耕地是农业生产的核心资源，而切沟的出现对耕地质量和粮食安全造成了极大威胁。切沟三维形态时空演变分析实际上是对切沟侵蚀过程的描述，明确其过程有助于耕地沟道侵蚀水土保持措施的精确布设。本研究基于无人机遥感生成的多年正射影像与精细DEM数据，对吉林省长春市九台区二道沟进行三维形态时空演变分析，通过目视解译结合辅助数据进行切沟二维参数提取，确定切沟多年间的整体发展情况；建立量化表达切沟三维形态的沟壑形态指标体系，并对二道沟最活跃的东部大沟头在2017-2021年间的三维形态变化进行分析；获取并统计了九台市气象站点在五年内降雨相关的多种指标，对典型东北薄层黑土区切沟降雨与沟道侵蚀的关系展开讨论。结果表明位于薄层黑土区的二道沟在五年间沟头范围稳定发展，沟头前进3.01m，新蚕食耕地39.57m2；沟头最大侵蚀1.56m，最大沉积1.76m，其中沟头阳坡处侵蚀情况最严重；侵蚀性降雨次数与降雨次数是影响该区域沟头扩张的主要因素。基于无人机遥感的切沟三维形态演变过程能够实现对薄层黑土区的切沟侵蚀过程的刻画，对于未来水土保持措施精细化布设具有指导作用。

Arable land is the core resource for agricultural production, and the appearance of gullies poses a significant threat to land quality and food security. The spatiotemporal analysis of gully three-dimensional morphology is essentially a representation of the gully erosion process. Understanding this process helps in the precise deployment of water and soil conservation measures for farmland channels. This study conducted a three-dimensional morphological spatiotemporal analysis of Erdao gully in JiuTai District, Changchun City, Jilin Province, based on multi-year orthophoto images and high-resolution DEM data generated from drone remote sensing. Gully two-dimensional parameters were extracted through visual interpretation combined with auxiliary data to determine the overall development of Erdao gully over several years. A system of quantitative gully morphology indicators was established, and the three-dimensional morphological changes in the most active eastern head of Erdao gully between 2017 and 2021 were analyzed. Rainfall-related indicators were collected and analyzed over five years from the JiuTai Meteorological Station, discussing the relationship between rainfall and gully erosion in a typical Northeast Black Soil Region. The results indicate that Erdao gully in the Black Soil Region area has had a stable development of the head area over five years, with the head advancing by 3.01 meters and encroaching on new arable land by 39.57 square meters. The maximum erosion of the head reached 1.56 meters, with a maximum deposition of 1.76 meters, with the most severe erosion occurring on the sunny slope of the head. The number of erosive rainfall events and the total number of rainfall events are the main factors affecting the expansion of gully heads in this region. The process of gully three-dimensional morphological evolution based on drone remote sensing can effectively depict the gully erosion process in the Black Soil Region area and provides guidance for the precise deployment of water and soil conservation measures in the future