What We're Measuring

curious trends: other grasses and agriculture grows
 

Curious Trends: Other Grasses and Agriculture Class Grows

Explanation

Many of us would expect to see a decrease in agricultural area over the 17-year time period. Most of us have witnessed farm fields that are occupied by houses. But remember, this is a land cover map not a land use map. A land cover map only describes what is seen from space, not how that land is being used. Thus, to our satellite sensors there is little to distinguish between farmland and other grassy and shrubby areas. Grassy areas, as seen from space, can have many uses including agriculture, meadows, unmowed herbaceous plants along roads, or cleared forested areas that are now growing grass. Although some grassy areas (including agricultural) are being converted to developed land, a large amount of forest has been cleared, resulting in extensive new grassy and shrubby areas (many a precursor to development).

Examples

Loss of Other Grasses and Agriculture and Gain of Turf and Grass as New Homes and Lawns are Built (South Windsor/Vernon, CT)

New Golf Course Results in Loss of Other Grasses and Agriculture and Gain of Turf and Grass (East Haddam, CT)

Gain of Other Grasses and Agriculture Due to Forest Clearing (Colchester, CT)

Gain of Other Grasses and Agriculture Due to New Development (Salem, CT)

Summary Table of Other Grasses and Agriculture Gains and Losses

Take Home Message. There has been a significant increase in the other grasses and agriculture class. Most of the increase came at the expense of forest. Conversion from the turf and grass and wetland classes to the other grasses and agriculture class also contributed to the increase. Although other grasses and agriculture has increased overall, quite a bit has been converted to developed as well as barren.

Gains and Losses of Grasses and Agriculture in Connecticut for each time period below. All values are in acres.
 
1985-1990
1990-1995
1995-2002
 
change from other grasses
change to other grasses
Net gain or loss
change from other grasses
change to other grasses
Net gain or loss
change from other grasses
change to other grasses
Net gain or loss
Developed
3760
10
-3750
1742
19
-1723
3444
3
-3441
Turf and Grass
876
1432
606
282
647
365
375
1154
779
Other Grasses
347011
347011
359491
359491
365861
365861
Forest*
455
13184
12729
450
9753
9303
102
12582
12479
Water
431
233
-198
148
413
265
465
292
-173
Wetland**
100
829
728
54
589
534
96
809
713
Barren
1041
111
-930
642
200
-441
942
28
-914
TOTAL
353625
362809
9184
362809
37112
8303
371286
380729
9442

* Deciduous forest and coniferous forest have been combined.
** Non-forested wetlands, forested wetlands and tidal wetlands have been combined.

First Column "1985-1990 change from other grasses". The area, in acres, that was other grasses and agriculture in 1985 (or the first date in the time period) and changed to a different landcover by 1990 (or the second date). The different landcover coincides with the landcover class in the first column.

Second Column "1985-1990 change to other grasses". The area, in acres, that was something other than other grasses and agriculture (as indicated by the class in the left column) in 1985 (or the first date) and changed to other grasses and agriculture by 1990 (or the second date).

Net gain or loss = red (negative). More other grasses and agriculture was lost to a class than was gained from that class. For example, between 1985 and 1990, 3760 acres was changed from other grasses and agriculture to developed compared to only 6 acres changing from developed to other grasses and agriculture resulting in a net loss of other grasses and agriculture.

Net gain or loss = black (positive). More other grasses and agriculture was gained from a class than was lost to that class. For example, between 1985 and 1990, only 455 acres were changed from other grasses and agriculture to forest compared to a whopping 13184 acres that went from forest to other grasses and agriculture resulting in a net increase of other grasses and agriculture.


Do you see a trend that we haven't mentioned? Email us. We'd like to know about it.

 

Comments or Suggestions? Email us at clear@uconn.edu.

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