Changes in plant carbon inputs alter soil phosphorus dynamics in a coniferous forest ecosystem in subtropical mountain area

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2024-11-20 DOI:10.1016/j.catena.2024.108572

Luoqi Zhao , Xiaoni Wu , Yongjian He , Huaye Shang , Changxing Hu , Changqun Duan , Denggao Fu

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引用次数: 0

Abstract

Plant carbon input aboveground and underground influences soil biological and physicochemical processes in forest ecosystems. However, compared with the well-known interactions between plant carbon and soil carbon or nitrogen, the impact on soil phosphorus (P) dynamics remains unclear. Here we investigated soil P dynamics in aggregates and bulk soil after one-year of plant carbon removal treatments (RL, removing litter; TG, tree girdling; RLTG, combination of removing litter and tree girdling; CK, control) under subtropical Pinus yunnanensis forest in a soil P-enriched degraded mountain area. Compared to CK, tree girdling significantly decreased the macroaggregate proportion and increased the microaggregate proportion by changing soil total carbon (TC) and Fe concentration. With the decrease of soil TC, the increase of HCl-Pi (inorganic P extracted by HCl) in microaggregate and silt and clay was significantly higher than that in macroaggregate. In addition, easily-available P and non-available P at bulk soils significantly declined and increase under RL and TG treatments, respectively. Redundancy analysis revealed that Fe, TC, and acid phosphatase activity were the main factors affecting P fractions in bulk soils. Higher δ¹⁸O_P (oxygen isotope composition of phosphate) values of HCl-Pi pool and its significantly negative relationship with soil TC across the all carbon removal treatments, suggesting the weakened ability for plant to unlock soil bioavailable inorganic P combined with minerals induced by different plant carbon removal treatments. Overall, our results highlight that the importance of litter and root carbon in regulating soil P fractions and dynamics by altering the proportion of soil aggregates and the physicochemical properties of bulk soil.

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植物碳输入量的变化改变亚热带山区针叶林生态系统的土壤磷动态

植物地上和地下的碳输入会影响森林生态系统中的土壤生物和物理化学过程。然而，与众所周知的植物碳与土壤碳或氮之间的相互作用相比，植物碳对土壤磷（P）动态的影响尚不清楚。在此，我们研究了在土壤磷富集的退化山区亚热带云南松林下，经过一年的植物碳清除处理（RL，清除枯枝落叶；TG，树木束腰；RLTG，清除枯枝落叶和树木束腰的组合；CK，对照）后，聚集体和大体积土壤中的土壤磷动态。与 CK 相比，通过改变土壤总碳（TC）和铁的浓度，疏枝显著降低了大团聚体的比例，增加了微团聚体的比例。随着土壤总碳量的减少，微团聚体、粉土和粘土中 HCl-Pi（用盐酸提取的无机磷）的增加量明显高于大团聚体。此外，在 RL 和 TG 处理下，块状土壤中的易利用磷和不可利用磷分别明显减少和增加。冗余分析表明，铁、TC 和酸性磷酸酶活性是影响块状土壤中磷组分的主要因素。在所有碳清除处理中，HCl-Pi 池的δ18OP（磷酸盐的氧同位素组成）值较高，且与土壤 TC 呈显著负相关，这表明不同的植物碳清除处理会削弱植物释放土壤中生物可利用的无机磷和矿物质的能力。总之，我们的研究结果凸显了枯落物和根系碳通过改变土壤团聚体的比例和大体积土壤的理化性质，在调节土壤碳组分和动态方面的重要性。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.