N-limitation increases along a temperate forest succession: Evidences from leaf stoichiometry and nutrient resorption
N-limitation increases along a temperate forest succession: Evidences from leaf stoichiometry and nutrient resorption
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氮限制随着温带森林演替而增加：来自叶片化学计量和养分吸收的证据
DOI：
10.1093/jpe/rtac017
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发表时间：
2022
影响因子：
2.7
通讯作者：
Jin Guangze
中科院分区：
文献类型：
--
作者：
Zhang Peng;Lü Xiao-Tao;Li Mai-He;Wu Tonggui;Jin Guangze
摘要。目标。森林生产力和碳(C)固存在很大程度上取决于土壤氮和磷的有效性。然而，到目前为止，营养限制随森林演替的时间变化仍存在争议。方法。叶片化学计量学和养分吸收是预测植物生长营养限制的重要指标。本研究测量了温带森林演替4个阶段所有木本树种绿叶和凋落叶中氮(N)和磷(P)的含量，分析了森林演替过程中非生物和生物因子对叶片化学计量和养分吸收的影响。重要的发现。在个体尺度上，演替末期叶片氮、磷浓度显著增加，叶片氮磷比无显著变化。NRE随演替显著增加，PRE先增加后降低。NRE:PRE比值的显著增加只发生在演替末期。植物N循环对土壤养分的响应小于P，在群落尺度上，随着森林演替，叶片N和P浓度先降低后增加，主要受Shannon-Wiener指数和物种丰富度的影响。叶片氮磷比随演替变化显著，主要由群落加权平均胸径（DBH）决定。氮吸收效率（NRE）增加，受物种丰富度和胸径的显著影响，而磷吸收效率（PRE）相对稳定。因此，NRE:PRE比值显著增加，表明随着温带森林演替，氮素限制加剧。这些结果可能反映了在生物多样性较高的群落中，种间对有限资源的激烈竞争。综上所述，我们的研究结果强调了生物因子在驱动森林生态系统养分循环中的重要性，并为中国温带和北方针叶林的可持续肥料管理实践提供了有价值的信息。
Abstract. Aims. Forest productivity and carbon (C) sequestration largely depend on soil N and P availability. To date, however, the temporal variation of nutrient limitation along forest succession is still under debate.. Methods. Leaf stoichiometry and nutrient resorption are important indicators for predicting nutrient limitation of plant growth. Here, we measured nitrogen (N) and phosphorus (P) concentrations in green leaves and leaf litter for all woody species at four stages of temperate forest succession, and analyzed how abiotic and biotic factors affect leaf stoichiometry and nutrient resorption along forest succession.. Important Findings. At the individual scale, leaf N and P concentrations had a significant increase at the end of the succession, and leaf N:P ratio showed no change. NRE increased significantly with succession, but PRE first increased and then decreased. Significant increase in NRE:PRE ratios only occurred at the end of the succession. Moreover, Plant N cycling were less responsive to soil nutrient than P. At the community scale, we found that leaf N and P concentrations first decreased and then increased along forest succession, were mainly affected by Shannon-Wiener index and species richness. Leaf N:P ratio significantly varied with succession, was mainly determined by community weighted mean diameter at breast height (DBH). Nitrogen resorption efficiency (NRE) increased, which was significantly influenced by species richness and DBH, while P resorption efficiency (PRE) was relatively stable. Thus, the NRE:PRE ratios significantly increased, indicating that N limitation was exacerbated with the temperate forest succession. These results might reflect the intense interspecific competition for limiting resource in a higher biodiversity community. In conclusion, our findings highlight the importance of biotic factors in driving forest ecosystem nutrient cycling and provide valuable information for sustainable fertilizer management practices in China’s temperate and boreal forests.