NDLI: Agroforestry and grass buffer effects on water quality in grazed pastures

Content Provider	Springer Nature Link
Author	Udawatta, Ranjith P. Garrett, Harold E. Kallenbach, Robert L.
Copyright Year	2010
Abstract	Conservation practices including agroforestry and grass buffers are believed to reduce nonpoint source pollution (NPSP) from pastured watersheds. Agroforestry, a land management practice that intersperses agricultural crops with trees, has recently received increased attention in the temperate zone due to its environmental and economic benefits. However, studies are limited that have examined buffer effects on the quality of water from grazed pastures. Six treatment areas, two with agroforestry buffers, two with grass buffers, and two control treatments were used to test the hypothesis that agroforestry and grass buffers can be used to effectively reduce NPSP from pastured watersheds. Vegetation in grass buffer and pasture areas includes red clover (Trifolium pretense L.) and lespedeza (Kummerowia stipulacea Maxim.) planted into fescue (Festuca arundinacea Schreb.). Eastern cottonwood trees (Populus deltoides Bortr. ex Marsh.) were planted into fescue in agroforestry buffers. Soils at the site are mostly Menfro silt loam (fine-silty, mixed, superactive, mesic Typic Hapludalfs). Treatments were instrumented with two-foot H flumes, water samplers, and flow measuring devices in 2001. Composite water samples were analyzed for sediment and total nitrogen after each runoff event to compare treatment differences. Treatments with agroforestry and grass buffers had significantly lower runoff volumes as compared to the control. The loss of sediment and total nitrogen were smaller for the buffered treatments. The results of this study suggest that establishment of agroforestry and grass buffers help reduce NPSP pollution from pastured watersheds. It is anticipated as trees grow and roots occupy more soil volume, the reduction in N in runoff will increase on the agroforestry watershed.
Starting Page	81
Ending Page	87
Page Count	7
File Format	PDF
ISSN	01674366
Journal	Agroforestry Systems
Volume Number	79
Issue Number	1
e-ISSN	15729680
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-02-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	HARC Menfro soil Nitrogen Phosphorus Runoff Sediment Agriculture Forestry
Content Type	Text
Resource Type	Article
Subject	Forestry Agronomy and Crop Science

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