CO2浓度升高对杉木幼苗生长及其光合特性和养分含量的影响

以杉木优良无性系洋061幼苗为材料，设置常规C(0)浓度40 LL (对照组)和CO2加富浓度800L.1(处理组)两个处理，研究C0,浓度加富对杉木幼苗生长、根系形态特征、光合生理以及养分含量的影响以明确杉木优良无性系对CO2,浓度升高的响应特征，为彬木苗木高效培育提供理论依据。结果表明(1)CO,加富能显著促进杉木幼苗生物量的积累和苗高的生长，并显著促进杉木根系生长，其根长、根系表面积、根系体积和根系直径分别较对照增加14.60%、28.26%,4. 98%和114.70%, (2)Co,加富能促进杉木叶片类胡萝卜素含量显著增加，使杉木叶片净光合速率(P,)、胞间二氧化碳浓度(C)和水外利用效率(WUE)分别较对照显著提高51.03% 14. 13%和151.20%,并使气孔导度(G.)和蒸腾速率(T))分别显著下降58. 72%和4.00%.(3)C0)加富使杉木叶片最大荧光(F.),可变荧光(F.), PSI I潜在光化学效率PSI11实际光化学效率(4s 1)和光化学淬灭系数(gP)分别较对照显著增加11.48%11.25% 、6. 3%,20.38%和30.34%,且不同处理间差异显著，非光化学淬灭系数(NPQ)较对照显著下降21.90% (P小于0.05),但对初始荧光(F.)和I PSI1最大光化学效率无显著影响(P大于0.05), (4)CO,加富处理显著增加植株钙元素的含量，并显著降低植株磷元素的含量，研究认为，短期CO,加富处理可通过增加光合色素含量，提高叶片净光合速率和光能利用效率，进而增强叶片光合能力，同时促进根系生长，增强植物对养分吸收的能力，最终促进杉木幼苗的生长。

Using seedlings of the elite Chinese fir clone Yang 061 as experimental materials, two treatments were set: the control group with ambient CO₂ concentration of 40 LL and the treatment group with elevated CO₂ concentration of 800 L·1. This study aimed to investigate the effects of elevated CO₂ concentration on the growth, root morphological traits, photosynthetic physiology and nutrient content of Chinese fir seedlings, clarify the response characteristics of elite Chinese fir clones to elevated CO₂ concentration, and provide a theoretical basis for the efficient cultivation of Chinese fir seedlings. The results showed that: (1) Elevated CO₂ enrichment significantly promoted biomass accumulation and height growth of Chinese fir seedlings, as well as root growth. The total root length, root surface area, root volume and root diameter increased by 14.60%, 28.26%, 4.98% and 114.70% respectively compared with the control group. (2) Elevated CO₂ enrichment significantly increased the carotenoid content in Chinese fir leaves. The net photosynthetic rate (Pₙ), intercellular CO₂ concentration (Cᵢ) and water use efficiency (WUE) of leaves increased by 51.03%, 14.13% and 151.20% respectively compared with the control, while stomatal conductance (Gₛ) and transpiration rate (Tᵣ) decreased significantly by 58.72% and 4.00% respectively. (3) Elevated CO₂ enrichment significantly increased the maximum fluorescence (Fₘ), variable fluorescence (Fᵥ), potential photochemical efficiency of PSII, actual photochemical efficiency of PSII (Φ_PSII) and photochemical quenching coefficient (qP) by 11.48%, 11.25%, 6.3%, 20.38% and 30.34% respectively compared with the control, with significant differences between treatments. The non-photochemical quenching coefficient (NPQ) decreased significantly by 21.90% (P < 0.05), but had no significant effect on initial fluorescence (F₀) and maximum photochemical efficiency of PSII (P > 0.05). (4) Elevated CO₂ treatment significantly increased the calcium content of plants and significantly reduced the phosphorus content of plants. This study suggests that short-term elevated CO₂ treatment can enhance leaf photosynthetic capacity by increasing photosynthetic pigment content, improving net photosynthetic rate and light energy use efficiency of leaves. Meanwhile, it promotes root growth and enhances plant nutrient uptake capacity, ultimately promoting the growth of Chinese fir seedlings.

搜集汇总

背景与挑战

背景概述

该数据集研究了CO2浓度升高对杉木幼苗生长、光合特性和养分含量的影响。实验设置常规和CO2加富处理组，结果显示CO2加富能显著促进幼苗生物量积累、根系生长，并提高净光合速率，同时影响养分吸收（如钙元素增加、磷元素减少）。数据集为植物学领域的研究报告，旨在为杉木苗木高效培育提供理论依据。