Growth Situation And With The Relationships Between Habitat Factors Of Keteleeria Cyclolepis Plantation In Guangxi Province

To analyze and identify the relationship between the growth of plantation and the environmental factors is of great practical significance for the rational management of plantation. This study took Keteleeria cyclolepis plantation in six sites of Guangxi as research objects, and the data was obtained by setting up temporary sample site and consulting document. The data was arranged with Excel, and variance and check analysis was carried out with SPSS 19.0 software. By adopting the notions proposed by J.T. Curtis and R.P. Mcintosh, three sets of relationship, namely between growth and geographical factors, between growth and meteorological factors, between biodiversity and habitat factors of Keteleeria cyclolepis plantation in six sites of Guangxi were discussed respectively. The results are as follows:(1) Survey on the sample sites within Keteleeria cyclolepis plantation in six locations of Guangxi was carried out to select five superior individual plants by DBH, tree height and canopy. Individual tree volume, yearly-average DBH, tree height and individual volume growth were calculated to identify the impacts of different slop aspects, positions and grades on the growth of Keteleeria cyclolepis plantation. The results were:the difference between growth of Keteleeria cyclolepis plantation and slop aspect/grade was not significant. Keteleeria cyclolepis plantation grew well on meso-slope and down grade, but not the case on upslope.(2) By adopting simple correlation and partial correlation methods, the relationships between mean DBH, mean tree height and yearly average volume of Keteleeria cyclolepis plantation and meteorological factors were analyzed to study the main meteorological elements which restrained the growth of Keteleeria cyclolepis. The results were:during the whole growth process of Keteleeria cyclolepis, meteorological factors had little impacts on its growth. Among the eight meteorological factors, annual sunshine hours and annual evaporation had relatively close and positive correlation with the growth of Keteleeria cyclolepis, followed by annual mean temperature and the hottest month temperature, while the coldest month temperature and humidity had the least correlation. Each meteorological factor had relatively great impacts on tree height but relatively small impacts on DBH. After comprehensive analysis it was found out that Keteleeria cyclolepis preferred high temperature and evaporation in summer and autumn. Keteleeria cyclolepis having negative relationship with annual rainfall indicated to a certain extent that the species had relatively high adaptability to soil and water conditions in forestland.(3) Impacts of different habitat factors on biodiversity of Keteleeria cyclolepis plantation in six sites were analyzed with the following results:species of shrub layer were richer than the species of herb layer under the Keteleeria cyclolepis plantation. Shanor-wiener index (H') and simpson index (D) of shrub layer were remarkably higher than that of herb layer. However, pielou index (J) of herb layer (0.771?0.994) was wider than that of shrub layer (0.841?0.945). Small arbor had more associated species whose types were greatly determined by the origin of forestland. Different canopy degrees slop grades, aspects and positions exerted different impacts on vegetation diversity. Species richness decreased as canopy degree increased. Vegetation richness of shrub on sunny slop was higher than that on shady slop. Shanor-wiener index (H') and simpson index (D) on flat slope were wider than that on steep slope, while the indexes on middle slope position were narrower than that on uphill position and downhill position.