中文摘要：

为明确食叶害虫对林木幼苗生长和叶绿素含量的影响，以山乌桕1年生苗木为试材，用人工剪叶模拟虫害的方法进行失叶处理，开展了不同失叶程度下山乌桕幼苗生理和生长形态指标的测定、比较和分析。结果表明：不同程度的失叶率对山乌桕苗木生长形态的影响显著，苗高随着失叶程度的增加而先增加后降低，地径和全株叶面积随着失叶程度的增加而总体降低，叶长、叶宽和单叶面积随失叶程度的增加也增加；不同程度失叶处理的山乌桕苗木与CK植株之间生物量差异显著，而各失叶处理间植株生物量差异不显著；叶绿素含量中，叶绿素a的含量要显著高于叶绿素b的含量，各失叶处理山乌桕的叶绿素含量均有不同程度的升高。研究结果可为准确评估食叶害虫不同危害程度对山乌桕林生长影响、森林灾害评估和病虫害控制提供依据。

英文摘要：

Effects of clear leaf eating pest of forest tree seedling growth and chlorophyll content, using Sapium discolor la seedlings as test materials, using artificial clipping leaf simulated insect pest of defoliation treatment, carried out in different leaf loss degree down Sapium seedlings growth and physiological morphological indexes were measured, compared and analyzed. The results showed that： the different degrees of leaf loss rate of Sapium seedlings growth morphology has a significant effect on the seedling height along with the loss of leaves increased with increased first and then decreased, size and whole plant leaf area with the loss of the extent of leaf increased and decreased overall, leaf length, leaf width and leaf area increased; different degrees of defoliation treatment of Sapium seedlings and plant biomass, and the loss of leaf processing plant biomass did not differ significantly; the content of chlorophyll, chlorophyll a content was significantly higher than that of chlorophyll b content, the loss of leaves of Sapium discolor the chlorophyll content had different degrees of increase. Research results can be used for the accurate assessment of leaf eating pests with different level of damage on the hill ofSapium sebiferum forest growth effect, forest disaster assessment and pest damage control to provide a basis.