Study on the Biological Productivity Effects of Thinning Middle-Aged Forest for Michelia macclurei Dandy in the Coastal Mountainous Areas of Southern Fujian
In order to improve the quality and ecological efficiency of artificial ecological forests of Michelia mac-clurei in the coastal mountains of southern Fujian,experiments were conducted on middle-aged forests of Michelia macclurei Dandy with different thinning intensities.From the perspective of ecological protection efficiency,the effects of different thinning intensities on middle-aged forests of Michelia macclurei Dandy were analyzed and ex-plored using stand biological productivity as the evaluation index.The results showed that proper thinning can significantly promote the growth and development of branches and leaves in middle-aged forests of Michelia mac-clurei Dandy,effectively changing the phenomenon of long and short crowns and small crown widths.The biolog-ical structure of the forest stands is significantly improved,which is conducive to enhancing ecological functions;The intensity of thinning has a significant impact on the productivity of middle-aged forest stands,but the aboveground biomass and biomass productivity of the forest stand do not increase with the increase of thinning intensity.Regardless of the slope position,moderate thinning had the highest biomass productivity,with the aboveground biomass productivity of the 4a thinning forest reaching 3.628～4.075 t/(hm2·a),an increase of 5.47％to 18.46％compared to the population average of thinning treatment.Based on the comparative analysis of biological productivity at different slope positions and thinning intensities,the optimal thinning intensity is mod-erate thinning,which accounts for 30％of the total number of thinning trees,while retaining a forest density of 1260 trees per hectare.
Michelia macclurei Dandybiological productivitynurturing and thinningcoastal mountainous areas of southern Fujian
万方数据
维普
