滇中地区火烧迹地恢复初期土壤种子库与地上植被的关系

Relationship Between Soil Seed Bank and Aboveground Vegetation in Early-Stage of Post-Fire Recovery Sites in Central Yunnan,China

  • 摘要: 为探讨火烧迹地恢复初期土壤种子库与地上植被的关系,本研究以滇中地区自然恢复1 a的火烧迹地为研究对象,采用野外采样、植被调查及种子萌发试验,分析不同层次土壤种子库物种组成及储量、地上植被物种组成及重要值,探讨地上植被物种组成、更新方式及其与不同层次土壤种子库物种组成关系。结果表明:①土壤种子库种子储量和物种数随土层加深而递减,表现为凋落物层>0—2 cm土层>2—5 cm土层>5—10 cm土层。各土层中,均以菊科(Asteraceae)和酢浆草科(Oxalidaceae)为优势科,均以酢浆草(Oxalis corniculata)为优势种;茄科(Solanaceae)龙葵(Solanum nigrum)仅在凋落物层占优势;除5—10 cm土层外其余土层均以野茼蒿(Crassocephalum crepidioides)为优势种;②地上植被共记录灌木20种、草本11种,灌木层以萌蘖更新方式为主,碎米花(Rhododendron spiciferum)(重要值55.75%)为优势种;草本层以实生苗更新为主,蕨菜(Pteridium aquilinum)(重要值90.10%)和野茼蒿(重要值85.90%)为共优种;③土壤种子库凋落物层、0—2 cm土层与地上植被中等不相似,2—5 cm土层、5—10 cm土层与地上植被极不相似;④地上植被以萌蘖更新为主,大多尚未开花结实,土壤种子库与地上植被物种组成相似性低。因此,建议火灾后管理应优先保护萌蘖更新植株及其地下芽库,并减少人为干扰对凋落物层的破坏,保障土壤种子库的持续输入与地上植被的快速恢复能力。

     

    Abstract: To explore the relationship between soil seed banks and aboveground vegetation during early-stage of the restoration of burned areas.This study employed field sampling and surveys,combined with seed germination experiment,to investigate the species composition,seed storage of soil seed banks at different layers in naturally restored burned areas for one year.It also examined the species composition and importance values of aboveground vegetation,analyzing the regeneration modes of aboveground vegetation species and their similarity to the species composition of soil seed banks at different layers.①The seed reserves and number of species in the soil seed bank decrease with depth from the litter layer,0—2 cm,2—5 cm and 5—10 cm layers.The litter layer,0—2 cm,2—5 cm and 5—10 cm layers are dominated by the Asteraceae and Oxalidaceae families,with Oxalis corniculata as the dominant species.Solanum nigrum of the Solanaceae family is only dominant in the litter layer.Except for the 5—10 cm soil layer,Crassocephalum crepidioides is the dominant species in all other soil layers.②A total of 20 shrub species and 11 herbaceous species were recorded in the aboveground vegetation.The shrub layer primarily relies on vegetative regeneration,with Rhododendron spiciferum(importance value 55.75%)as the dominant species.The herbaceous layer is mainly composed of seedlings,with Pteridium apuilinum(importance value 90.10%) and Crassocephalum crepidioides(importance value 85.90%) as co-dominant species.③The soil seed bank shows moderate dissimilarity between the litter layer and 0—2 cm layers and the aboveground vegetation,while the 2—5 cm and 5—10 cm layers exhibit extreme dissimilarity with the aboveground vegetation.④The aboveground vegetation is primarily vegetatively regenerated,with most species not yet flowering or fruiting.The soil seed bank exhibits low similarity in species composition with the aboveground vegetation.Therefore,post-fire management should prioritize the protection of sprouting and regenerating plants along with their underground seed reserves,while minimizing human interference with the litter layer to ensure continuous input of soil seed banks and rapid recovery of aboveground vegetation.

     

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