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Rill erosion by concentrated flow as...

Mamo, Mitiku.

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Rill erosion by concentrated flow as influenced by live plant roots.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Rill erosion by concentrated flow as influenced by live plant roots./
作者:	Mamo, Mitiku.
面頁冊數:	208 p.
附註:	Source: Dissertation Abstracts International, Volume: 59-09, Section: B, page: 4945.
Contained By:	Dissertation Abstracts International59-09B.
標題:	Engineering, Agricultural. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9839358
ISBN:	0599039825

Rill erosion by concentrated flow as influenced by live plant roots.
Mamo, Mitiku.

Rill erosion by concentrated flow as influenced by live plant roots. - 208 p.

Source: Dissertation Abstracts International, Volume: 59-09, Section: B, page: 4945.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 1998.

Most erosion studies have been conducted on fresh-tilled or disturbed soils which may not represent erosion from soils that are planted or left to fallow. If erosion is to be predicted for soils under different crops and at different times during the growing period, there is a need to investigate the effect of living plant roots on erosion by concentrated flow.

ISBN: 0599039825Subjects--Topical Terms:

1019504
Engineering, Agricultural.

Rill erosion by concentrated flow as influenced by live plant roots.
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245 1 0 $a Rill erosion by concentrated flow as influenced by live plant roots.
300 $a 208 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-09, Section: B, page: 4945.
500 $a Supervisor: Gary D. Bubenzer.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 1998.
520 $a Most erosion studies have been conducted on fresh-tilled or disturbed soils which may not represent erosion from soils that are planted or left to fallow. If erosion is to be predicted for soils under different crops and at different times during the growing period, there is a need to investigate the effect of living plant roots on erosion by concentrated flow.
520 $a Field and laboratory experiments were conducted on Plano silt loam soil (17.6% sand, 60.5% silt, and 21.9% clay) to study the effects of living roots on rill erosion by concentrated flow. Corn and soybean were used for the field experiment while ryegrass was used in the laboratory experiments. The crops were grown for three time periods and erosion from these plots compared with fresh-tilled and fallow controls. Pre-formed channels for field and a flume for laboratory were used to simulate concentrated flow. To vary the range of hydraulic shear stress, inflow was added at nominal rates of 7.57, 15.14, 22.71, 30.28, and 37.85 l min $\ sp{-1} $.
520 $a For both field and laboratory studies, soil detachment and soil erodibility decreased with stage and time since tillage. Soil detachment averaged over the entire inflow rates and the three stage was observed to be 3, 6, and 5.7 times greater for fresh-tilled than for fallow, corn, and soybean plots respectively. Even though average root length density for corn was 3.6 times more than that for soybean, no significant difference was observed between average detachment rate values from the two treatments (1.6 g s $\ sp{-1} $ m $\ sp{-2} $ for corn versus 1.66 g s $\ sp{-1} $ m $\ sp{-2} $ for soybean).
520 $a Soil erodibility ( $) values for fallow plots were 2.3, 1.9, and 2.4 times those fur corn plots at stages of V6, V10, and anthesis respectively and 2.8, 2.2, and 1.9 times those for soybean plots at stages V3, V6, and flowering respectively. For laboratory experiment I, $ values for ryegrass samples were reduced to 29, 27, and 29% of that for fallow samples at stages I, II, and III. For the less rooted and shorter duration laboratory experiment II, $ for ryegrass samples were reduced to 92, 91, and 68% of those values for fallow samples.
520 $a Stepwise linear regression was performed on measured soil, hydraulic, and root parameters to develop predictive equations for detachment rates ( $) and $. For field experiment, root length density, channel slope, dry bulk density, and after erosion test strength measurements were all negatively correlated to $ and $. Root length density was also negatively correlated to D $\ sb{r} $ and $ for both laboratory experiments. Before erosion test strength measurements were not consistently correlated to rill erosion.
590 $a School code: 0262.
650 4 $a Engineering, Agricultural. $3 1019504
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Engineering, Civil. $3 783781
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710 2 0 $a The University of Wisconsin - Madison. $3 626640
773 0 $t Dissertation Abstracts International $g 59-09B.
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790 $a 0262
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9839358