摘要
在鼎湖山南亚热带常绿阔叶林中,植物叶片营养元素含量为:N 0.946%一2.535%,P 0.030%—0.127%, K 0.614%—1.833%, Ca 0.442%—1.995%, Mg 0.024%—0.188%。叶片各营养 养元素间相关性较差,仅P与Mg及Mg与K之间存在显著的线性相关。叶片N元素平均含量在各层 中的序列为:乔木Ⅲ>乔木Ⅱ>乔木Ⅰ>灌木>藤本>草本;其它营养元素浓度随层次分配的规律 性不甚明显,但总趋势为乔木层植物略低于其它层植物。不同营养元素平均含量在各器官中的大小排列 顺序为:N叶>皮>枝>根>干;P叶>枝>根>皮>干;K叶>枝>皮>根>干;Ca 皮>叶>枝>根>干; Mg叶>根>皮>枝>干。大部分植物在同一器官中各营养元素平均含 量序列为:叶、枝和根中均为N>Ca>K>Mg>P;干K>Ca>N>Mg>P;皮Ca>N>K>Mg>P。 对元素含量分配格局分析表明,P和Mg很可能是限制南亚热带常绿阔叶林植物生产力的最重要营养元 素。
The investigation of plant nutrient contents in Dinghushan lower subtropical evergreen broad-leaved forest was carried out in August 1996. Sampling was made in Dinghushan Biosphere Reserve, Guangdong, from tree, shrub, liana and herb layers with 5-8 representative species each. It was shown that the nutrient contents in leaves of all plants were N 0.946% - 2.535%, P 0.030% - 0. 127%, K 0.614% - 1 .833%, Ca 0.442% - 1 .995% and Mg 0.024% - 0.188%. Average contents of nutrient elements in various organs and at different layers in the forest were varied. Average nutrient content of N was highest in leaves, and in descending order in barks, branches, root and stems, other elements: P in leaves > branches > roots > barks >stems; K in leaves > branches > barks > roots > stems, Ca in barks > leaves > branches > roots >stems, Mg in leaves > stems > roots > barks > branches. The distribution of elements in most plants was as follows f N>Ca >K>Mg>P in leaves, branches and roots, K>Ca >N>Mg >P in stems, and Ca >N>K>Mg >P in barks. The factors, especially P and Mg, possibly limiting the plant productivity in the area studied are discussed.
出处
《热带亚热带植物学报》
CAS
CSCD
2000年第3期198-206,共9页
Journal of Tropical and Subtropical Botany
基金
国家自然科学基金!(39899370)
关键词
南亚热带
常绿阔叶林
营养元素含量
分配格局
Lower subtropical evergreen broadleaf forest, Dinghushan, Nutrient content, Distribution pattern