###### Abstract
Internationally, scholars have embarked on an extensive array of research endeavors investigating the spatial-temporal nuances, catalysts, and prospective trajectories of flash drought phenomena at global, national, and watershed scales, as well as across diverse biogeographical realms, culminating in a wealth of scholarly findings [2; 13; 14]. Predominantly, these academic inquiries have concentrated on the ramifications of flash droughs upon agriculture and ecological systems, elucidating the underlying mechanisms of their impact [3; 15]. For instance, [PERSON] and [PERSON] delineated flash droughs based on fluctuations in temperature, evapotranspiration (ET), and soil moisture throughout drought evolution [16]. They bifurcated them into two distinct categories predicated on their causative mechanisms: one category encompasses heatwave-induced droughs, primarily instigated by elevated temperatures that augment ET and diminish soil moisture levels [13]; the other encompasses precipitation deficiency droughs, principally propelled by a paucity of rainfall, which similarly escalates ET and reduces soil moisture [17]. This latter category also includes droughs arising from a synergy of decreased rainfall-induced ET and anomalous thermal elevation. In dissecting these two manifestations of flash droughs, scholars have delved into their characteristics and driving forces through empirical temperature analyses and the modeling of soil moisture and ET reconstructions [18; 19]. [PERSON] et al. leveraged meteorological data from the China Meteorological Administration (CMA) alongside reanalysis products of soil moisture data to probe into the enduring shifts and causatives of high-temperature-induced flash droughs within China, discerning that the rising trend of such droughs is predominantly linked to long-term climatic warming [20]. [PERSON] et al. ascertained that, over the preceding six decades, the incidence of droughs driven by rainfall scarcity has seen a threefold increase in southern Africa, particularly during the 2015 and 2016 rainy seasons, precipitating a diminution in ecosystem carbon sequestration exceeding 100 TgC [21]. The influence of droughs on terrestrial ecosystems has increasingly come under scrutiny in recent times. [PERSON] et al. ascertained that, within the final quarter-century (2075-2099), the detrimental impacts of drought on terrestrial ecosystems are poised to nearly triple under scenarios of both high and medium greenhouse gas (GHG) emissions [22]. Nevertheless, the precise manner and extent to which flash droughs impinge upon terrestrial ecosystems remain to be fully elucidated. Moreover, understanding the differential responses of various ecosystems to flash droughs can significantly bolster predictions regarding the evolution of ecosystems amidst global climate change, their spatial-temporal dynamics, and serve as a critical reference for formulating drought mitigation and prevention strategies. Northeast China, recognized as a region acutely sensitive to climatic vicissitudes, emerges as a crucible for drought susceptibility and a focal point for global drought research [6; 23]. The Songnen Plain (Figure 1), heralded for its quintessential black soil, stands as a pivotal agricultural nexus and a bastion of wetland biodiversity in Northeast China [24]. The trajectory of drought within this locale is inexorably linked to the imperatives of regional food security and ecological integrity. In the wake of global climate change, the area has witnessed a marked escalation in the frequency of drought episodes, exacerbatingthe ecological vulnerability of this region [25; 26]. Flash droughts, characterized by their swift onset and profound ecological ramifications, represent a formidable natural calamity. Yet, the specific ecological consequences of flash drought events on the Songnen Plain remain an enigmatic aspect of study.