{"title":"Plant diversity and soil seed bank composition in scattered tree-dominated farmlands, Southern Ethiopia","authors":"Tirusew Walle, Temie Alehegn, Assefa Deginew, Mekdes Ourge, Yishak Yiferu, Wassie Asmamaw, Anteneh Asfaw, Hamid Mekonenn","doi":"10.1007/s10457-026-01694-2","DOIUrl":null,"url":null,"abstract":"<div><p>In parkland agroforestry, assessing the soil seed bank (SSB) provides valuable insights into the potential for natural regeneration and recovery of plant communities following disturbance. This study evaluated the composition, spatial distribution, and regenerative potential of SSB beneath and outside the canopies of <i>Acacia tortilis</i>, <i>Balanites aegyptiaca</i>, and <i>Cordia africana</i> in Southern Ethiopia. Standing understory vegetation was evaluated using 144 quadrats (1 m × 1 m), while soil samples were extracted from 0 to 20 cm and 20 to 40 cm depths for controlled seedling emergence trials. Analysis of Variance (ANOVA) revealed that seed attributes were significantly governed by a three-way interaction between tree species, canopy zone, and soil depth. Propagule pools were intensely canopy-centric; mean seed densities beneath over-story covers (28.13 seeds m<sup>−2</sup>) more than doubled those of open outside matrices (12.65 seeds m<sup>−2</sup>), with <i>A. tortilis</i> driving the highest accumulations. Vertically, severe downward attenuation occurred, with topsoil (0–20 cm) maintaining significantly higher mean densities (32.53 seeds m<sup>−2</sup>) than subsoils (8.33 seeds m<sup>−2</sup>). Out of 28 germinated species across 13 families, the SSB was overwhelmingly dominated by opportunistic herbs (46.43%) and grasses (39.29%), whereas native woody species were severely suppressed (14.29%). Furthermore, Jaccard’s index revealed a weak compositional match between the subterranean core and standing vegetation. The scarcity of woody propagules suggests that the soil seed bank alone may be insufficient for spontaneous woodland recovery in managed farmlands, particularly given that this study was conducted at a single location and evaluated only germinable seeds. Consequently, complementary active restoration strategies, such as enrichment planting and direct seeding, should be considered to support regional biodiversity and long-term agroforestry productivity.</p></div>","PeriodicalId":7610,"journal":{"name":"Agroforestry Systems","volume":"100 8","pages":""},"PeriodicalIF":3.2000,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10457-026-01694-2.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Agroforestry Systems","FirstCategoryId":"97","ListUrlMain":"https://link.springer.com/article/10.1007/s10457-026-01694-2","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"AGRONOMY","Score":null,"Total":0}
引用次数: 0
Abstract
In parkland agroforestry, assessing the soil seed bank (SSB) provides valuable insights into the potential for natural regeneration and recovery of plant communities following disturbance. This study evaluated the composition, spatial distribution, and regenerative potential of SSB beneath and outside the canopies of Acacia tortilis, Balanites aegyptiaca, and Cordia africana in Southern Ethiopia. Standing understory vegetation was evaluated using 144 quadrats (1 m × 1 m), while soil samples were extracted from 0 to 20 cm and 20 to 40 cm depths for controlled seedling emergence trials. Analysis of Variance (ANOVA) revealed that seed attributes were significantly governed by a three-way interaction between tree species, canopy zone, and soil depth. Propagule pools were intensely canopy-centric; mean seed densities beneath over-story covers (28.13 seeds m−2) more than doubled those of open outside matrices (12.65 seeds m−2), with A. tortilis driving the highest accumulations. Vertically, severe downward attenuation occurred, with topsoil (0–20 cm) maintaining significantly higher mean densities (32.53 seeds m−2) than subsoils (8.33 seeds m−2). Out of 28 germinated species across 13 families, the SSB was overwhelmingly dominated by opportunistic herbs (46.43%) and grasses (39.29%), whereas native woody species were severely suppressed (14.29%). Furthermore, Jaccard’s index revealed a weak compositional match between the subterranean core and standing vegetation. The scarcity of woody propagules suggests that the soil seed bank alone may be insufficient for spontaneous woodland recovery in managed farmlands, particularly given that this study was conducted at a single location and evaluated only germinable seeds. Consequently, complementary active restoration strategies, such as enrichment planting and direct seeding, should be considered to support regional biodiversity and long-term agroforestry productivity.
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
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