語系:
繁體中文
English
說明(常見問題)
回圖書館首頁
手機版館藏查詢
登入
回首頁
切換:
標籤
|
MARC模式
|
ISBD
Grazing management effects on sedime...
~
Nellesen, Shelly Lee.
FindBook
Google Book
Amazon
博客來
Grazing management effects on sediment and phosphorus losses from streambanks.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
Grazing management effects on sediment and phosphorus losses from streambanks./
作者:
Nellesen, Shelly Lee.
面頁冊數:
58 p.
附註:
Advisers: John L. Kovar; Michael L. Thompson.
Contained By:
Masters Abstracts International45-05.
標題:
Agriculture, Range Management. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1443115
Grazing management effects on sediment and phosphorus losses from streambanks.
Nellesen, Shelly Lee.
Grazing management effects on sediment and phosphorus losses from streambanks.
- 58 p.
Advisers: John L. Kovar; Michael L. Thompson.
Thesis (M.S.)--Iowa State University, 2007.
Agricultural lands are the leading cause of nonpoint-source pollution in the United States. Previous studies indicate that grazed lands can have more impact on sediment and phosphorus (P) losses to surface waters than cropland or other agricultural lands. The purpose of this research was to determine the effects of different grazing managements on streambank erosion and potential P losses. In 2004, three treatments, including rotational stocking, continuous stocking with limited stream access, and continuous stocking with full stream access were established in six adjacent pastures along Willow Creek at a research farm in Marshall County, Iowa. Erosion measurements were taken monthly from May to November in 2005 and 2006. Soil samples were collected, and total P, Mehlich III P, water-extractable P, and bulk density were analyzed by horizon with the intent of calculating the amount of P that potentially entered the stream at this site. Phosphorus levels did not vary significantly among treatments but were higher in the A horizons than in the C horizons. Although net erosion treatment differences were found in both years, these differences were not consistent and no trend emerged. Erosion/deposition activity was greatest in the continuous stocking with unrestricted access (CSU) treatment. In the four months that there 16 was a significant difference among treatments, the CSU treatment had the highest activity, denoting the most bank instability. The CSU treatment also had consistently higher potential and water-extractable P losses and movements (flux) than either the rotational stocking (RS) or the continuous stocking with restricted stream access (CSR) treatments. During the 2005 grazing season, the CSU treatment had a potential P loss of 24.2 g/m2 from the streambanks, as well as a flux of 86.3 g/m 2 in the system. In 2006, a much drier year, the CSU treatment had a potential P loss of 1.9 g/m2 and a P flux of 41.9 g/m 2 from the streambanks. Results from this study suggest that grazing management may have an effect on erosion/deposition activity, but did not have an effect on streambank erosion.Subjects--Topical Terms:
1022885
Agriculture, Range Management.
Grazing management effects on sediment and phosphorus losses from streambanks.
LDR
:03024nam 2200277 a 45
001
949228
005
20110525
008
110525s2007 ||||||||||||||||| ||eng d
035
$a
(UMI)AAI1443115
035
$a
AAI1443115
040
$a
UMI
$c
UMI
100
1
$a
Nellesen, Shelly Lee.
$3
1272606
245
1 0
$a
Grazing management effects on sediment and phosphorus losses from streambanks.
300
$a
58 p.
500
$a
Advisers: John L. Kovar; Michael L. Thompson.
500
$a
Source: Masters Abstracts International, Volume: 45-05, page: 2332.
502
$a
Thesis (M.S.)--Iowa State University, 2007.
520
$a
Agricultural lands are the leading cause of nonpoint-source pollution in the United States. Previous studies indicate that grazed lands can have more impact on sediment and phosphorus (P) losses to surface waters than cropland or other agricultural lands. The purpose of this research was to determine the effects of different grazing managements on streambank erosion and potential P losses. In 2004, three treatments, including rotational stocking, continuous stocking with limited stream access, and continuous stocking with full stream access were established in six adjacent pastures along Willow Creek at a research farm in Marshall County, Iowa. Erosion measurements were taken monthly from May to November in 2005 and 2006. Soil samples were collected, and total P, Mehlich III P, water-extractable P, and bulk density were analyzed by horizon with the intent of calculating the amount of P that potentially entered the stream at this site. Phosphorus levels did not vary significantly among treatments but were higher in the A horizons than in the C horizons. Although net erosion treatment differences were found in both years, these differences were not consistent and no trend emerged. Erosion/deposition activity was greatest in the continuous stocking with unrestricted access (CSU) treatment. In the four months that there 16 was a significant difference among treatments, the CSU treatment had the highest activity, denoting the most bank instability. The CSU treatment also had consistently higher potential and water-extractable P losses and movements (flux) than either the rotational stocking (RS) or the continuous stocking with restricted stream access (CSR) treatments. During the 2005 grazing season, the CSU treatment had a potential P loss of 24.2 g/m2 from the streambanks, as well as a flux of 86.3 g/m 2 in the system. In 2006, a much drier year, the CSU treatment had a potential P loss of 1.9 g/m2 and a P flux of 41.9 g/m 2 from the streambanks. Results from this study suggest that grazing management may have an effect on erosion/deposition activity, but did not have an effect on streambank erosion.
590
$a
School code: 0097.
650
4
$a
Agriculture, Range Management.
$3
1022885
650
4
$a
Agriculture, Soil Science.
$3
1017824
690
$a
0481
690
$a
0777
710
2
$a
Iowa State University.
$3
1017855
773
0
$t
Masters Abstracts International
$g
45-05.
790
$a
0097
790
1 0
$a
Kovar, John L.,
$e
advisor
790
1 0
$a
Thompson, Michael L.,
$e
advisor
791
$a
M.S.
792
$a
2007
856
4 0
$u
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1443115
筆 0 讀者評論
館藏地:
全部
電子資源
出版年:
卷號:
館藏
1 筆 • 頁數 1 •
1
條碼號
典藏地名稱
館藏流通類別
資料類型
索書號
使用類型
借閱狀態
預約狀態
備註欄
附件
W9116855
電子資源
11.線上閱覽_V
電子書
EB W9116855
一般使用(Normal)
在架
0
1 筆 • 頁數 1 •
1
多媒體
評論
新增評論
分享你的心得
Export
取書館
處理中
...
變更密碼
登入