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植被控制对人工更新紫椴幼树根系性状的影响
杨立学, 刘士林, 付瀚萱, 周思雨, 刘会锋, 申方圆
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植被控制对人工更新紫椴幼树根系性状的影响
)Effects of Vegetation Control on Root Traits of Artificial Regeneration of Tilia amurensis Saplings
)全光条件下紫椴（Tilia amurensis）更新困难，植被控制通过改变光照条件和土壤质量能够促进目的树种生长，研究植被控制强度对紫椴幼树根系性状和土壤因子的影响，为紫椴人工林培育提供支撑。以株行距为1.5 m×1.5 m的紫椴人工林（5年生）为对象，设置不同植被控制强度：幼树半径75 cm内所有灌草去除（T75）、半径50 cm范围灌草去除（T50）、半径30 cm范围灌草去除（T30）和不去除灌草（CK），测定不同植被控制强度下紫椴幼树吸收根和运输根的形态学性状、全量养分和非结构性碳水化合物等指标及土壤理化性质，揭示植被控制对根系性状和土壤因子的影响。植被控制显著改变了紫椴幼树所处环境中光照强度，其中，T75处理下光照强度最大，光照强度随着植被控制强度减弱而显著降低（P<0.05）。植被控制均显著降低了土壤全碳、全氮、速效氮和有效磷含量。随着植被控制强度的减弱，细根的直径、碳磷比、可溶性糖和淀粉含量均减小，比表面积、比根长、全碳、全氮和全磷含量均增加。土壤因子对紫椴幼树吸收根和运输根根系性状的变异的解释度分别为43.2%和37.9%。植被控制强度越大，紫椴幼树获得的光照强度越大，紫椴幼树根系形态、化学计量和生理特征随植被控制强度的变化均发生适应性改变，通过提高紫椴根系比表面积、比根长、全碳、全氮和全磷含量以增强幼树对低光条件的适应。植被控制强度变化下光照条件和土壤因子的改变可能是解释紫椴幼树根系性状变化的两个主要因素。
Since the regeneration of Tilia amurensis is difficult under full light conditions， and vegetation control can promote the growth of target species by changing light conditions and soil quality. In order to provide the support for the cultivation of T. amurensis， the effects of vegetation control intensity on root traits and soil factors of seedlings were investigated. T. amurensis monocultures（Five-year-old） with inter-row and intra-row spaces of 1.5 m×1.5 m were used as materials， and vegetation control treatments with different intensities T30， T50 and T75（clearing vegetation in the radius of 30， 50， 75 cm around T. amurensis seedlings） and control treatment（CK） were set. The morphological traits， total nutrient content， and non-structural carbon content in the absorptive roots and transport roots of T. amurensis seedlings， as well as soil variables were measured under different treatments， and the effects of vegetation control on root traits and soil conditions were revealed. Vegetation control significantly changed the light intensity in the environment of T. amurensis seedlings， among which the light intensity under T75 treatment was the maximum， and the light intensity decreased with the weakening of vegetation control intensity（P<0.05）. Vegetation control significantly reduced the contents of total carbon， total nitrogen， available nitrogen， and available phosphorus in the soil. With the decrease of vegetation control intensity， the fine root diameter， carbon to phosphorus ratio， soluble sugar and starch contents decreased， while the specific surface area， specific root length， total carbon， total nitrogen and total phosphorus contents increased. Soil variables factors to the variation of root traits for absorptive roots and transport roots were 43.2% and 37.9%， respectively. The greater the vegetation control intensity， the greater the light intensity obtained by T. amurensis saplings， and the root morphology， stoichiometry and physiological traits of T. amurensis saplings took adaptive changes with the change of vegetation control intensity. The root specific surface area， specific root length， total carbon， total nitrogen and total phosphorus contents were increased to enhance the adaptability to low light conditions. The changes of light conditions and soil factors under vegetation control might be the two main factors to explain the root trait changes of T. amurensis saplings.
紫椴 / 幼树 / 根系 / 植被控制 / 形态特征 / 生理特征
Tilia amurensis / seedlings / roots / vegetation control / morphology / physiology
S792.36
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