The Longji ancient agricultural terraces in the Longji Mountain area (Guilin, southern China), which still remain in use, are famous for their magnificent terraced landscape with a mix of ecosystem and human inhabitation. Previous research has revealed the genesis and preliminary paleoenvironmental record of the agricultural terraces, but little is known about variations in crop cultivation over time. In this study, organic geochemical analyses and radiocarbon dating of an aggradational cultivated soil from a terrace profile were used to explore crop type variation and relevant paleoenvironmental change during the period of cultivation on the Longji Terraces. Hydroponic farming with rice (C-3) planting has been the dominant cultivation mode since the initial construction of the terraces. Warm-dry climate contributed to the growth of drought-tolerant crop (C-4) cultivation in the late 15th century. Temperature deterioration during the Little Ice Age had a negative impact on dry and hydroponic farming activities from the late 15th century to the late 19th century, while climate warming after the Little Ice Age promoted the redevelopment of hydroponic farming. (C) 2016 Elsevier Ltd. All rights reserved.

Publication name	JOURNAL OF ENVIRONMENTAL MANAGEMENT, 202 524-531; SI 10.1016/j.jenvman.2016.11.016 3 NOV 1 2017
Author(s)	Jiang, Yongjian; Li, Shijie; Chen, Wei; Cai, Desuo; Liu, Yan
Corresponding author(s)	LI Shijie   lishijie@vip.gyig.ac.cn  -Chinese Acad Sci, Inst Geochem, 99 West Lincheng Rd, Guiyang 550081, Guizhou, Peoples R China  -Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, 73 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China

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