摘要
利用外带鱼眼镜头的数码相机获得长白落叶松(Larix olgensis)林型的半球面影像,用Gap Light Analyzer软件处理分析后获得叶面积指数、林冠开阔度和林下光照因子等一系列参数,揭示了辽东山区长白落叶松的叶面积指数和林冠开阔度的月动态特征。结果表明,长白落叶松随着生长季的到来叶面积指数呈快速增长的趋势,最大值出现在6月份,7—9月份开始缓慢下降,10月份下降显著,最小值在春季4月份;林冠开阔度随着生长季的到来而下降,其最小值出现在6月份,之后开始缓慢增加,10月份骤然增加,最大值在春季4月份。叶面积指数和林冠开阔度相关显著,并且呈现指数回归的关系。
The hemispherical photographs of Larix olgensis forest in Qingyuan Experimental Station of Forest Ecology in Liaoning Province were obtained by use of digital camera with a fisheye lens. A series of parameters, such as leaf area index, crown gap fraction and sunshine under forest canopy, were analyzed by Gap Light Analyzer software in order to reveal their monthly changes. Results dedicated that leaf area index of L. olgensis increased rapidly during the growth season and reached the maximum value in June, then decreased slowly during July, October and September and decreased markedly in October, and reached the minimum value in the next April. Canopy openness decreased during the growth season and reached the minimum value in June, then increased slowly and dramatically increased in October, and the maximum value appeared in the next April. The leaf area index had significant correlation with crown canopy openness, and it followed an exponential regression relationship.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2009年第7期20-22,共3页
Journal of Northeast Forestry University
基金
国家自然科学基金项目(30571479
30830085)
辽宁省自然科学基金项目(落叶松20050724)资助
