loblolly-shortleaf pine - Loblolly - has a long grass stage Forest Stands - A group of trees in an area that are similar in species composition age, and structure, and can be distinguished from adjoining forests Standing dynamics - competing species, sunlight, etc are important (this isn't the right definition) How do we get Forests? Primary Succession -> Old Growth Forests 1. Exposed Rocks - Usually from old lava flow 2. Pioneer Community - Lichens ,Mosses 3. Intermediate Communities a. Grasses, Herbs, Shrubs, Tree Seeding - b. Aspen, Clack spruce, Jack Pine 4. Climax Community - White spruce, Balsam fir, paper birch Secondary succession -> Secondary forests If a forest burns or wee cut it down, it doesn't start form the very beginning (exposed rocks) It usually isn't the same as you would get with the primary...
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RNR_Exam_3 - RNR Exam 3 Notes Forests Friday, October 19,...

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