林窗干扰对胡杨荒漠河岸林更新与演替的影响

林窗是森林生态系统中常见的小尺度干扰类型，是森林生态系统自然更新与演替的驱动力，对植物侵入、种子萌发、幼苗定居与幼龄树种生长发育具有促进作用，有助于森林生态系统的健康发展与可持续管理。本项目依托申请团队多年的研究成果（NSFC:30760050,31360200）和发现的新问题、新思路，以塔里木河流域荒漠河岸林林窗干扰为研究对象，基于森林生态学、地统计学、地信与遥感等学科理论与方法，结合野外观测、机载LiDAR和模型模拟等研究手段，对不同水文（地表水、地下水、人工调水）条件下胡杨林林窗时空分布格局进行定量研究；探明林窗微环境（水、土、气）对幼苗发生发育的影响；预测河岸林林窗发生地与发生时间及其周转率，评价不同水分胁迫下植被更新与演替对胡杨林林窗干扰的响应。研究成果有助于了解塔里木河流域荒漠河岸林自我更新与演替规律，为干旱区荒漠河岸林资源保育与可持续管理提供科学支撑。

Canopy gap is a common type of small-scale disturbances in the forests. As a driving force for natural regeneration and succession of forests, forest gap disturbances have an effect on plant invasion, seed germination, seedling settlement, and development of young tree species, which contributes to the healthy development and sustainable management of forest ecosystems. The project would build on the long-term terrestrial investigation and research results of the former research projects (NSFC: 30760050, 31360200) and new research ideas to target the gap disturbance of desert riparian forests along the middle and lower reaches of the Tarim River as a research objective, based on forest ecology, geo-statistics, remote sensing and GIS and other disciplines, combined with field observations, UAV LiDAR and mathematical model simulations, quantifies the spatial and temporal gap distribution patterns of Populus euphratica Oliv. under different hydrological conditions (surface runoff, groundwater, and artificial water transfer); Analyses the influence of micro-environment (water, soil and climate) on the development of seedlings; Predicts the place and occurrence time and turnover rate of riparian forest gaps, and evaluates the response of vegetation regeneration and succession to disturbance of Populus euphratica forest gap under different water stress. The research results would be helpful for understanding the rule of self-regeneration and succession of desert riparian forests in the Tarim River Basin, and provide scientific support for the sustainable management of natural desert riparian forests in arid regions.