Exam (elaborations)
NREM 120 EXAM 3 | Questions And Answers Latest {} A+ Graded | 100% Verified
- Course
- Institution
NREM 120 EXAM 3 | Questions And Answers Latest {} A+ Graded | 100% Verified
[Show more]
Content preview
NREM 120 EXAM 3 | Questions And Answers Latest {2024- 2025} A+ Graded | 100%Verified
Grasslands - - Grasses with some forbs
- areas free of trees
- between 10-30" rainfall
- most productive grazing areas
- once roamed by wild animals
- now plowed for ag or used for livestock grazing
grassland driving forces - seasonal dormancy, herbivores, fire, management
Grassland Biome - an area in almost every continent; evolved with large herbivores
other rangelands include: - - tropical savannas
- tundra
- desert shrublands
- many temperate forests, esp. conifer forests
rangland totals - World: 50% ice free land
USA: 29% total land area
North American Prairie - made of tall grass, mixed grasses, and short grasses
why is there an east to west shift from forest to tall grass to short grass prairie? - influence of the Gulf of
Mexico causing a moisture gradient
metabolic reserve - what needs to be left behind to make grazing sustainable
,basal zone - lowermost portion of the leaf; as long as leaf is not eaten beyond basal zone, leaf will grow
to its original length
overgrazing - - the basal zone (MR) is grazed
- root reserves are not allowed to replenish between grazing events
- forage requires a period of rest
Grazing grass regrowth appears within ___ - 7 days
_____ weakens the _____ plant community - overgrazing; dormant
what happens when grasslands are overgrazed? - allows for increases in plant community deteriorating
and eventually invaders to move in
consequences of overgrazing - - reduced ground cover
> soil erosion
> wind erosion
> nutrient runoff
>gully formation
- deteriorating plant community
- desertification
Homestead Act of 1862 - 160 acres of virtually free land to American citizens or soon-to-be citizens
between west of the Mississippi
John Wesley Powell - - concerned about the 160 acre parcel size out west
- report on lands of the arid region 1878
- recommends grazing 2,500 acre parcels
, In what years was the western rangeland seriously degraded? - 1860-1930
Tallgrass parairie current status - - large animals usually lost
- small animals, like the Karner Blue butterflies, struggling due to habitat loss AND fragmentation
Grassland bird status - birds that nest in grass structures or on the gound
- drastic long-term population decliens
> decreasing plasture acres
> earlier alfalfa harvests
> removal of fencerows
> increased homogeneity of crop uses
Currents status of the short grass pairaie - - suffered badly from overgrazing, 1860-1940, and from
doughts
- situation slowly impoving on most areas
why does the short grass pairie recover so slowly? - lack of moisture
years after Powell's 1878 Report - - western rangeland seriously degraded
- Forest Service formed
- Taylor Grazing Control Act
- BLM authority
- Conservation Reserve Program
US Forest Service - created in 1905 by the Roosevelt administration to manage the forest lands set aside
as National Forest.
after the Powell Report:
- restrict cattle stocking rates
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller oneclass. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.48. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79271 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now