Organic and inorganic nitrogen uptake by 21 dominant tree species in temperate and tropical forests
Organic and inorganic nitrogen uptake by 21 dominant tree species in temperate and tropical forests
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温带和热带森林21种优势树种对有机和无机氮的吸收
DOI：
10.1093/treephys/tpx046
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发表时间：
2017-11
期刊：
影响因子：
4
通讯作者：
Huimin Wang
中科院分区：
文献类型：
--
作者：
Min Liu;Changcheng Li;Xingliang Xu;Wolfgang Wanek;Ning Jiang;Huimin Wang
有证据表明，许多树种可以从土壤中以游离氨基酸的形式吸收有机氮（N），但很少有研究比较温带和热带树种的有机和无机氮吸收模式与菌根状态和演替状态的关系。我们在中国的温带森林和热带森林进行田间水培实验，通过短暂的 15N 暴露来标记完整的树根。共调查了21种优势树种，其中温带森林8种，热带森林13种。所有研究的树种都表现出最高的 NH4+（铵）吸收率，其次是甘氨酸和 NO3-（硝酸盐）。温带树木平均吸收 NH4+ 12.8 μg N g-1 干重 (d.w.) 根 h-1，而热带树木平均吸收 6.8 μg N g-1 d.w.。根 h-1。甘氨酸吸收率平均为 3.1 μg N g-1 d.w.温带树木的根 h-1 和 2.4 μg N g-1 d.w.热带树木的根 h-1。 NO3- 吸收量最低（温带树木平均 0.8 μg N g-1 d.w. root h-1，热带树木平均 1.2 μg N g-1 d.w. root h-1）。 NH4+ 的吸收量在温带森林中占所有三种氮形式总吸收量的 76%，在热带森林中占 64%。温带树种与热带树种的甘氨酸吸收率相似，但贡献略低（温带森林为20%，热带森林为23%）。在温带森林中调查的所有树种都是外生菌根，除热带森林中的一种外，所有树种都是丛枝菌根（AM）。外生菌根树比 AM 树表现出显着更高的 NH4+ 吸收率和更低的 NO3- 吸收率。菌根定植率显着影响 NO3- 或 NH4+ 的吸收率和贡献，但取决于森林类型。我们得出的结论是，温带和热带森林的树种都更喜欢吸收 NH4+，有机氮是第二重要的氮源。这些发现表明，温带和热带森林表现出相似的氮吸收模式，尽管它们的树木生理和土壤生物地球化学过程不同。
Evidence shows that many tree species can take up organic nitrogen (N) in the form of free amino acids from soils, but few studies have been conducted to compare organic and inorganic N uptake patterns in temperate and tropical tree species in relation to mycorrhizal status and successional state. We labeled intact tree roots by brief 15N exposures using field hydroponic experiments in a temperate forest and a tropical forest in China. A total of 21 dominant tree species were investigated, 8 in the temperate forest and 13 in the tropical forest. All investigated tree species showed highest uptake rates for NH4+ (ammonium), followed by glycine and NO3- (nitrate). Uptake of NH4+ by temperate trees averaged 12.8 μg N g-1 dry weight (d.w.) root h-1, while those by tropical trees averaged 6.8 μg N g-1 d.w. root h-1. Glycine uptake rates averaged 3.1 μg N g-1 d.w. root h-1 for temperate trees and 2.4 μg N g-1 d.w. root h-1 for tropical trees. NO3- uptake was the lowest (averaging 0.8 μg N g-1 d.w. root h-1 for temperate trees and 1.2 μg N g-1 d.w. root h-1 for tropical trees). Uptake of NH4+ accounted for 76% of the total uptake of all three N forms in the temperate forest and 64% in the tropical forest. Temperate tree species had similar glycine uptake rates as tropical trees, with the contribution being slightly lower (20% in the temperate forest and 23% in the tropical forest). All tree species investigated in the temperate forest were ectomycorrhizal and all species but one in the tropical forest were arbuscular mycorrhizal (AM). Ectomycorrhizal trees showed significantly higher NH4+ and lower NO3- uptake rates than AM trees. Mycorrhizal colonization rates significantly affected uptake rates and contributions of NO3- or NH4+, but depended on forest types. We conclude that tree species in both temperate and tropical forests preferred to take up NH4+, with organic N as the second most important N source. These findings suggest that temperate and tropical forests demonstrate similar N uptake patterns although they differ in physiology of trees and soil biogeochemical processes.
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影响因子：
4.9
作者：
MARSCHNER, H;DELL, B
通讯作者：
DELL, B
影响因子：
6.9
作者：
Vicente;Torres-Olivar;Oscar;Gabriel;Villegas-Torres;Martha;Lilia;Dominguez-Patifio;Hoctor;Sotelo-Nava;Antônio;Rodrlguez-Martme;Rosa;Mária;Melgoza-Aleman;Luis;Alonso;Valdez-Aguilar;Irfin;Alia-Tejacal
通讯作者：
Vicente;Torres-Olivar;Oscar;Gabriel;Villegas-Torres;Martha;Lilia;Dominguez-Patifio;Hoctor;Sotelo-Nava;Antônio;Rodrlguez-Martme;Rosa;Mária;Melgoza-Aleman;Luis;Alonso;Valdez-Aguilar;Irfin;Alia-Tejacal
DOI：
10.1071/pp01238
发表时间：
2002-06
期刊：
Functional plant biology : FPB
影响因子：
--
作者：
W. Wanek;S. Arndt;W. Huber;M. Popp
通讯作者：
W. Wanek;S. Arndt;W. Huber;M. Popp
影响因子：
2.7
作者：
Nordin, A;Högberg, P;Näsholm, T
通讯作者：
Näsholm, T
DOI：
10.1111/j.1469-8137.2007.02259.x
发表时间：
2007-11
期刊：
The New phytologist
影响因子：
--
作者：
I. Alexander
通讯作者：
I. Alexander