Does nitrogen fertilization alter the scaling relationships of multinutrients in tree organs? Evidence from Chinese hickory (Carya cathayensis) saplings
Does nitrogen fertilization alter the scaling relationships of multinutrients in tree organs? Evidence from Chinese hickory (Carya cathayensis) saplings
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DOI：
10.1007/s11104-022-05817-3
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发表时间：
2022-11
期刊：
影响因子：
4.9
通讯作者：
Hongtao Xie;Haidong Xu;Xue-qin Li;Lauren S. Pile Knapp;Deliang Lu;Songheng Jin
中科院分区：
文献类型：
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作者：
Hongtao Xie;Haidong Xu;Xue-qin Li;Lauren S. Pile Knapp;Deliang Lu;Songheng Jin
目的过量施肥引起的氮（N）富集影响陆地生态系统中营养元素的耦合，但它是否会改变多营养元素[包括常量营养元素：N，P，K，Ca，Mg]与微量营养元素：锰（Mn）、铁（Fe）和锌]尚不清楚以6个氮素水平的山核桃幼苗为研究对象，研究了不同氮素水平下山核桃营养器官中多种营养元素含量的比例关系。而茎和根的相关性较低。特别是微量营养素，大多数是负相关的宏量营养素。显着的异速生长关系，检测多营养素，但反应模式都是器官和营养依赖。例如，正异速生长关系，检测到N与其他常量营养素，而负异速生长关系，观察与N相关的微量营养素的反应。叶片的正向异速生长关系比负向异速生长关系更为显著。出乎意料的是，增加N施肥最低限度地改变了多元素之间的标度指数，除了茎N-Mg，根Mn-Fe，根P-Ca，和叶P-Ca.ConclusionsChinese山核桃树苗表现出相对较高的营养稳态过量N肥时，施加。这些结果将增强我们对林木中多种营养素之间器官依赖性异速生长关系的理解，并可能为植物如何发展适应性功能性状以增加N施肥提供新的见解。
AimsNitrogen (N) enrichment from excessive fertilization influences the coupling of nutrients in terrestrial ecosystems, but whether it could alter the scaling relationships between multinutrients [including macronutrients: N, phosphorus (P), potassium, calcium (Ca), magnesium (Mg) and micronutrients: manganese (Mn), iron (Fe) and zinc] remains unclear.MethodsWe conducted an control experiment using two-year-old Chinese hickory (Carya cathayensis) saplings in hydroponics system, with six levels of N fertilization, to evaluate variations in scaling relationships of multinutrient concentrations in vegetative organs of Chinese hickory under consistent N fertilization.ResultsCorrelational relationships between multinutrients concentrations were most significant in leaves, while stems and roots were less related. Micronutrients, in particular, were mostly negatively related to macronutrients. Significant allometric relationships were detected among multinutrients, but the response patterns were both organ- and nutrient-dependent. For example, positive allometric relationships were detected in N versus other macronutrients while negative allometric relationships were observed with N related to micronutrient response. Leaves generally presented more positive allometric relationships than negative relationships. Beyond expectation, increasing N fertilization minimally altered the scaling exponents between multinutrients, except stem N-Mg, root Mn-Fe, root P-Ca, and leaf P-Ca.ConclusionsChinese hickory saplings displayed relatively high nutrient homeostasis when excessive N fertilizer was applied. These results will enhance our understanding of organ-dependent allometric relationships between multinutrients in forest trees and may offer new insights into how plants develop adaptive functional traits to increasing N fertilization.