中亚热带杉木人工老龄林林下植被叶片碳氮磷化学计量特征

Stoichiometric Characteristics of C,N,P for Old Cunninghamia lanceolata Artificial Plants in the Mid-subtropics of China

以福建省三明市莘口教学林场小湖工区杉木人工老龄林林下87种植物为研究对象,比较不同功能群植物叶片碳氮磷化学计量特征,分析植物各叶片碳氮磷含量。结果显示:杉木人工老龄林林下87种植被叶片C、N、P的平均含量分别为447.45、18.14和0.71 mg·g-1,叶片C∶N、C∶P及N∶P比值分别为26.56、704.94和27.10,不同生活型植物的C、N、P含量均存在显著差异,C∶P和N∶P在不同生活型植物间不存在显著差异,相关分析表明植物的叶片C∶N、C∶P都与相应的N、P含量呈现极显著负相关性(P<0.01),而叶片N含量与P含量的变化并不相关。以上研究结果表明,受外部环境的影响,中亚热带杉木人工植被植物对养分元素的利用效率显著低于全国陆地植物的平均水平,不同科和不同生活型功能群植物对环境的适应能力显著不同,表现出显著的养分适应策略差异性。

Variations of leaf stoichiometry in the mid-subtropics are studied to understand regional bi-otic and abiotic features and provide basis for community classification. Patterns of leaf traits of 87 plants are investigated to detect their difference among functional groups and relationships between each trait. Results show that the mean content of artificial plant leaf C （ carbon ） , N （ nitrogen ） and P （phosphorus） were （447. 45 ± 31. 84）, （18. 14 ± 4. 96） and （0. 71 ± 0. 23） mg·g-1 respec-tively in the study areas, C∶N, C∶P and N∶P ratios were （ 26. 56 ± 7. 64 ） , （ 704. 94 ± 256. 61 ） and （27. 10 ± 7. 85）, respectively , which were lower than the global average. Great difference for＆amp;nbsp;leaf C, N and P content were presented in different life from plants were also obtained. There was no difference for C∶P and N∶P between different life forms, while the C∶P for shrub and tree functional group were significantly higher than herb functional group. Correlation analysis indicated that leaf C∶N, C∶P were negatively correlated with N, P content significantly, while no correlation between leaf N and P. The above results documented that mid-subtropical areas limited the plants nutrients use effi-ciency, which may be the adaptive strategy for the artificial plants in this environments. Besides, dif-ferent functional group had different adaptability to environment and significantly nutrient adapt strategy diversity was presented in this study.