Nonstructural carbohydrates (NSCs) are a key factor in the physiological regulation of plants and can reflect buffering capacity of plants under diverse environmental conditions. The effects of diverse environmental conditions on plant NSCs and tissue or organ scales have been thoroughly studied, but their effects on fine root (root diameter < 2 mm) NSC concentrations are still not completely understood. Our aims were to explore the synergistic fluctuations in root traits and NSC concentrations under diverse environmental conditions. This study was conducted on two-year-old temperate seedling tree species (Juglans mandshurica Maxim., Fraxinus mandshurica Rupr., and Phellodendron amurense Rupr.) with different drought intensities and soil substrates. The specific root length (SRL) and specific root surface area (SRA) were significantly affected by drought intensities and soil substrates, while the root tissue density (RTD) and average diameter (AD) were not significantly affected by water intensities and soil substrates in all three species. The root C, N, and P concentration did not change according to drought stress but were significantly affected by the soil substrates in all three species. Similarly, the soluble sugar (SS) and starch (ST) concentrations were significantly affected by both the drought stress and the soil substrates in all three species. The AD explained 6.8% of the total variations in soluble sugar, while the SRL explains 32.1% of the total variation in starch. The root tip C, N, and P concentrations were not significantly correlated with NSCs under different treatments. The total variations in root tip morphology, chemistry, and NSC concentrations are greater among species than compared to different drought intensities and soil substrates. However, the root NSC concentrations were closely related to root morphological traits (SRL and AD) rather than chemical traits. On the basis of different soil resources, the species with thinner diameters have higher SS concentrations, while those of a thicker diameter have higher ST concentrations.

中文翻译：

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根性状决定三种温带树种在不同干旱强度和土壤基质下非结构性碳水化合物（NSCs）的变化

非结构性碳水化合物（NSC）是植物生理调节的关键因素，可反映植物在各种环境条件下的缓冲能力。已经深入研究了各种环境条件对植物NSC和组织或器官规模的影响，但它们对细根（根直径<2 mm）NSC浓度的影响仍未完全了解。我们的目的是探索在不同环境条件下根性状和NSC浓度的协同波动。这项研究是针对两岁的温带苗木树种（胡桃木，水曲柳和黄柏）进行的。Rupr。）具有不同的干旱强度和土壤基质。干旱强度和土壤基质对比根长（SRL）和比表面积（SRA）有显着影响，而水分强度和土壤基质对根组织密度（RTD）和平均直径（AD）没有显着影响。这三个物种。根的C，N和P浓度并未根据干旱胁迫而改变，但在所有三个物种中均受到土壤基质的显着影响。同样，这三个物种的干旱胁迫和土壤基质均显着影响可溶性糖（SS）和淀粉（ST）的浓度。AD解释了可溶性糖总变异的6.8％，而SRL解释了淀粉总变异的32.1％。根尖C，N P和P浓度在不同处理下与NSCs无显着相关性。与不同的干旱强度和土壤基质相比，物种间根尖形态，化学和NSC浓度的总变化更大。但是，根中NSC的浓度与根的形态性状（SRL和AD）密切相关，而不与化学性状密切相关。根据土壤资源的不同，直径较小的物种具有较高的SS浓度，而直径较大的物种具有较高的ST浓度。根中NSC的浓度与根的形态性状（SRL和AD）密切相关，而不与化学性状密切相关。根据土壤资源的不同，直径较小的物种具有较高的SS浓度，而直径较大的物种具有较高的ST浓度。根中NSC的浓度与根的形态性状（SRL和AD）密切相关，而不与化学性状密切相关。根据土壤资源的不同，直径较小的物种具有较高的SS浓度，而直径较大的物种具有较高的ST浓度。