Redistribution of Soil Phosphorus Fractions Alleviates Phosphorus Limitations Following Afforestation

IF 12 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Minghui Wu, Quanjie Xu, Jiao Feng, Xueyu Wang, Deping Zhai, Xiaoli Cheng
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Abstract

Afforestation plays a crucial role in mitigating climate change, yet the transfer of soil phosphorus (P) to aboveground biomass may lead to soil P limitation. However, the influences of afforestation on soil P fractions and availability remain unclear. Here, we investigated soil P fractions at 144 paired sampling sites by comparing afforested lands with adjacent non-afforested lands in subtropical China. Afforestation increased the proportions of available P, labile P, and moderately-labile P, while decreasing inorganic P concentrations, with no significant effect on soil total P. These shifts were strongly coupled with the increase in organic P and the decline in stable P. Notably, afforestation with broad-leaved species (i.e., Quercus variabilis) increased soil organic P concentration, while afforestation with coniferous species (i.e., Pinus massoniana and Platycladus orientalis) reduced soil inorganic P concentration. Afforestation weakened the effects of soil microclimates on labile P fractions (e.g., decreased with moisture) in non-afforested soil. In contrast, plant nutrients (e.g., leaf P concentration) exhibited positive effects on inorganic P fractions in afforested soils. Soil iron oxides (Feo) were the primary cause of P variations in both afforested and non-afforested soils; particularly, lower Feo and soil pH under afforested lands likely promoted the desorption of more non-stable P fractions compared to the non-afforested soils. Overall, our findings suggest that afforestation may alleviate soil P limitation by enhancing the concentration of labile and moderately-labile P fractions, while soil inorganic P fractions are crucial for regulating soil P dynamics, thereby providing insights for optimizing afforestation practices.

Abstract Image

土壤磷组分的再分配缓解了造林后的磷限制
造林在减缓气候变化中发挥着至关重要的作用,但土壤磷向地上生物量的转移可能导致土壤磷的限制。然而,造林对土壤磷组分和有效性的影响尚不清楚。本文通过对中国亚热带地区144个成对样点的土壤磷含量进行了研究,并将造林地与邻近非造林地进行了比较。造林增加了有效磷、稳定磷和中稳定磷的比例,降低了无机磷的含量,但对土壤全磷的影响不显著。这些变化与有机磷的增加和稳定磷的下降密切相关,其中阔叶树种(即栎)造林增加了土壤有机磷含量,而针叶树种(即栎)造林增加了土壤有机磷含量。马尾松和侧柏降低了土壤无机磷浓度。造林减弱了土壤小气候对非造林土壤中活性磷组分的影响(如随湿度降低)。相反,植物养分(如叶片磷浓度)对造林土壤无机磷组分有正向影响。土壤氧化铁(Feo)是造林和非造林土壤磷变化的主要原因;特别是,较低的Feo和土壤pH可能促进了非稳定磷组分的解吸。综上所述,造林可通过提高土壤不稳定磷和中度不稳定磷组分的浓度来缓解土壤磷的限制,而土壤无机磷组分对调节土壤磷的动态至关重要,从而为优化造林实践提供了见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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