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6 期                文程敬等: 云南松幼苗生长及化学计量对遮阴和干旱互作的响应                                          1 1 6 5

                       表 1  不同遮阴和干旱处理下云南松幼苗苗高、地径和生物量及生物量分配变化情况
                        Table 1  Changes in seedling heightꎬ ground diameterꎬ biomass and biomass allocation of
                               Pinus yunnanensis seedlings under different shade and drought treatments

                                                                     叶生物量      茎生物量      粗根生物量     细根生物量
                                                地径增量
                                     苗高增量                生物量增量        增量         增量        增量         增量
               遮阴水平      干旱胁迫程度                Increment of
                                     Increment of         Increment  Increment  Increment of  Increment  Increment
               Shade level  Drought stress       ground
                                    seedling height       of biomass  of leaf    stem     of coarse  of fine
                 (%)        degree              diameter
                                       (cm)                 (g)       biomass   biomass  root biomass  root biomass
                                                 (mm)
                                                                       (g)       (g)        (g)       (g)
                  0          CK      3.46±0.12a  2.53±0.17b  5.70±0.23b  1.93±0.19e  0.97±0.25d  0.23±0.17b  0.13±0.09e
                             LD      3.29±0.12a  4.53±0.17a  6.50±0.23a  5.33±0.19b  2.73±0.25a  0.77±0.17ab  1.03±0.09a
                             MD      1.74±0.12c  1.31±0.17d  4.70±0.23cd  4.17±0.19c  2.3±0.25ab  0.63±0.17ab  0.40±0.09de
                             SD      1.67±0.12c  0.30±0.17e  4.50±0.23cd  3.13±0.19d  1.23±0.25cd  0.57±0.17ab  0.57±0.09cd
                  70         CK     2.58±0.12bc  1.72±0.17cd  3.10±0.23ef  5.93±0.19a  2.17±0.25ab  0.93±0.17a  0.63±0.09bcd
                             LD      2.85±0.12b  2.46±0.17b  4.10±0.23cd  5.97±0.19a  2.43±0.25ab  0.73±0.17ab  0.90±0.09ab
                             MD      2.88±0.12b  0.68±0.17e  3.40±0.23ef  5.8±0.19ab  1.87±0.25bc  1.07±0.17a  1.00±0.09a
                             SD      2.76±0.12b  0.53±0.17e  3.20±0.23ef  6.07±0.19a  1.80±0.25bc  0.63±0.17ab  0.37±0.09de
              注: 不同字母表示同一遮阴水平下不同干旱处理间差异显著(P<0.05)ꎮ
              Note: Different letters indicate significant differences between different drought treatments at the same shade level (P<0.05).

                          表 2  不同遮阴和干旱处理下对云南松幼苗化学计量的双因素方差分析(F 值)

                              Table 2  Two ̄way ANOVA of different shade and drought treatments on the
                                      stoichiometry of Pinus yunnanensis seedlings (F value)

                                                                                          遮阴水平 × 干旱胁迫程度
                   元素                 器官                遮阴水平              干旱胁迫程度
                                                                                              Shade level ×
                  Element            Organ             Shade level      Drought stress degree
                                                                                            Drought stress degree
                   碳 C               叶 Leaf             19.092∗∗            8.600∗             14.830∗∗
                                     茎 Stem             0.350               1.432               0.085
                                  粗根 Coarse root        0.456               5.029∗              1.678
                                   细根 Fine root         1.584              10.510∗∗             1.109
                   氮 N               叶 Leaf          23 275.278∗∗        9 068.252∗∗        11 857.740∗∗
                                     茎 Stem         705 978.426∗∗       139 767.287∗∗       52 006.629∗∗
                                  粗根 Coarse root        16.332∗∗            7.757∗              2.008
                                   细根 Fine root     473 705.455∗∗     1 348 876.074∗∗      725 308.124∗∗
                   磷 P               叶 Leaf             85.056∗∗        11 058.038∗∗        23 917.182∗∗
                                     茎 Stem         458 937.563∗∗     1 056 672.690∗∗      499 956.479∗∗
                                  粗根 Coarse root     32 482.095∗∗       59 738.465∗∗        86 601.943∗∗
                                   细根 Fine root         71.799∗∗           80.279∗∗            48.486∗∗
                碳 ∶ 氮 C ∶ N          叶 Leaf             49.982∗∗           11.865∗∗            21.897∗∗
                                     茎 Stem            375.472∗∗           54.692∗∗            19.235∗∗
                                  粗根 Coarse root        85.585∗∗           32.855∗∗         86 601.943∗∗
                                   细根 Fine root         85.290∗∗           65.335∗∗            66.237∗∗
                碳 ∶ 磷 C ∶ P          叶 Leaf             94.434∗∗           167.423∗∗          323.544∗∗
                                     茎 Stem            221.072∗∗           374.286∗∗           76.985∗∗
                                  粗根 Coarse root        1.749              284.017∗∗          388.729∗∗
                                   细根 Fine root         0.651               3.268∗              2.740
                氮 ∶ 磷 N ∶ P          叶 Leaf            117.545∗∗         1 206.526∗∗         1 994.609∗∗
                                     茎 Stem       1 010 770.986∗∗       722 977.533∗∗      296 797.070∗∗
                                  粗根 Coarse root        4.529∗             24.625∗∗            13.716∗∗
                                   细根 Fine root         3.138               1.578               2.747
              注: 遮阴水平、干旱胁迫程度及其交互作用对云南松幼苗各器官的影响ꎮ ∗ 表示 P<0.05ꎻ∗∗表示 P<0.01.
              Note: Effects of shade levelꎬ drought stress degree and their interaction on each organ of Pinus yunnanensis seedlings. ∗ indicates P<
            0.05ꎻ∗∗ indicates P<0.01.
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