鼎湖山季风常绿阔叶林黄果厚壳桂群落植物元素含量特征

研究鼎湖山南亚热带季风常绿阔叶林黄果厚壳桂群落元素含量特征 ,分析了其中 9个种不同器官的 6种元素含量 ,结果表明 :1 )群落中植物不同器官的元素含量大小为 ,N:叶 >皮 >根 >枝 >茎 ,P:叶 >枝、皮 >根 >茎 ,K:叶 >皮 >枝 >根 >茎 ,Ca:皮 >叶 >枝 >根 >,Mg:叶 >皮 >根 >枝 >茎。 2 )椎栗、黄果厚壳桂、鼎湖钓樟和双盖蕨是群落中含 N量较高的种 ;椎栗、云南银柴和双盖蕨含 P量较高 ;各个种的含 K量相似。 3)养分含量表现出一定的层次性差异 ,上层种叶子含 P量高于下层种 ,但含 K量区别不显著。上层种茎 N、P、K含量显著低于下层种。黄果厚壳桂种群 ,其不同层次个体养分含量没有统计上的显著差异 ,但下层个体茎养分高 ,上层个体茎养分低。 4)群落不同元素间具有许多显著相关的元素对 ,其中 N与其它元素的相关性最大 ,其次是 Mg、P,再次是 K,而 Na不与其它任何元素相关 ,Ca相关性很少。从器官角度看 ,茎所含相关元素对最多 ,而枝、皮最少。

THE ELEMENT CONTENT OF PLANTS IN CRYPTOCARYA CONCINNA COMMUNITY IN DINGHUSHAN EVERGREEN MONSOON BROAD LEAF FOREST

This paper reports the contents of 6 elements of 9 species in Dinghushan forest, including Schima superba, Castanopsis chinensis, Machilus chinensis, Aporosa yunnanensis, Cryptocarya concinna, Lindera chunii, Diplazium donianum, Blastus cochinensis and Calophyllum membranaceum. The results are as follows:1) The nutrient order in different organs was N:leaf>bark>root>branch>stem,P:leaf>branch>bark>root>stem,K:leaf>bark>branch>root>stem,Ca:bark>branch>root>stem,Mg:leaf>bark>root>branch>stem.2) The highest element content was in species Diplazium donianum , characterized by high N, P, K and Mg. Castanopsis chinensis, Cryptocarya concinna, Lindera chunii, Diplazium donianum had high N content. Castanopsis chinensis, Aporosa yunnanensis, Diplazium donianum had high P content. Schima superba, Aporosa yunnanensis had high Ca content. Blastus cochinensis, Diplazium donianum had high Mg content. Lindera chunii had high Na content. All species had relatively similar K content except for Diplazium donianum. 3) The leaves having higher P content and the stems having lower N,P,K content for upper species were observed. The individuals of Cryptocarya concinna in different layers had similar nutrient content.4) N was most significantly correlated with many other elements. Mg, P and K were significantly correlated with some other elements. Na was not correlated with some other elements. Stem had the most correlated element pairs, and then branch and bark.