Independent and interactive effects of N and P additions on foliar P fractions in evergreen forests of southern China

IF 3.8 1区 农林科学 Q1 FORESTRY Forest Ecosystems Pub Date : 2024-10-18 DOI:10.1016/j.fecs.2024.100265
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Abstract

Fertilization or atmospheric deposition of nitrogen (N) and phosphorus (P) to terrestrial ecosystems can alter soil N (P) availability and the nature of nutrient limitation for plant growth. Changing the allocation of leaf P fractions is potentially an adaptive strategy for plants to cope with soil N (P) availability and nutrient-limiting conditions. However, the impact of the interactions between imbalanced anthropogenic N and P inputs on the concentrations and allocation proportions of leaf P fractions in forest woody plants remains elusive. We conducted a meta-analysis of data about the concentrations and allocation proportions of leaf P fractions, specifically associated with individual and combined additions of N and P in evergreen forests, the dominant vegetation type in southern China where the primary productivity is usually considered limited by P. This assessment allowed us to quantitatively evaluate the effects of N and P additions alone and interactively on leaf P allocation and use strategies. Nitrogen addition (exacerbating P limitation) reduced the concentrations of leaf total P and different leaf P fractions. Nitrogen addition reduced the allocation to leaf metabolic P but increased the allocation to other fractions, while P addition showed opposite trends. The simultaneous additions of N and P showed an antagonistic (mutual suppression) effect on the concentrations of leaf P fractions, but an additive (summary) effect on the allocation proportions of leaf P fractions. These results highlight the importance of strategies of leaf P fraction allocation in forest plants under changes in environmental nutrient availability. Importantly, our study identified critical interactions associated with combined N and P inputs that affect leaf P fractions, thus aiding in predicting plant acclimation strategies in the context of intensifying and imbalanced anthropogenic nutrient inputs.
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氮和磷的添加对中国南方常绿林叶片磷含量的独立效应和交互效应
氮(N)和磷(P)在陆地生态系统中的施肥或大气沉降会改变土壤中氮(P)的可用性以及植物生长所受养分限制的性质。改变叶片磷组分的分配可能是植物应对土壤氮(磷)供应和养分限制条件的一种适应策略。然而,不平衡的人为氮和磷输入之间的相互作用对森林木本植物叶片磷组分的浓度和分配比例的影响仍然难以捉摸。我们对有关叶片磷组分的浓度和分配比例的数据进行了荟萃分析,特别是与常绿林中单独和联合添加氮和磷有关的数据,常绿林是中国南方的主要植被类型,其初级生产力通常被认为受到磷的限制。氮的添加(加剧了磷的限制)降低了叶片总磷和不同叶片磷组分的浓度。氮的添加减少了叶片代谢态磷的分配,但增加了其他部分的分配,而磷的添加则呈现出相反的趋势。同时添加氮和磷对叶片磷组分的浓度有拮抗(相互抑制)作用,但对叶片磷组分的分配比例有加成(综合)作用。这些结果突显了在环境养分供应变化的情况下,森林植物叶片钾组分分配策略的重要性。重要的是,我们的研究确定了与影响叶片磷组分的氮和磷综合输入相关的关键交互作用,从而有助于预测植物在人为养分输入加剧和失衡情况下的适应策略。
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来源期刊
Forest Ecosystems
Forest Ecosystems Environmental Science-Nature and Landscape Conservation
CiteScore
7.10
自引率
4.90%
发文量
1115
审稿时长
22 days
期刊介绍: Forest Ecosystems is an open access, peer-reviewed journal publishing scientific communications from any discipline that can provide interesting contributions about the structure and dynamics of "natural" and "domesticated" forest ecosystems, and their services to people. The journal welcomes innovative science as well as application oriented work that will enhance understanding of woody plant communities. Very specific studies are welcome if they are part of a thematic series that provides some holistic perspective that is of general interest.
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