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Evaluating Soil-Root Interaction of Hybrid Larch Seedlings Planted under Soil Compaction and Nitrogen Loading

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Title: Evaluating Soil-Root Interaction of Hybrid Larch Seedlings Planted under Soil Compaction and Nitrogen Loading
Authors: Sugai, Tetsuto Browse this author
Yokoyama, Satoko Browse this author
Tamai, Yutaka Browse this author
Mori, Hirotaka Browse this author
Marchi, Enrico Browse this author
Watanabe, Toshihiro Browse this author
Satoh, Fuyuki Browse this author
Koike, Takayoshi Browse this author →KAKEN DB
Keywords: soil compaction
N loading
fine root
root morphology
ectomycorrhizal fungi
Issue Date: Sep-2020
Publisher: MDPI
Journal Title: Forests
Volume: 11
Issue: 9
Start Page: 947
Publisher DOI: 10.3390/f11090947
Abstract: Although compacted soil can be recovered through root development of planted seedlings, the relationship between root morphologies and soil physical properties remain unclear. We investigated the impacts of soil compaction on planted hybrid larch F-1(Larix gmeliniivar.japonicaxL. kaempferi, hereafter F-1) seedlings with/without N loading. We assumed that N loading might increase the fine root proportion of F(1)seedlings under soil compaction, resulting in less effects of root development on soil recovery. We established experimental site with different levels of soil compaction and N loading, where two-year-old F(1)seedlings were planted. We used a hardness change index (HCI) to quantify a degree of soil hardness change at each depth. We evaluated root morphological responses to soil compaction and N loading, focusing on ectomycorrhizal symbiosis. High soil hardness reduced the total dry mass of F(1)seedlings by more than 30%. Significant positive correlations were found between HCI and root proportion, which indicated that F(1)seedling could enhance soil recovery via root development. The reduction of fine root density and its proportion due to soil compaction was observed, while these responses were contrasting under N loading. Nevertheless, the relationships between HCI and root proportion were not changed by N loading. The relative abundance of the larch-specific ectomycorrhizal fungi under soil compaction was increased by N loading. We concluded that the root development of F(1)seedling accelerates soil recovery, where N loading could induce root morphological changes under soil compaction, resulting in the persistent relationship between root development and soil recovery.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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