Skip to Main Content
Due to a lapse in federal funding, this USDA website will not be actively updated. Once funding has been reestablished, online operations will continue.
Long-term residual dry matter mapping for monitoring California hardwood rangelandsAuthor(s): Norman R. Harris; William E. Frost; Neil K. McDougald; Melvin R. George; Donald L. Nielsen
Source: In: Standiford, Richard B., et al, tech. editor. Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in California's Challenging Landscape. Gen. Tech. Rep. PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 87-96
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: View PDF (490 KB)
DescriptionLong-term residual dry matter mapping on the San Joaquin Experimental Range provides a working example of this monitoring technique for grazing management and research. Residual dry matter (RDM) is the amount of old plant material left on the ground at the beginning of a new growing season. RDM indicates the previous season’s use and can be used to describe the health or condition of annual rangelands. An RDM evaluation is made before the first effective fall rains, usually in late September or early October. Direct clipping and weighing, comparative yields, or photo standards are used to obtain RDM estimates. Mapping of RDM provides a means of recording the total amount of herbage remaining, as well as its distribution on the landscape. RDM is mapped on three different range sites at low, moderate, and high amounts: 1) flat slopes and swales: <400, 600 and >800 lbs/acre; 2) gentle rolling slopes: <600, 800 and >1,000 lbs/acre; and 3) steep slopes: <800, 1,000, and >1,200 lbs/acre. Tracking this information assists management in adjusting stocking rates, selecting locations for livestock supplements and evaluating grazing systems. Researchers can evaluate different grazing impacts on sites, evaluate grazing models, and have a clear understanding of ambient grazing prior to experimentation.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationHarris, Norman R.; Frost, William E.; McDougald, Neil K.; George, Melvin R.; Nielsen, Donald L. 2002. Long-term residual dry matter mapping for monitoring California hardwood rangelands. In: Standiford, Richard B., et al, tech. editor. Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in California''s Challenging Landscape. Gen. Tech. Rep. PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 87-96
- Factors influencing soil-surface bulk density on oak savanna rangeland in the southern Sierra Nevada foothills
- Use of Supplemental Feeding Locations to Manage Cattle Use on Riparian Areas of Hardwood Rangelands
- Fourteen years of forage monitoring on the California Central Coast shows tremendous variation
XML: View XML