%0 Journal Article
%T Understory plant diversity assessment of Szemao pine (Pinus kesiya var. langbianensis) plantations in Yunnan, China
%A Wang
%A H. F.
%A Lencinas
%A M. V.
%A Ross Friedman
%A C.
%A Zhu
%A Z. X.
%J Collectanea Botanica
%D 2012
%I Consejo Superior de Investigaciones Cient赤ficas
%X Sustainability is a key objective for managers of both natural forests and plantations, and biodiversity assessments are important tools to improve conservation of endangered species. Szemao pine (Pinus kesiya var. langbianensis) is a native Chinese tree species used in plantations. This study evaluated differences in understory diversity among Szemao pine plantations (SP) and other local current vegetation types: secondary evergreen forests (SE) and abandoned farmlands (AF) in Yunnan Province. Sampling was performed at three elevation ranges, where species richness, species cover, and environmental variables in the herb and shrub layers were measured. We found that indexes for average richness and Shannon每Wiener diversity were higher in SE than in SP, which were in turn higher than in AF, while the index for evenness was higher in SP. These indexes increased with elevation in SP and AF, but were higher at low and medium elevations in SE. Inclusion of environmental factors highlighted elevation differences, with water content (at herb layer) and soil type (at shrub layer) being the most significant variables. In conclusion, plantations of Szemao pine negatively affect understory diversity in Yunnan, and furthermore, only a few rare or threatened species could be found in the plantations. Nature reserves and transplanting could protect threatened species if established before plantations. La sostenibilidad es un objetivo clave para la gesti車n tanto de bosques naturales como de plantaciones, mientras que los estudios sobre biodiversidad constituyen herramientas muy 迆tiles para mejorar la conservaci車n de especies amenazadas. El pino Szemao (Pinus kesiya var. langbianensis) es un 芍rbol nativo de China que se usa en plantaciones. Este estudio eval迆a la diversidad del sotobosque en plantaciones de pino Szemao (SP) y otros tipos de vegetaci車n local, como bosques secundarios perennifolios (SE) y tierras de cultivo abandonadas (AF), en la provincia de Yunnan, China. El muestreo se realiz車 en tres rangos altitudinales, y se evalu車 riqueza y cobertura de hierbas y arbustos adem芍s de factores ambientales. En general, la riqueza promedio y la diversidad de Shannon-Wiener fueron mayores en SE que en SP, y a su vez que en AF, mientras que la equitatividad tendi車 a ser mayor en SP. Asimismo, dichos 赤ndices tendieron a aumentar con la altitud en SP y AF, aunque en SE fueron mayores a altitudes bajas y medias. La inclusi車n de factores ambientales resalt車 las diferencias entre rangos altitudinales, siendo el contenido de agua (en el estrato herb芍ceo) y el tipo de suelo (e
%K abandoned farmlands
%K endangered species
%K herbs
%K plant diversity
%K secondary evergreen forests
%K shrubs
%K arbustos
%K bosques secundarios perennifolios
%K diversidad de plantas
%K especies amenazadas
%K hierbas
%K tierras de cultivo abandonadas
%U http://collectaneabotanica.revistas.csic.es/index.php/collectaneabotanica/article/view/197/199