Responses of Foliar Nutrient Status and Stoichiometry to Nitrogen Addition in Different Ecosystems: A Meta-analysis
Responses of Foliar Nutrient Status and Stoichiometry to Nitrogen Addition in Different Ecosystems: A Meta-analysis
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不同生态系统中叶面养分状况和化学计量对氮添加的响应：荟萃分析
DOI：
10.1029/2019jg005347
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发表时间：
2020-02-01
影响因子：
3.7
通讯作者：
Mo, Jiangming
中科院分区：
文献类型：
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作者：
Mao, Jinhua;Mao, Qinggong;Mo, Jiangming
大气氮沉降改变了陆地生态系统中营养物质的循环。然而，除了氮和磷（P）及其化学计量外，关于氮添加如何影响叶面营养的知识有限。我们进行了荟萃分析，包括2,004观察134施肥研究，合成氮添加对多个叶面养分和化学计量在陆地生态系统中的影响，并检查其潜在的控制。总体而言，我们发现，氮添加显著降低叶片P，钾（K），钙（Ca），镁（Mg），和钙：铝（Ca：Al）分别为3.22%，7.58%，9.55%，5.65%，和15.17%，但显着增加叶片N，铝，N：K，N：Ca，和N：Mg分别为19.02%，6.99%，21.06%，27.65%，和11.33%。在森林生态系统中，叶N和P表现出较大的变化，在温带或寒带森林，和叶K，Mg，Mn表现出较大的减少或增加后，N添加在热带森林。施氮对林地叶片K、Mg和Al含量有显著影响（-7.55%，-6.46%，+6.81%），但对草地无显著影响。同样，叶K，Mg和Al表现出显着的变化在木本植物，但不是在草本植物。此外，我们发现环境因素（例如，环境氮沉降，平均年降水量，土壤pH值）影响氮，钾，镁的叶面营养响应氮添加。总之，我们的研究结果表明，氮除了影响叶面养分含量，这些影响的程度不同的生态系统类型。氮（N）、磷（P）、钾（K）、镁（Mg）、铝（Al）、锰（Mn）和铁（Fe）等植物叶片营养元素在植物健康和生态系统功能中起着重要作用，这些元素的不平衡会影响植物的生长。虽然大气氮沉降已被称为影响叶面氮和磷含量，氮沉降如何影响其他叶面营养物质和化学计量存在很大的不确定性。我们进行了一项荟萃分析，以综合氮添加对八种叶面养分浓度的影响（例如，N、P、K、Ca、Mg、Al、Mn和Fe）以及陆地自然生态系统中N和这些元素的化学计量比。我们发现，N的加入显着降低K，Ca，Mg和P，但增加N，Al，和N：K，N：Ca，和N：Mg在整个测试生物群，这些N诱导的影响叶营养不同的生态系统类型。此外，我们发现环境因素（例如，土壤pH值、环境氮沉降和年平均降水量）调节了氮、钾和镁对氮添加的营养响应。本文通过对134篇文献的数据进行元分析，揭示了氮素对植物叶片中多种元素和化学计量学的影响，并对氮素对植物叶片中N、P、K、Mg、Mn不同生态系统类型氮素背景沉降量和年平均降水量的增加降低了叶片氮、钾和镁对氮素的响应
Atmospheric nitrogen (N) deposition alters the cycling of nutrients in terrestrial ecosystems. However, there is limited knowledge regarding how N addition affects foliar nutrients beyond N and phosphorus (P) and their stoichiometry. We conducted a meta-analysis, including 2,004 observations from 134 fertilization studies, to synthesize the effects of N addition on multiple foliar nutrients and stoichiometry in terrestrial ecosystems and to examine their potential controls. Overall, we found that N addition significantly decreased foliar P, potassium (K), calcium (Ca), magnesium (Mg), and calcium:aluminium (Ca:Al) by 3.22%, 7.58%, 9.55%, 5.65%, and 15.17%, respectively, but significantly increased foliar N, Al, N:K, N:Ca, and N:Mg by 19.02%, 6.99%, 21.06%, 27.65%, and 11.33%, respectively. Among the forest ecosystems, foliar N and P exhibited greater changes in temperate or boreal forests, and foliar K, Mg, and Mn showed greater decreases or increases in tropical forests after N addition. Nitrogen addition significantly affected foliar K (-7.55%), Mg (-6.46%), and Al (+6.81%) in forests but not in grasslands. Similarly, foliar K, Mg, and Al showed significant changes in woody plants but not in herbaceous plants. In addition, we found that environmental factors (e.g., ambient N deposition, mean annual precipitation, and soil pH) affected foliar nutrient responses of N, K, and Mg to N addition. In summary, our findings indicate that N addition affects foliar nutrient contents, with the extent of these effects differing among ecosystem type. This is important for understanding and predicting plant growth and nutrient dynamics under N deposition scenarios.Plain Language Summary Foliar nutrients, such as nitrogen (N), phosphorus (P), potassium (K), magnesium (Mg), aluminum (Al), manganese (Mn), and iron (Fe), play an important role in plant health and ecosystem function, and an imbalance in these elements affects plant growth. Although atmospheric N deposition has been known to affect foliar N and P contents, much uncertainty exists on how N deposition affects other foliar nutrients and stoichiometry. We conducted a meta-analysis to synthesize the effects of N addition on eight foliar nutrient concentrations (e.g., N, P, K, Ca, Mg, Al, Mn, and Fe) and the stoichiometric ratios of N and these elements in terrestrial natural ecosystems. We found that N addition significantly decreased K, Ca, Mg, and P but increased N, Al, and N:K, N:Ca, and N:Mg across the tested biomes, and these N-induced effects on foliar nutrients varied depending on the ecosystem type. In addition, we found that environmental factors (e.g., soil pH, ambient N deposition, and mean annual precipitation) regulated foliar nutrient responses of N, K, and Mg to N addition. Our findings provide direct evidence that high N deposition affects the nutrient status of plants in terrestrial natural ecosystems, particularly in tropical/subtropical forests.Key PointsA meta-analysis was conducted with data from 134 papers to reveal the responses of multiple foliar elements and stoichiometry to N addition Responses of foliar N, P, K, Mg, and Mn to N addition varied depending on the ecosystem type Increases in background N deposition and mean annual precipitation decreased the responses of foliar N, K, and Mg to N addition