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Management impacts and remote sensin...

Thoma, David Patrick.

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Management impacts and remote sensing applications for water quality assessment.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Management impacts and remote sensing applications for water quality assessment./
作者:	Thoma, David Patrick.
面頁冊數:	135 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0610.
Contained By:	Dissertation Abstracts International64-02B.
標題:	Environmental Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3080128

Management impacts and remote sensing applications for water quality assessment.
Thoma, David Patrick.

Management impacts and remote sensing applications for water quality assessment. - 135 p.

Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0610.

Thesis (Ph.D.)--University of Minnesota, 2003.

This research, consisting of three parts, was designed to improve understanding of non-point pollution sources in the Minnesota River Basin and how adoption of conservation tillage practice (chisel plow with about 30% residue cover) might affect non-point source pollution and crop yield from relatively flat lands in the Minnesota River Basin. The first part was a plot experiment at Lamberton, MN that tested the water quality impacts of two tillage (moldboard vs. chisel) systems, and two nutrient source (liquid hog manure vs. urea) treatments. Four years of natural surface runoff and tile drainage showed few significant differences in water quality parameters from these relatively flat plots. Annual average sediment loss from the plots was 1260 kg/ha with 1.4 kg/ha and 0.13 kg/ha associated total and dissolved P loss respectively. Annual average NO<sub>3</sub>-N losses through tile drainage were 9.1 kg/ha. Average annual corn grain yield was reduced by 0.4 Mg/ha in the four-year average yield under the chisel system. The second project investigated remote sensing and the Tillage Transect Survey (TTS) accuracy for measuring crop residue cover. When residues were grouped into 5 cover categories the TTS accuracy (49%) outperformed all models (best model = 39%), but models performed as good or better (up to 80%) than the TTS when only two cover categories were used. The third project used airborne scanning laser altimetry to determine mass wasting of bank materials from the Blue Earth River. For the time between the April 2000 and April 2001 scans, between 23 and 56% of the sediment transported by the river had its source from bank collapse and erosion. For the same period, total P contribution from riverbank erosion was 201 t.Subjects--Topical Terms:

676987
Environmental Sciences.

Management impacts and remote sensing applications for water quality assessment.
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502 $a Thesis (Ph.D.)--University of Minnesota, 2003.
520 $a This research, consisting of three parts, was designed to improve understanding of non-point pollution sources in the Minnesota River Basin and how adoption of conservation tillage practice (chisel plow with about 30% residue cover) might affect non-point source pollution and crop yield from relatively flat lands in the Minnesota River Basin. The first part was a plot experiment at Lamberton, MN that tested the water quality impacts of two tillage (moldboard vs. chisel) systems, and two nutrient source (liquid hog manure vs. urea) treatments. Four years of natural surface runoff and tile drainage showed few significant differences in water quality parameters from these relatively flat plots. Annual average sediment loss from the plots was 1260 kg/ha with 1.4 kg/ha and 0.13 kg/ha associated total and dissolved P loss respectively. Annual average NO<sub>3</sub>-N losses through tile drainage were 9.1 kg/ha. Average annual corn grain yield was reduced by 0.4 Mg/ha in the four-year average yield under the chisel system. The second project investigated remote sensing and the Tillage Transect Survey (TTS) accuracy for measuring crop residue cover. When residues were grouped into 5 cover categories the TTS accuracy (49%) outperformed all models (best model = 39%), but models performed as good or better (up to 80%) than the TTS when only two cover categories were used. The third project used airborne scanning laser altimetry to determine mass wasting of bank materials from the Blue Earth River. For the time between the April 2000 and April 2001 scans, between 23 and 56% of the sediment transported by the river had its source from bank collapse and erosion. For the same period, total P contribution from riverbank erosion was 201 t.
590 $a School code: 0130.
650 4 $a Environmental Sciences. $3 676987
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Hydrology. $3 545716
650 4 $a Remote Sensing. $3 1018559
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