Effects of nitrogen forms on adaptive strategies of Moso bamboo seedlings under low-phosphorus conditions

作者：Wenhui Shi, Kecheng Wang, Jianfei Zhou, Rui Xiong, Yeqing Ying · 发表于：Advances in Bamboo Science · 年份：2025 · DOI：10.1016/j.bamboo.2025.100133 · 被引用次数：3 · 研究领域：Seedling growth and survival studies、Plant nutrient uptake and metabolism、Growth and nutrition in plants

Soil phosphorus loss frequently occurs in subtropical regions, leading to extremely low phosphorus levels in forest soils. This deficiency adversely affects soil fertility and hampers normal plant growth. Nitrogen fertilization can enhance phosphorus uptake under certain conditions. However, further research is needed to determine whether N fertilization under low-phosphorus conditions can improve P use efficiency, and to identify the most effective N form to achieve this purpose. This study explored the relationship between soil nutrient dynamics and seedling physiology, evaluating the effects of various nitrogen fertilizers on the growth of Phyllostachys edulis seedlings under low phosphorus conditions. A two-year pot experiment was conducted using four different forms of nitrogen (NO 3 - -N, NH 4 + -N, NO 3 - -N + NH 4 + -N, and organic-N) under two phosphorus treatment levels (deficient: 5.0 mg kg⁻¹ and sufficient: 20.0 mg kg⁻¹). Low phosphorus levels altered the nutrient environment of substrates and inhibited bamboo seedling growth, while increasing phosphorus distribution in the plant. Low phosphorus stress inhibited growth and altered amino acid composition. However, seedlings adapted through adjustments to the root-to-shoot ratio, modifications to root morphology, and coordination of the transport and distribution of nitrogen and phosphorus among roots, stems and leaves. This enhanced leaf electron transfer efficiency and redistributed nutrient resources. Furthermore...