Coarse particulate organic matter (CPOM) and large instream wood (LW) belong to elements transported by stream flows, but their pattern of storage in nonperennial streams remains unclear, especially in the relationship with living trees and shrubs living in the active channels. This study evaluates the role of woody plants that occupy relatively wide active channels of nonperennial streams on the storage of CPOM and LW. All CPOM, LW and woody plants were inventoried along 18 transects in three mutually distinct reaches of intermittent streams in Peloponnese, Greece. We observed high variations of the CPOM (4.85 m³/ha - 15.65 m³/ha) and LW volumes (1.95 m³/ha - 13.35 m³/ha) deposited in the studied reaches with their highest abundance in the confined reach upstream of a landslide-related knickpoint. Woody plants were recognised as an important trapping element for CPOM in the case of a sufficient frequency of shrubs and trees in the active channel, which was not the case for the lowland reach with the far lowest measured basal area of the stems (1.84 m²/ha) in contrast to the other reaches (9.80 m²/ha and 6.32 m²/ha). A positive association was found between the basal area of the stems and the volume of CPOM deposits. However, the importance of woody plants in LW storage was confirmed only for the transects with abundant large trees with diameters greater than 0.1 m occupying the channel. The function of trees and shrubs not only as sources, but also as retention elements, should be carefully considered in the establishment of CPOM and LW budgets in nonperennial fluvial systems.

粗颗粒有机物（CPOM）和大型河内木材（LW）属于河流运输的元素，但它们在非多年生河流中的储存模式仍不清楚，特别是与生活在活跃河道中的活树和灌木的关系。本研究评估了占据相对较宽的非多年生溪流活跃通道的木本植物对 CPOM 和 LW 储存的作用。所有 CPOM、LW 和木本植物都在希腊伯罗奔尼撒半岛的三个相互不同的断续溪流中的 18 个样带上进行了清查。我们观察到 CPOM (4.85 m ³ /ha - 15.65 m ³ /ha) 和 LW 体积 (1.95 m ³ /ha - 13.35 m ^{3 ) 的高度变化}/ha) 沉积在研究河段中，在与滑坡相关的临界点上游的受限河段中其丰度最高。在活动河道中灌木和树木的频率足够高的情况下，木本植物被认为是 CPOM 的重要诱捕元素，而对于茎基面积最低（1.84 m ²的低地河段）则不然/ha）与其他河段（9.80 m ² /ha 和 6.32 m ²/哈）。发现茎基部面积与 CPOM 沉积量呈正相关。然而，木本植物在 LW 储存中的重要性仅在具有丰富的直径大于 0.1 m 的大树占据通道的样带中得到证实。在建立非多年生河流系统的 CPOM 和 LW 预算时，应仔细考虑树木和灌木不仅作为来源，而且作为保留要素的功能。