Microbial biomass carbon distribution under agroforestry practices and soil depth variations in Southern Ethiopia

IF 2 3区农林科学 Q2 AGRONOMY

Agroforestry Systems Pub Date : 2025-03-01 DOI:10.1007/s10457-025-01133-8

Nebiyou Masebo, Emiru Birhane, Serekebirhan Takele, Juan J. Lucena, Pérez-Sanz Araceli, Felipe Yunta, Zerihun Belay, Agena Anjulo

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引用次数: 0

Abstract

The land-use change from agroforestry (AF) to monoculture-based agriculture has the potential to change soil microbial biomass carbon (MBC). The MBC has been used as an indicator of soil quality as well as to determine the microbial status of soil. The aim of this study was to analyze the distribution of soil MBC across different agroforestry practices (AFPs) at two depths in southern Ethiopia. Soil samples were collected from cropland/parkland, woodlots, home gardens, and trees on soil and water conservation-based agroforestry practices (AFPs). The MBC was determined using the difference in fumigated and non-fumigated extracted carbon contents. The MBC and soil microbial biomass quotient (MBQ) were significantly different among the different AFPs (P < 0.05). The highest contents of MBC were reported from homegarden on topsoil (505.36 ± 12.45 mg kg⁻¹) and subsoil (401.88 ± 7.26 mg kg⁻¹) soil depths (topsoil = 0–30 cm, subsoil = 30–60 cm), followed by woodlot (topsoil: 464.37 ± 9.19 mg kg⁻¹) and (subsoil: 380.24 ± 6.88 mg kg⁻¹), while the lowest result was registered from the subsoil of the croplands (153.10 ± 46.44 mg kg⁻¹). The higher percentage of MBQ was recorded under the woodlots in topsoil layers (1.48%) and subsoil (1.37%), followed by homegarden (topsoil = 1.41%, subsoil = 1.25%), while the lowest was found under the cropland in subsoil (0.57%). The highest content of soil organic carbon was found under homegarden in topsoil (3.62%) and subsoil (3.23%) followed by woodlot (topsoil: 3.16%, subsoil: 2.87%) and trees on soil and water conservation structures (topsoil: 2.69%, subsoil: 2.51%), while the lowest value was registered under cropland/parkland AF practices (topsoil: 2.67%, subsoil: 2.46%). The distribution of MBC was significantly related to soil organic carbon, soil total nitrogen, and soil pH in topsoil. Homegarden and woodlot AFPs were suitable for soil MBC improvement among the different AFPs studied, implying that tree-based systems are important for increasing of MBC and ecosystem stability.

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埃塞俄比亚南部农林业条件下微生物生物量碳分布和土壤深度变化

农林业向单作农业的土地利用变化有可能改变土壤微生物生物量碳（MBC）。MBC已被用来作为土壤质量的指标以及确定土壤微生物状况。本研究的目的是分析埃塞俄比亚南部两个深度不同农林业实践（AFPs）土壤MBC的分布。以水土保持为基础的农林业实践（AFPs）从农田/公园、林地、家庭花园和树木中收集土壤样本。利用熏蒸和未熏蒸提取碳含量的差异来测定MBC。不同AFPs的MBC和土壤微生物生物量商（MBQ）差异显著（P < 0.05）。土壤表层（505.36±12.45 mg kg - 1）和底土（401.88±7.26 mg kg - 1）（表层= 0 ~ 30 cm，底土= 30 ~ 60 cm） MBC含量最高，其次为林地（464.37±9.19 mg kg - 1）和底土（380.24±6.88 mg kg - 1），农田底土最低（153.10±46.44 mg kg - 1）。林下土壤MBQ最高（表层1.48%），次之（表层1.41%，下层1.25%），农田土壤MBQ最低（0.57%）。土壤有机碳含量最高的是园地表层土（3.62%）和底土（3.23%），其次是林地（表层土3.16%，底土2.87%）和水土保持结构上的树木（表层土2.69%，底土2.51%），最低的是农田/园地AF实践（表层土2.67%，底土2.46%）。表层土壤中MBC的分布与土壤有机碳、土壤全氮和土壤pH值有显著相关。在不同的AFPs中，园地和林地的AFPs最适合改善土壤MBC，这表明树木为基础的系统对提高MBC和生态系统的稳定性具有重要作用。

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来源期刊

Agroforestry Systems 农林科学-林学

CiteScore

5.30

自引率

9.10%

发文量

审稿时长

4.5 months

期刊介绍： Agroforestry Systems is an international scientific journal that publishes results of novel, high impact original research, critical reviews and short communications on any aspect of agroforestry. The journal particularly encourages contributions that demonstrate the role of agroforestry in providing commodity as well non-commodity benefits such as ecosystem services. Papers dealing with both biophysical and socioeconomic aspects are welcome. These include results of investigations of a fundamental or applied nature dealing with integrated systems involving trees and crops and/or livestock. Manuscripts that are purely descriptive in nature or confirmatory in nature of well-established findings, and with limited international scope are discouraged. To be acceptable for publication, the information presented must be relevant to a context wider than the specific location where the study was undertaken, and provide new insight or make a significant contribution to the agroforestry knowledge base