Pollen and non-pollen palynomorph analyses of Upper Holocene sediments from Dianshan, Yangtze coastal lowlands, China: Hydrology, vegetation history and human activity

Abstract

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Human impact overwhelms long-term climate control of fire in the Yangtze River Basin since 3.0 ka BP

“…Only since the onset of the Iron Age, did rice agriculture gradually dominate the economy with the development and widespread use of iron tools, as revealed by various proxies, including pollen and charcoal, soil organic carbon, magnetic susceptibility, heavy metals and archaeological relics, from different sites around the Yangtze River Basin since about 3.0 ka BP (Figs. 1 and 7 and Table 2) (Atahan et al, 2008;Chen et al, 2009;Gao et al, 2005;Gu et al, 2013;Huang et al, 2004;Innes et al, 2019;Jiang and Piperno, 1999;Li et al, 2010Li et al, , 2013Ma et al, 2016;Ren, 2000;Wang et al, 2011;Zhu et al, 2002Zhu et al, , 2007Zhu et al, , 2010. Our study confirms that the dominant anthropogenic forcing of regional fire activity in the Yangtze River Basin did not occur until~3.0 ka BP.…”

History of Mid- and Late Holocene Palaeofloods in the Yangtze Coastal Lowlands, East China: Evaluation of Non-Pollen Palynomorph Evidence, Review and Synthesis

“…Their locations are shown on Figure 1. Results from Pingwang and Dianshan have been presented elsewhere [81,260], whereas data from Chuodun and Tianyilu have been published only in summary form [303]. A different sediment profile at Chuodun has been investigated by Long et al [317].…”

“…The pollen data from the sites in this paper have been published previously either in full [81,260] or summary form [85,303]. In this paper we concentrate on the record of non-pollen palynomorphs (NPPs), mainly comprising algal and fungal spores [304], which are much more likely to reflect in situ hydrological conditions such as water depth.…”

“…Flooding was perhaps of repeated and major type but not extreme, as the shift to more aquatic systems was not sudden, but continuous. The location of the site adjacent to the large lake Dianshan will have made it susceptible to the effects of flooding and water level rises and it may have been subsumed within the lake [81]. The concentration curves are similar to the percentage changes, suggesting stable sedimentation rates, with Volvocaceae and Gloeotrichia the most abundant assemblage components.…”

“…There were, however, periods of exception to this stable norm when major floods did occur. [146] 1321 T-1 [336] 1350 Longnan [337] 1500-1400 Dianshan [81] 1514 D2 [327] 1700 Taihu plain [332] 1710-1414 Qingpu [313] 2500 Yushan [98] 2540 YZ-1 [327] 2651 Taihu plain [332] 3110-2818 Dongjing [52] 3177-3111 Taihu plain [332] 3630 Dongjing [52] 3657-3639 Guoyuancun [303] 3795-3710 Baiwaitan [52] 4291 Maoshan [149] 4464 Banxiangchan [52] 4577 Liangzhu (LZ-1) [273] 4620 Wuguishan [338] 4630 Yangxi [30] 4700 HB3 [339] 4886 Hemudu [188] 4924-4603 Luojiang [5,311] 4940-4620 Yushan [340] 4903 Taihu plain [332] 5129-4346 Liangzhu (LZ-4) [273] 5175 Jingtoushan [341] 5200-5000 Tianluoshan [11] 5326 Yaojiang [25] 5386 Shisanzuqiao [332] 5434-5347 Tiaoxi valley [1] 5445 Xiaofengyang [52] 5517 Fengjing [52] 5680 Wuguishan [338] 5815 Hemudu [342] 6255 Jingtoushan [341] 6350-6200 Hemudu [178] 6470-6255 Wujincheng [52] 6494 Yaojiang [177] 6509 Jingtoushan [341] 6650-6500 Xinjie [221]<...>…”