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对生长在苏北沿海防护林不同土壤盐度下的主栽树种杨树 (欧美杨无性系 6 9杨 )进行了解剖 ,描述了杨树次生木质部结构的特征 ,测量了次生木质部的 16个数量特征 :年轮宽度 (ARW)、导管长度 (VL)、早材和晚材的导管分子面积 (VA)、导管周长 (VP)、导管直径 (VD)、导管单孔率 (PSV)、导管频率 (VF)、纤维长度(FL)、纤维宽度 (FW)、射线高度 (RH)和射线频率 (RF)。实验结果表明 ,在不同的土壤盐度胁迫下 :(1)杨树次生木质部形态特征的差别不明显 ,但是组成分子趋向于小型化。 (2 )次生木质部数量特征的变化比较明显 ,即当土壤含盐量从 0 0 36 %逐渐升高到 0 2 89% ,杨树的年轮宽度变小 ,0 91→ 0 77mm ;纤维长度和宽度的变化分别为 6 93 8→ 5 70 4 μm和 14 9→ 13 5 μm ,射线高度和频率的变化分别为 2 84 3→ 2 4 9 2 μm和 5 8 9→ 75 5mm- 2 ,表明在盐胁迫下杨树的生长受到抑制。随着盐度的增加 0 0 36 %→ 0 2 89% ,杨树导管长度减小 ,36 7 6→ 341 5 μm ;在早材和晚材中 ,导管面积变化分别为 15 75 6→ 170 3 6 μm2 和 76 0 1→ 94 7 7μm2 ,导管周长变化分别为 16 7 7→ 195 1μm和 12 0 8→ 14 3 7μm ,导管直径的变化分别为 4 1 8→ 4 3 4 μm和 2 9 1→ 33 1μm ,导管频率的变?
The main tree species Populus euphratica (Populus euramerican Poplar 69 Poplar) grown in coastal shelterbelts of northern Jiangsu Province were dissected, the characteristics of the secondary xylem structure of poplar were described, and 16 Quantitative characteristics: Annual ring width (ARW), catheter length (VL), early and late material catheter molecular area (VA), catheter circumference (VP), catheter diameter (VD), catheter PSV, Catheter frequency (VF), fiber length (FL), fiber width (FW), radiographic height (RH) and radiofrequency (RF). The experimental results show that under different soil salinity stress: (1) The morphological characteristics of the secondary xylem are not obvious, but the components tend to miniaturization. (2) The quantity of secondary xylem changed more obviously, that is, when the salinity of soil increased from 0 0 36% to 0 295%, the width of annual ring of poplar became smaller, 0 91 → 0 77mm; And their widths were 6 93 8 → 5 70 4 μm and 14 9 → 13 5 μm, respectively, and the changes in radiance and frequency were 2 84 3 → 2 492 μm and 5 8 9 → 75 5 mm 2 respectively Under salt stress, the growth of poplar was inhibited. With the increase of salinity 0 0 36% → 0 2 89%, the length of the conduit of poplar decreased 36 7 6 → 341 5 μm; in earlywood and latewood, the conduit area changes were 15 75 6 → 170 3 6 μm 2 and 76 0 1 → 94 7 7 μm 2 respectively. The changes of catheter circumference were 16 7 7 → 195 1μm and 12 0 8 → 14 3 7μm respectively. The changes of the catheter diameters were 4 1 8 → 4 3 4 μm and 2 9 1 → 33 1μm, catheter frequency change?