Skip to Main Content
Forest health monitoring in the Ngangao Forest, Taita Tills, Kenya: A five year assessment of changeAuthor(s): Paul C. Rogers; Barbara O'Connell; James Mwang'ombe; Seif Madoffe; Gerard Hertel
Source: Journal of East African Natural History 97(1): 3-17
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
PDF: Download Publication (288.63 KB)
DescriptionForest Health Monitoring (FHM) provides a standardized detection-level survey of forest and tree characteristics for large forested areas. We have adopted FHM methods from this temperate-based program to tropical forests in the Eastern Arc Mountains (EAM) of Kenya and Tanzania. This paper reports the first assessment of trend data in the EAM over a period from 2001 to 2006. Growth and diversity statistics are presented for 11 forest plots in Ngangao Forest; only six (of 45) species constitute the predominance (68%) of basal area growth. Four endemic trees were tallied in our survey: Dasylepis integra, Leptonychia usambarensis, Macaranga conglomerata, and Polyscias stuhlmannii. We contrast diversity statistics with the nearby Chawia Forest and confirm the basic principal of species area relationships. Additionally, we examine visual crown assessments and tree damages. Tree crowns appeared healthy overall, although one species (Albizia gummifera) displayed increased dieback and foliage transparency and decreased crown density. Tree damages increased slightly over the survey period with stem decays constituting the most prominent symptom. Overall, we found no significant change in this first remeasurement of forest conditions at Ngangao Forest. The results reported here, however, may require more intense inspection of conditions. The Forest Health Monitoring approach constitutes a detection-level survey; it is dependent on follow-up by local experts to determine more precise causality where initial problems are found.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- 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.
CitationRogers, Paul C.; O''Connell, Barbara; Mwang''ombe, James; Madoffe, Seif; Hertel, Gerard. 2008. Forest health monitoring in the Ngangao Forest, Taita Tills, Kenya: A five year assessment of change. Journal of East African Natural History 97(1): 3-17
KeywordsEastern Arc Mountains, change assessment, biodiversity, crown conditions, tree damage
- Forest health monitoring: national status, trends, and analysis 2017
- Forest health monitoring: 2001 national technical report
- Crown-condition classification: a guide to data collection and analysis
XML: View XML