地理学报 ›› 2022, Vol. 77 ›› Issue (1): 66-78.doi: 10.11821/dlxb202201005
张陈彬1,2,3,4(), 吴铎2(
), 陈雪梅5, 袁子杰2, 陈发虎1,3
收稿日期:
2021-01-04
修回日期:
2021-10-20
出版日期:
2022-01-25
发布日期:
2022-03-25
通讯作者:
吴铎(1988-), 男, 甘肃通渭人, 博士, 研究员, 中国地理学会会员(S110011633M), 主要从事气候环境变化与人类影响研究。E-mail: dwu@lzu.edu.cn作者简介:
张陈彬(1998-), 男, 浙江海宁人, 硕士生, 研究方向为全新世人—环境相互作用。E-mail: zhangchb20@itpcas.ac.cn
基金资助:
ZHANG Chenbin1,2,3,4(), WU Duo2(
), CHEN Xuemei5, YUAN Zijie2, CHEN Fahu1,3
Received:
2021-01-04
Revised:
2021-10-20
Published:
2022-01-25
Online:
2022-03-25
Supported by:
摘要:
梯田是人类几千年来利用和改造自然能力的象征,在人类社会发展中发挥了重要的作用。甘加盆地位于青藏高原东北部甘肃省夏河县,盆地内的丘陵、山麓地带分布大面积的层状梯形景观,疑似弃耕的古代梯田。本文在实地考察的基础上,基于卫星遥感资料,通过GIS手段分析发现古梯田面积为42.2 km2(约63000亩),主要分布在盆地内央曲河及其支流两侧海拔2936~3326 m间的山坡上。通过对3个古梯田剖面样品的磁化率、总有机碳/氮(TOC、TN)含量、孢粉、粒度等环境代用指标分析,同时对比具有准确年代控制的自然剖面磁化率与粒度。研究结果显示:梯田开垦于晚全新世(距今3000 a)古土壤,梯田剖面顶部25~35 cm不同于自然剖面而呈均一化的指标证实了耕作层的存在(距今约1000 a以下层位);但耕作层之上TOC、TN含量的增多,以及梯田剖面与自然剖面整体一致的指标变化趋势说明了梯田被短期利用后长期废弃;结合历史文献资料推断夏河古梯田是在北宋“弓箭手屯田”制度(1074—1125年)下开垦的;气候重建资料显示该时段温度较高、降水增加,整体有益于农业生产。本文提供了过去人类社会适应气候变化的典型案例。
张陈彬, 吴铎, 陈雪梅, 袁子杰, 陈发虎. 青藏高原东北部甘加盆地古梯田地层与年代初探[J]. 地理学报, 2022, 77(1): 66-78.
ZHANG Chenbin, WU Duo, CHEN Xuemei, YUAN Zijie, CHEN Fahu. A preliminary study of the strata and age of ancient agricultural terraces in the Ganjia Basin, northeastern Tibetan Plateau[J]. Acta Geographica Sinica, 2022, 77(1): 66-78.
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