Forensic Forestry Reading the Land

Transcription

1 Principles of Forest Ecology and Management or Forensic Forestry Reading the Land Jonathan Kays University of Maryland Extension

2 Where Do We Start? Think Like A Plant Act Like A Plant

3 Thinking and Acting Like a Plant What is your favorite plant? Where does it grow? How do you describe that place? What is important?

4 What Does a Plant Need? Light Water Nutrients

5 Principles of Forest Ecology Site Quality Shade Tolerance Forest Succession Plant Competition Stand Development Role of Fire, Insect & Disease, and Herbivory,

6 Site The environment or system supporting a forest, which influences trees and plants growing there. The sum of Soil, Topography, Climate, Plants, and Animals

7 Forest Succession on a Site Predictable changes in plant communities as the competing organisms respond to and modify the environment. These changes will vary depending on the site.

8 Site is More Important than the Vegetation It is more fixed It is more stable It is more easily defined Reflects disturbance Strip mine (extreme) Pasture (subtle) Harvesting (either) Look for Clues!

9 Appalachian Maryland Physiographic Regions or Sites Plateau Ridge& Valley Great Valley Blue Ridge Piedmont Coastal Plain

10 Dominant Forest Communities

11 Garrett County Alleghany Plateau

12 Allegany County - Ridge and Valley

13 Piedmont Region

14 Coastal Plain Southern Maryland

15 Coastal Plain - Eastern Shore

16 Forest Soils Foundation of Site Quality Healthiest Soils in the World Soil profile How does soil develop or form? From the bottom or the top? Where is the older soil?

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18 Root Mat that holds soil in place Plow Layer

19 Wetland soils contain organic material, exist with little oxygen, and have developed specialized ecosystems compared to upland areas.

20 Consider soils when selecting tree species to plant. Is soil well-drained or poorly drained? Black walnut does poor in wet areas.

21 Where are most of the tree roots? Most tree roots are found within the top 12 inches of soil

22 You are here! The old way.. Online Soil Survey

23 Mineral Cycling Pine forest slow turn around Hardwood forest faster turnaround

24 Faster recycling of nutrients in hardwood forests compared to pine. WHY?

25 Best Management Practices protects the root mat

26 Slope Position Are trees larger on the upper or lower slope?

27 Climate, soil, available water, and nutrients all affect how well a tree grows. If minimum requirements are not met, a tree may not grow in a given area.

28 Oaks are better adapted to dry and shallow hilltop soils, while yellow-poplar trees are found on more fertile lower slopes

29 Poor Site Good Site

30 Certain trees adapt to special conditions

31 Site Indicator Species

32 Aspect Direction the slope is facing north A B west east south

33 Solar Radiation What would the line look like for a south, north, and east facing slope? 6 a.m. Noon 6 p.m

34 South-facing Slope North-facing Slope Effect of Aspect on Site Quality

35 Quantity of biomass produced from an acre of woodland depends upon the site quality and is similar to farm crops.

36 Principles of Forest Ecology Site Quality Shade Tolerance Forest Succession Plant Competition Stand Development Role of Fire, Insect & Disease, and Herbivory,

37 Shade Tolerance is the ability of a plant to grow in the shade Intolerant Species - intolerant of shade and must have full sunlight to grow Tolerant Species - tolerant of shade does not require full sunlight to grow Intermediate tolerance - can grow in partial sunlight or shade

38 Tolerance, Sunlight, Growth D B H 0% 50% 100% Percentage Sunlight

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41 Intermediate tolerance trees that can establish themselves in the understory, but require full sunlight to mature -- Oak in this example

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43 Tolerance of Common Forest Trees Intolerant Intermediate Tolerant Full Sun Full Shade Virginia pine White pine Hemlock Loblolly pine Hickories Beech Yellow-poplar Yellow & bl birch Sugar maple Scarlet & black oak White & red oak Red maple Black walnut Chestnut oak Silver maple Green ash Red oak Basswood Red cedar White ash American holly Grey birch

44 Principles of Forest Ecology Site Quality Shade Tolerance Forest Succession Plant Competition Stand Development Role of Fire, Insect & Disease, and Herbivory,

45 Forest Succession Predictable changes in plant communities as the competing organisms respond to and modify the environment. Principle: All natural areas change over time, whether or not you do anything to them.

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47 Five Stages of Secondary Forest Succession

48 Stage 1 Herbaceous species

49 Stage 2 - Old Field

50 Stage 2 - Old Field of red cedar and goldenrod. It may be beneficial to maintain old field habitats by cutting down invading trees, which can maintain a diversity of habitats on the property.

51 Honeysuckle Grapevine Invasive and natural species can take over Kudzu

52 Old field red cedar being overtopped by shade intolerant tree species (yellow-poplar in this case).

53 Stage 3 Tree crowns close, sunlight disappears, resulting in dieback of ground vegetation. Poor wildlife value for this stage of succession.

54 Stage 4

55 Stage 5 Old Growth

56 Early Successional Species Vary by Region

57 Forest succession is the progression of plant communities that begins with shade intolerant plants and ends up with shade tolerant plants.

58 Virginia Pine early successional forest common on poor soils.

59 Example of an early successional Virginia pine forest that is dying. Beech trees (a late successional species) have established themselves in the understory and will form the new forest.

60 Tree Planting-- Pushing succession ahead

61 Forest Harvesting: Effect on Succession?

62 Important Role of Native Species Native plants and insects have developed evolutionary relationships. Caterpillars & insects provide protein sources for birds and mammals Number of lepidopteran species Native Woody Non-Native Woody

63 Forest succession & wildlife habitat

64 Principles of Forest Ecology Site Quality Shade Tolerance Forest Succession Plant Competition Stand Development Role of Fire, Insect & Disease, and Herbivory,

65 What Do Plants Compete For? Light Water Nutrients

66 Are these trees different ages?

67 Is tree size a reliable indicator of tree age? Why?

68 Tree is a factory... Leaves use sun and water to produce food... More leaves More food More diameter growth...

69 The dominance of a tree refers to the position of its crown relative to other trees in the canopy. In even-aged forests, the more dominant trees have won the competition for light.

70 Forest Thinning - improve growth & species composition, not regeneration

71 Leaves use sun and water to produce food years - More leaves - More food - More diameter growth years

72 Live crown ratio (LCR) is the ratio of the foliage canopy to the total height of the tree. - Hardwood 5065% - Pine 70-90%

73 Epicormic Branching As buds under bark are exposed to sunlight, they grow and form new branches on the tree bole and can reduce quality. Do not open the forest canopy too much.

74 Leaving the proper stocking produces better growth and little epicormic branching. Picture: woodland after a sustainable harvest.

75 Unsustainable harvest removed dominant and best trees and left the rest. They go by the names of diameter-limit cutting, selection harvest and high-grading. This amounts to starting over.

76 Principles of Forest Ecology Site Quality Shade Tolerance Forest Succession Plant Competition Stand Development Role of Fire, Insect & Disease, and Herbivory,

77 Regeneration is the key: Different species have different regeneration strategies

78 Some species like yellow-poplar, ash and maple need bare soil to germinate seeds

79 Slow and steady Heavy seeded species: * Oak * Hickory * Walnut

80 Stump sprouts from cut hardwood stumps are the most vigorous source of hardwood forest regeneration. Stump sprouting reduces with stump diameter

81 If stumps are cut low, sprouts from the root collar will grow into quality trees (right).

82 Stand Development: Tree Density increases over time Year 1: 10,000 stems/ac Year 15: 1,000 stems/ac

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84 Volume Growth Per Tree or Acre is Controlled by Tree Density (or Stocking)! Well spaced trees optimize volume growth

85 We measure the density or stocking of the forest using basal area? Basal area is the sum of the cross-sectional area of tree stems 4.5 feet above the ground

86 BA in a Few Big Trees or Many Smaller Trees

87 Development of vertical stratification as trees die, holes are filled, others seed in.

88 Stand Development A function primarily of site quality Past history current practices (grazing, for example) species composition A photographic history from the Allegheny Plateau in Pennsylvania ( )

89 1927

90 1928

91 1937

92 1947

93 1958

94 1968

95 1978

96 1998

97 Forests are resilient

98 60 years later

99 Principles of Forest Ecology Site Quality Shade Tolerance Forest Succession Plant Competition Stand Development Role of Fire, Insect & Disease, and Herbivory,

100 Smokey Bear Changed the Landscape Fewer low intensity fires Buildup of fuel in understory larger crown fires result Oak-hickory species lost ecological advantage

101 Fire releases nutrients, renews, and favors certain tree species Fire ecology differs by region Apples n oranges

102 Chestnut Blight changed the forest in the span of a few years in the late 1920 s.

103 Emerald Ash Borer will kill all ash trees Gypsy moths continue to be a periodic problem.

104 Major disturbances, such as hurricanes, tornadoes, and wind storms.

105 Other Disturbances Southern pine beetle Invasive species Deer browsing

106 City of Baltimore, Reservoir Forests Example: intense deer browse leads to the disruption of ecological processes No seedling regeneration in the majority of understory plots Prettyboy.. 84% Liberty.. 74% Loch Raven.. 63%

107 Deer overabundance negatively impacts forest regeneration and wildlife habitat for other species. Forest birds that used to be next in the ground vegetation are no longer found.

108 Principles of Forest Ecology Site Quality Shade Tolerance Forest Succession Plant Competition Stand Development Role of Fire, Insect & Disease, and Herbivory, How do we put all this together to make recommendations for management activities?

109 What History Are You Writing?