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首页> 外文期刊>IAWA Journal >Direct exposure to solar radiation causes radial growth eccentricity at the beginning of the growing season in Robinia pseudoacacia
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Direct exposure to solar radiation causes radial growth eccentricity at the beginning of the growing season in Robinia pseudoacacia

机译：直接暴露于太阳辐射导致罗宾逊伪遗传群在生长季节开始时径向生长偏心

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Our study investigated the effect of stem temperature increase on xylem formation in Robinia pseudoacacia tree-trunks, caused by direct exposure to solar radiation. It is important to determine factors which may improve the concentricity of deposited wood tissue and intensify xylogenesis because a strong irregularity of wood tissue deposited in the radial direction in mature trees of R. pseudoacacia reduces the commercial value of the wood. Samples of vascular cambium along with adjacent tissues were collected from the southern (illuminated) and northern (shaded) side of tree-trunks growing in the inner and peripheral (thus exposed to direct sunlight) zones of the research plot. Sampling was performed several times during the growing season. The collected material was examined by epifluorescence microscopy and the thickness of deposited tissue comprising cambial xylem derivatives was measured. Deposition of a markedly greater amount of xylem on the southern side of tree-trunks in the peripheral zone of the plot was observed before full leaf development. Instrumental climatic data confirmed that in the early stage of the growing season, temperature on the southern side of the peripheral zone tree-trunk was higher than on the northern side. No clear response in terms of directional deposition of xylem was noticed in the inner zone trees and in peripheral zone trees after full leaf development. This study highlights the importance of temperature increase, caused by solar radiation, for R. pseudoacacia xylogenesis, which may be considered as a factor that affects the course of the radial growth before full leaf development.
机译：我们的研究通过直接接触太阳辐射引起的，研究了茎温度升高对罗宾西亚伪曲线树干的影响。确定可以改善沉积木组织的同心度并强化木瓜发育的因素是重要的，因为在R.Psuedoacia成熟树中沉积在径向上的木组织的强不规则性降低了木材的商业价值。从内在和周边的树干（被照射）和北部（被照射的）和北部（阴影）侧，在研究图的内部和外围（如此暴露于阳光下暴露于阳光）区域的树干的南部（被照射的）和北部（阴影）侧，从南部（发光）和北部（阴影）侧。在不断增长的季节期间，取样几次进行。通过离荧光显微镜检查收集的材料，并测量包含粘合蛋白衍生物的沉积组织的厚度。在全叶发育之前，观察到在图中围绕图中的周边区域的树干的南侧沉积明显大量的木质。仪器气候数据证实，在生长季节的早期阶段，周边树干南侧的温度高于北侧。在全叶发育后，在内部区域树木和周围区域树木的定向沉积方面没有明确的反应。本研究强调了由太阳辐射引起的温度升高的重要性，对于伪辐射，对于伪血清发生，这可能被认为是影响全叶发育前径向生长过程的因素。

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