Changes in soil pH and nutrient stoichiometry alter the effects of litter addition on soil nitrogen transformations and nitrous oxide emissions

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2025-01-07 DOI:10.1007/s11104-024-07145-0

Jing Wang, Miaomiao Cao, Uwiragiye Yves, Meiqi Chen, Yi Cheng, Zezhong Lin, Renhua Zheng

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引用次数: 0

Abstract

Background and aims

Chinese-fir (Cunninghamia lanceolata) clonal varieties are used to establish fast-growing plantations in subtropical China and produce litters of varying quality. Litter serves as primary sources of carbon (C) and nitrogen (N) inputs to soils in forests and plays an important role in regulating soil N transformations, including N losses via nitrous oxide (N₂O) emissions. However, little is known about the effects of litter addition from different Chinese-fir clones on soil N dynamics.

Methods

We conducted an aerobic incubation experiment to investigate net rates of N mineralization (NMR) and nitrification (NNR) and N₂O emissions in soils from seven forests planted with different Chinese-fir clones as affected by litter addition at the rates of 0, 0.3%, 0.6%, and 0.9% of dry soil weight.

Results

Both NMR and NNR decreased linearly with increasing litter addition rate, while soil respiration and N₂O emissions exhibited the opposite, regardless of the clonal treatment. In addition, NMR and NNR, expressed as mg N per g carbon (C) applied, either decreased or increased logarithmically with increasing soil pH and C to phosphorus (P) ratio, respectively. Structural equation modeling showed that litter properties (i.e., C/N and total P content) drive NMR and NNR by influencing soil respiration, pH, and nutrient stoichiometry. However, the response of N₂O emissions to litter addition is not associated with either soil or litter properties.

Conclusions

Our findings indicate that effects of adding litter from Chinese-fir clones on soil N transformations are dependent on edaphic factors, which are primarily influenced by litter quality.

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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.