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榆树疏林草原曾广泛分布于我国北方农牧交错区,是科尔沁沙地、浑善达克沙地和呼伦贝尔沙地特有的原始景观,景观特征类似于热带稀树草原——萨瓦纳,乔木种类单一,草灌木植被发达,是遏制沙漠扩张的重要屏障。但目前榆树疏林的生长状况大都不良,树龄老化,自然消亡长期得不到更新,特别是种子-幼苗时期更新过程受到人为因素和自然环境的影响,使得榆树疏林生态系统处于崩溃边缘。本文基于国内主要的榆树疏林草原分布区榆树种子-幼苗更新过程研究,列举了榆树疏林种子-幼苗的分布特征以及影响其生长发育的主要因素,并且提出进行榆树种源保护、长期定位观测,开展多学科交叉研究和榆树固沙效果分析的展望,对于榆树疏林植被恢复和重建具有重要的理论价值。
Elm sparse forest grassland has been widely distributed in northern China’s farming and pastoral areas, is the Horqin sandy, Hunshandake Sandy and Hulunbeier sand unique original landscape, the landscape features similar to the savannah - savannah, arbor A single species, well-developed grass and shrub vegetation, is an important barrier to curb the expansion of the desert. At present, the growth of Ulmus pumila tree is mostly unfavorable, aging of trees and natural demise are not renewed for a long time, especially the seed-seedling renewal process is affected by human factors and the natural environment, making the Ulmus pumila forest ecosystem at the brink of collapse. Based on the research on elm seed-seedling renewal in the main elm shrub-grassland in China, the distribution characteristics of elm seedlings and seedlings and the main factors affecting its growth and development were listed. The elm tree protection and long-term observation , To carry out multidisciplinary research and cross-disciplinary study on the effect of sand fixation on elm trees has important theoretical value for the restoration and reconstruction of sparse forest vegetation in Ulmus pumila.