The hydrological conditions of a lake system strongly influence the reservoir effect in the radiocarbon dating of endogenic organic and inorganic carbon in lake sediments. In this paper, we compare ¹⁴C dating with varve counting results for cores from Kusai Lake to determine the temporal changes in ¹⁴C reservoir ages during the last 2000 years. Based on the ¹⁴C budget equation for a lake system, the characteristics of geomorphology, topography, and river systems in the catchment, and the physical and chemical properties of modern water in Kusai Lake, the hydrological conditions and the reservoir effect age are discussed. The reservoir age of the sediment core from northwestern Kusai Lake (i.e., deep water area) fluctuates slightly between 2980 and 3310 years, while that from southeastern Kusai Lake (i.e., shallow water area) fluctuates greatly between 3130 and 4010 years. Under the relatively steady conditions of atmospheric ¹⁴C levels for the past 2000 years, the ¹⁴C level in the dissolved inorganic carbon (DIC) of Kusai Lake is mainly related to carbon influxes from river and glacial meltwater and carbon outfluxes in lake water. The water in the shallow water area is more affected by the Kusai River, glacier meltwater, and lake outflow than the water in the deep water area, which has caused larger temporal changes in the radiocarbon reservoir ages in the shallow water area than in the deep water area during the last 2000 years.

湖泊系统的水文条件极大地影响了湖泊沉积物中内生有机碳和无机碳放射性碳测年的储层效应。在本文中，我们将¹⁴ C测年与古西湖岩心的valve计数结果进行了比较，以确定最近2000年中¹⁴ C储层年龄的时间变化。基于¹⁴讨论了湖泊系统的C预算方程，流域的地貌，地形和河流系统的特征，以及库塞湖现代水的理化特性，水文条件和水库作用年龄。在2980年至3310年之间，来自西北关西湖（即深水区）的沉积物岩心的储集期略有波动，而在3130年至4010年之间，从库塞湖东南部（即浅水区）的沉积物岩心有很大的波动。在大气的相对稳定的条件下^14个C水平在过去2000年中，¹⁴库塞湖的溶解性无机碳（DIC）中的碳水平主要与河流和冰川融水的碳流入以及湖水中的碳流出有关。浅水区的水比深水区的水受库赛河，冰川融水和湖泊流出的影响更大，这导致浅水区的放射性碳储集期的时间变化大于深水区的最近2000年的水域面积。