不同入侵程度的微甘菊及本土种豨莶碳氮磷化学计量特征与营养策略

生态学杂志

不同入侵程度的微甘菊及本土种豨莶碳氮磷化学计量特征与营养策略

王桔红¹，陈文^2*,张燕芳¹,李云¹,史生晶³,郑佳玉¹,陈燕霞¹

（¹韩山师范学院食品工程与生物科技学院，广东潮州 521041； ²韩山师范学院烹饪与酒店管理学院地理系, 广东潮州 521041； ³西北师范大学生命科学学院，兰州 730070）

出版日期:2020-06-10 发布日期:2020-06-10

Carbon, nitrogen, and phosphorus stoichiometry and nutrition strategy of invasive species Mikania micrantha with three invasive degrees and native species Siegesbeckia orientalis.

WANG Ju-hong¹, CHEN Wen^2*, ZHANG Yan-fang¹, LI Yun¹, SHI Shen-jing³, ZHENG Jia-yu¹, CHEN Yan-xia¹

(¹College of Food Technology and Life Science, Hanshan Normal University, Chaozhou 521041, Guangdong, China; ²Department of Geography, School of Culinary Arts and Hospitality Management, Hanshan Normal University, Chaozhou 521041, Guangdong, China;³College of Life Sciences, Northwestern Normal University, Lanzhou 730070, China).

Online:2020-06-10 Published:2020-06-10

摘要/Abstract

摘要： 对3种入侵程度（重度、中度、轻度）的微甘菊（Mikania micrantha）各器官（根、茎、叶）和土壤碳（C）、氮（N）、磷（P）含量进行了测定，并对微甘菊和同科本土种豨莶（Siegesbeckia orientalis）的碳氮磷化学计量特征进行比较，以探查不同入侵程度的微甘菊各器官C、N、P化学计量动态变化，剖析其资源分配特征与营养对策。结果表明：1）微甘菊入侵地为高N、高P生境，轻度入侵地土壤C、N、AN和AP含量均大于其他2个生境，即随入侵程度的增加，土壤C、N、P含量有所下降；2）3种入侵程度微甘菊叶N含量显著大于根和茎，重度入侵和轻度入侵的茎P含量显著高于根和叶，入侵过程中P元素更多地分配至茎，N元素更多地分配至叶；3）3种入侵程度的微甘菊根和茎N∶P值小于叶N∶P，轻度入侵的微甘菊茎N∶P显著小于重度和中度入侵，显示微甘菊在入侵过程中茎、根具有快速生长特性；4）微甘菊根、茎N∶P和C∶P值显著小于本土种豨莶，微甘菊在高N、高P生境中采取了“生长竞争策略”战胜本土种；5）微甘菊根C∶N值与根N∶P之间、茎C∶N值与茎N∶P之间均呈极显著负相关，即存在生长与贮存之间的能量分配权衡策略；6）微甘菊茎Ｐ含量与0～10 cm土壤C、N含量呈显著正相关，微甘菊根P含量与10～20 cm土壤AP含量呈显著正相关，即随土壤营养水平的升高，植物增大了对P元素的吸收和利用率，增加了成功入侵的几率。微甘菊通过对土壤营养（尤其是P）的快速吸收、利用和分配，使茎和根的生长速率加快，采取“生长竞争策略”成功入侵。

关键词: 穿透雨排除, 锐齿栎, 反射光谱, 水分, 光合色素

Abstract: Biological invasion is one of the most important threats to global biodiversity and ecosystem functioning. In this study, we measured carbon, nitrogen, and phosphorus content and their ratios in alien species Mikania micrantha with three invasive degrees and native species Siegesbeckia orientalis to explore the nutritional strategy of M. micrantha. The results showed that for M. micrantha, soil N and P contents in the three habitats were high. The contents of soil C, N, AN, and AP with mild invasion were higher than that in the other two habitats, showing that soil nutrients reduced with the increasing invasion. Leaf N content in M. micrantha under three invasive degrees were significantly greater than that of root and stem. Under severe and median invasion degrees, stem P content was significantly higher than root P and leaf P, indicating that more P was allocated to stem with increasing invasion. In contrast, more N was allocated to leaf. N∶P in root and stem of the three invasion degrees were lower than that in leaf. In particular, stem N∶P of mildly invasive M. micrantha was significantly lower than that of the other two invasion degrees, suggesting that the greatest relative growth may occur in stem and root during invasion. Ratios of N∶P and C∶P in root and stem of M. micrantha were significantly lower than that of native species S. orientalis, implying that M. micrantha may grow faster than native species with a “growth competition strategy”. Significant negative correlations were found between C∶N and N∶P in both root and stem for M. micrantha, showing a tradeoff between growth and storage. There was a significant positive correlation between stem P of M. micrantha and soil C and N (0-10 cm), and between root P and soil AP (10-20 cm), indicating that M. micrantha may increase the absorption and utilization of P with increasing soil nutrition. Growth and nutrient strategies varied under different resource conditions (e.g., growth competitive strategy), as well as fundamental tradeoffs between growth and storage, which all contribute to the successful invasion of M. micrantha.

Key words: Quercus aliena var. acuteserrata,  water, spectral reflectance., throughfall elimination, photosynthetic pigment

王桔红，陈文,张燕芳,李云,史生晶,郑佳玉,陈燕霞. 不同入侵程度的微甘菊及本土种豨莶碳氮磷化学计量特征与营养策略[J]. 生态学杂志.

WANG Ju-hong, CHEN Wen, ZHANG Yan-fang, LI Yun, SHI Shen-jing, ZHENG Jia-yu, CHEN Yan-xia. Carbon, nitrogen, and phosphorus stoichiometry and nutrition strategy of invasive species Mikania micrantha with three invasive degrees and native species Siegesbeckia orientalis.[J]. cje.

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