Fungal necromass carbon contributes more to POC and MAOC under different forest types of Qinling Mountains

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2024-12-07 DOI:10.1007/s11104-024-07095-7

Liming Lai, Jiaxi Zhao, Yanxing Dou

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引用次数: 0

Abstract

Background and aims

Microbial necromass carbon (MNC) is important to soil organic carbon (SOC) fractions formation. However, it is still not clear whether the contribution of MNC to particulate and mineral-associated organic carbon (POC and MAOC) in different forest types are various.

Methods

The Pinus tabuliformis forest (P), Quercus aliena forest (Q), and the mixed forest of Pinus tabuliformis and Quercus aliena (P + Q) of Qinling Mountains were selected. Then contents of MNC, contribution of MNC to POC and MAOC, as well as its influencing factors at 0–10, 10–20 and 20–40 cm soil layers were analyzed.

Results

Under three forest types, contents of MNC, fungal necromass carbon (FNC) and bacterial necromass carbon (BNC) decreased with increasing of soil depth. FNC was higher than BNC, and FNC/BNC was higher than 2. At 20–40 cm layer, the ratio of MNC/MAOC in P (11.9%) was significantly lower than that in Q (23.8%) (p < 0.05), with no significant difference in MNC/POC. The ratio of MNC/MAOC (21.2%) was higher than MNC/POC (20.3%). Total nitrogen, microbial biomass carbon and nitrogen were main factors during MNC accumulation. MNC/POC and MNC/MAOC were mainly influenced by total phosphorus, soil moisture, soil texture and cellulose in litter.

Conclusions

Compared to BNC, FNC dominated the accumulation of MNC in different forest types, and it contributed more to MAOC than POC. Soil physicochemical properties, such as total nitrogen and phosphorus, soil texture and chemical composition of litter, especially cellulose were main factors during MNC contributing to SOC components accumulation.

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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.