亚热带幼林树木功能性状与叶片氮磷重吸收率的关系

doi:10.13287/j.1001-9332.202212.007

摘要/Abstract

摘要： 本研究以亚热带29种3年生人工纯林为对象,研究了29个树种功能性状与氮磷重吸收效率的关系。结果表明: 29种幼林平均氮、磷重吸收效率分别为50.5%和57.3%。22种丛枝菌根树种的氮重吸收效率平均为52.7%,显著高于7种外生菌根树种(45.1%)。29个树种的细根组织密度与氮重吸收效率呈显著正相关,7种外生菌根树种细根直径与磷重吸收效率呈显著正相关,22种丛枝菌根树种的功能性状对氮重吸收效率和磷重吸收效率无显著影响。在29个树种中,菌根类型、比叶面积、细根组织密度、叶厚度及叶厚度与菌根类型的相互作用共同解释氮重吸收效率变异的27%,比根长、细根碳含量、细根碳氮比、菌根类型、叶片碳含量及叶片碳含量与菌根类型的相互作用共同解释磷重吸收效率变异的35%。因此,亚热带树种根系功能性状能较好地预测了氮、磷养分重吸收效率,综合多个功能性状可以更好地揭示不同生物因子对养分重吸收的相对重要性。

关键词: 功能性状, 菌根类型, 氮重吸收效率, 磷重吸收效率

Abstract: We examined the relationship between tree functional traits and leaf nitrogen and phosphorus resorption efficiencies across 29 species in 3-year-old pure plantations in subtropical China. The results showed that the average nitrogen (NRE) and phosphorus (PRE) resorption efficiencies in 29 young plantations were 50.5% and 57.3%, respectively. The average NRE of 22 arbuscular mycorrhizal (AM) tree species was 52.7%, significantly higher than that of the seven ectomycorrhizal (EM) tree species (45.1%). NRE was positively correlated with fine root tissue density across the 29 tree species. PRE was positively correlated with root diameter in the seven EM tree species. Functional traits of 22 AM tree species were not associated with NRE and PRE. Among all of the 29 tree species, mycorrhizal type, specific leaf area, fine root tissue density, leaf thickness, and the interaction effects of mycorrhizal type with leaf thickness explained 27% variation in NRE. Specific root length, fine root carbon content, fine root carbon to nitrogen ratio, mycorrhizal type, leaf carbon content, and the interaction effects of mycorrhizal type with leaf carbon content explained 35% variation in PRE. Root functional trait of subtropical species could predict nitrogen and phosphorus resorption efficiencies. The model with multiple functional traits could better reveal the relative importance of different biological factors on nutrient resorption efficiency.

Key words: functional trait, mycorrhizal type, nitrogen resorption efficiency, phosphorus resorption efficiency

鞠雯, 黄志群, 傅彦榕, 王涛, 王振宇, 余再鹏. 亚热带幼林树木功能性状与叶片氮磷重吸收率的关系[J]. 应用生态学报, 2022, 33(12): 3229-3236.

JU Wen, HUANG Zhi-qun, FU Yan-rong, WANG Tao, WANG Zhen-yu, YU Zai-peng. Relationships between tree functional traits and leaf nitrogen and phosphorus resorption efficiencies in subtropical young plantations[J]. Chinese Journal of Applied Ecology, 2022, 33(12): 3229-3236.

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