Page 89 - 《广西植物》2026年第6期
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1 0 0 4                                广  西  植  物                                         46 卷
                                           1             2ꎬ3∗              1                 2ꎬ3
                          ZHANG Yaoyao ꎬ REN Qifei          ꎬ FU Hangqin ꎬ CHEN Yunfei
                ( 1. College of Forestryꎬ Guizhou Universityꎬ Guiyang 550025ꎬ Chinaꎻ 2. Guizhou Botanical Gardenꎬ Guiyang 550004ꎬ Chinaꎻ 3. Key
                           Laboratory for Biodiversity Conservation in Karst Mountain Area of Southwestern China of the National
                                       Forestry and Grassland Administrationꎬ Guiyang 550004ꎬ China )


                 Abstract: To explore the optimal fertilizing amount of nitrogen (N)ꎬ phosphorus (P) and potassium (K) for the growth
                 of Davidia involucrata seedlingsꎬ a pot control experiment was conducted with one ̄year ̄old seedlings as research object
                 and yellow brown soil as the substrate whose basic physical and chemical properties were determined. The “3414” soil
                 testing and formulated fertilization method was adopted to set three factors (Nꎬ Pꎬ K) with four levels (0ꎬ 1ꎬ 2ꎬ 3)ꎬ
                 with 14 treatments in all (T1-T14). The seedling growth and ecological stoichiometric characteristics of leaves and roots
                 under different treatments were determinedꎬ and the inter ̄treatment differences and correlation relationships of each
                 index were statistically analyzed. The results were as follows: (1) The carbon ( C) content in leaves and roots of
                 D. involucrata seedlings showed relatively small differences among all treatments. The N and P contents showed
                 significant differences (P<0.05)ꎬ and they were positively correlated with the application levels of N and P fertilizersꎬ
                 respectively. (2) The C ∶ N and N ∶ P in leaves and roots under T2 (N P K ) were unbalancedꎬ which limited the
                                                                       0  2  2
                 growth of D. involucrata seedlings. The N ∶ P ratios in leaves and roots among all treatments ranged from 4.86 to 13.65ꎬ
                 all lower than 14ꎬ indicating that the seedling growth was limited by N. (3) The leaf mass per areaꎬ total biomassꎬ plant
                 height increment and ground diameter increment were the lowest under T11 (N P K )ꎬ which were 6.78%ꎬ 32.88%ꎬ
                                                                           3  2  2
                 18.91% and 6.82% lower than those under T1 (N P K )ꎬ respectively. T13 (N P K ) had the most significant growth ̄
                                                     0  0  0               1  2  1
                 promoting effectꎬ with the above indicators being 12.39%ꎬ 82.37%ꎬ 201.75% and 120.45% higher than those under T1ꎬ
                 respectively. (4) Correlation analysis showed that leaf mass per area was significantly positively correlated with root N
                 content and N ∶ P of leaves and roots (P<0.05)ꎬ and total biomass was significantly positively correlated with root C
                 content ( P < 0. 05 )ꎬ indicating a certain correlation between growth traits and ecological stoichiometric
                 characteristics. (5) Multiple comparison results showed that N had significant effects on all growth traitsꎬ as well as root
                 C and N contents and leaf N and P contents (P<0.05). P had significant effects on leaf mass per areaꎬ plant height
                 incrementꎬ ground diameter increment and P contents of leaves and roots (P<0.05). K had a significant effect on leaf
                 mass per areaꎬ plant height increment and ground diameter increment (P<0.05). In conclusionꎬ balanced application of
                 Nꎬ P and K should be emphasized for potted D. involucrata seedlingsꎬ and excessive application of N fertilizer (7.95 g
                     ̄1
                 plant ) should be avoided due to its inhibitory effect on seedling growth. T13 (2.65 g Nꎬ 1.00 g P O ꎬ and 1.50 g K O)
                                                                                        2  5         2
                 is the optimal fertilization scheme for the growth of D. involucrata seedlings. The precise fertilization model constructed in
                 this study provides core technical support for the population propagation and natural reintroduction of D. involucrataꎬ and
                 contributes to the conservation of this endangered species resource.
                 Key words: Davidia involucrata seedlingsꎬ formula fertilizationꎬ stoichiometric characteristicsꎬ nutrient accumulationꎬ
                 plant protection




                生态化学计量学是研究生物体内关键化学元                            助于揭示养分元素与功能性状之间的相互作用ꎬ
            素的比例关系及其在生态系统能量流动和物质循                              种内化学计量比特征的变异能体现植株对环境干
            环中作用规律的一门学科ꎬ贯穿从基因到生态系                              扰的适应机制ꎬ种间变异可反映群落生态位分化
            统的多个研究维度ꎬ构建起不同生命层次间元素                              程度ꎬ对于揭示植物自身养分分配规律及其对非
            平衡的关联(Elser et al.ꎬ 2000)ꎮ 研究植物化学计                 生 物 环 境 的 适 应 机 制 策 略 具 有 重 要 意 义
            量比特征能够反映植物养分限制状态ꎬ可为植株                              (Fervández ̄Martínez et al.ꎬ 2021)ꎮ 聚焦自然群落
            施肥提供均衡指示ꎮ Meunier 等(2017) 认为ꎬ生态                    中植物生长的养分规律ꎬ借助生态化学计量方法ꎬ
            化学计量学框架与基于性状的生态学相结合ꎬ有                              有助于明确养分元素比例对植物生长的调控机制
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