Nitrogen addition promotes soil organic phosphorus accumulation through increasing microbial biomass phosphorus in a temperate forest

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2024-11-06 DOI:10.1007/s11104-024-07064-0

Zhijie Chen, Yutong Xiao, Xiongde Dong, Zihao Deng, Xueya Zhou, Guoyong Yan, Junhui Zhang, Shijie Han

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Abstract

Background and aim

Global nitrogen (N) deposition has been proposed to enhance phosphorus (P) limitation in various terrestrial ecosystems. The impact of N addition on soil P transformation, considering both microbial and abiotic properties, is not well understood.

Methods

In this study, the experiment with three levels of N addition (0 (N0, no fertilizer), 25 (N25) and 50 kg N ha⁻¹ yr⁻¹ (N50)) was implemented in a temperate broad-leaved forest to assess the long-term (12 years) effects of N addition on soil P fractions associated with soil properties, iron, aluminum, calcium, phospholipid fatty acids (PLFAs), and enzyme activities.

Results

The results indicated a significant decrease in labile P, despite of a significant increase of approximately 54.0% in available P under N addition (N50). In contrast, the moderately labile P significantly increased under N addition treatment because of the increase in organic P in less labile fractions. The redundancy analysis and mantel-test found soil pH and MBP contributed to the variation of soil P fractions. The results of structural equation model confirmed that the microbial biomass P play a key role in the transformation of soil available P into moderately and occluded P fractions.

Conclusion

These results suggested that the long-term addition of N decreased soil labile P and increased moderate and occluded P fractions through increasing microbial P use efficiency with increased MBP, leading to the enhancement of soil P limitation in the broad-leaved temperate forest.

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通过增加温带森林中微生物的生物量磷，增氮促进土壤有机磷的积累

背景和目的全球氮（N）沉积被认为会加强各种陆地生态系统对磷（P）的限制。本研究在温带阔叶林中进行了三个氮添加水平（0（N0，不施肥）、25（N25）和 50 千克 N ha-1 yr-1（N50））的实验，以评估氮添加对与土壤性质、铁、铝、钙、磷脂脂肪酸（PLFAs）和酶活性相关的土壤磷组分的长期（12 年）影响。结果结果表明，在添加氮的情况下，尽管可利用钾（N50）显著增加了约 54.0%，但可溶性钾却显著减少。相比之下，在添加氮的情况下，中度易溶态 P 显著增加，原因是易溶态较低组分中的有机态 P 增加了。冗余分析和套式检验发现，土壤 pH 值和甲基溴磷对土壤中钾组分的变化有影响。结构方程模型的结果证实，微生物生物量 P 在土壤可利用 P 转化为中等和闭锁 P 的过程中发挥了关键作用。

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

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.