Absolutely dominant, with an average content of 55.40 , and also other tropical and subtropical broad-leaved forests have been discovered sporadically. Pinus may be the second dominant element, with an average content of 16.54 . Even so, highaltitude Phorbol 12-myristate 13-acetate Epigenetics coniferous forest, tropical and subtropical coniferous forest, temperate components, herbs and fern spores were all located sporadically within this zone. Also, no marine dinoflagellate cysts were identified within this zone.J. Mar. Sci. Eng. 2021, 9,six ofTropical and subtropical Temperate coniferous forest componentsig h C alti up tu re de Ts ssa co ug ce nif ae ero D a ec us id fo uo re us st Q ue rc C us ar p Al inu nu s U s lm Ev us er gr ee n Q ue rc usTropical and subtropical broad-leaved forestHerbsSediment composition0 20 40 60 80nu sve nd Si C lt la yAge (cal a BP)GSaDepth (m)raPi5 4512 10 15 39816 39976 20 25 30 35 40 20 40 20 40 20 40 60 80 20 20Figure two. Pollen concentration diagram of core ZK2, and figure of sediment composition is modified from Zhao et al. [2].four.1.2. Zone II (24.52.five m) The pollen concentration was also somewhat higher but reduce than that in zone I. Evergreen Quercus also dominated the pollen assemblage, together with the average content as high as that in zone I, reaching 52.34 . A further tropical and subtropical broad-leaved tree taxon Altingiaceae was clearly increased within this zone. The content of temperate broad-leaved pollen elevated remarkably as compared to that in zone I, and the key element was deciduous Quercus, with an average content of 17.57 . The content material of Pinus shows an obvious reduce (1.75 on average). The content material of terrestrial herbs shows a clear increase relative to that in zone I (19.05 on average), where the principle elements were Cyperaceae (7.06) and Poaceae (6.36). The aquatic herbs within this zone were a lot more abundant than these in zone I. The contents of high-altitude Decursin custom synthesis conifers, tropical and subtropical conifers, and fern spores had been also identified occasionally. However, the concentration on the freshwater phytoplanktonic remains was higher within this zone, and marine dinoflagellate cysts were located sporadically. 4.1.three. Zone III (12.5 m) The pollen concentrations in this zone have been a great deal reduced than those in zones I and II. The content from the most abundant tropical and subtropical broad-leaved pollen taxa evergreen Quercus decreased remarkably, with an average content of 12.86 . However, the contents of your other tropical and subtropical broad-leaved pollen taxon increased as in comparison with those in zones I and II, in particular the content of Myricaceae. The concentration of Pinus was a lot higher than that in zone II, with an average content material of 25.66 . The content of temperate broad-leaved pollen was decrease than those in zones I and II, with an average content of four.45 . The contents of terrestrial herbs, primarily Poaceae (12.66), Cyperaceae (8.32), and Artemisia (9.76), had been greater than those in zones I and II, with an average content of 35.87 . The content material of fern spores was 27.31 , which was also higher than these in zones I and II. The concentration of the freshwater phytoplanktonic remains was a lot decrease than that in zone II, whereas the concentrations of marine dinoflagellate cysts were slightly decrease than that in zone II.tin Fa gia gu ce M s ae o M rac yr ea O ica e le ce Pt ace ae e a Eu roc e r ar R ya ya ut Ar ace te ae m is ia C he Po no ac pod e ia C yp ae ce ae er ac e C om ae Ty po ph si t M a ae yr io ph yl lu m sp ic atAlZonelHIIIIIIumJ. Mar. Sci. Eng. 2021, 9,pared to tho.