Spectra structures of altitudinal belts and their significance for determining the boundary between warm temperate and subtropical zones in the Qinling-Daba Mountains
ZHAO Fang1, ZHANG Baiping,2,3, ZHU Lianqi1, YAO Yonghui2, CUI Yaoping1, LIU Junjie11. College of Environment and Planning, Henan University, Kaifeng 475004, Henan, China 2. State Key Laboratory of Resource and Environment Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China 3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
National Natural Science Foundation of China.41601091 Scientific Research Start-up Funding of the Program Supporting Special Talent Zone (Henan University, to Zhaodong Feng) Integrated Scientific Investigation of the North-South Transitional Zone of China.2017FY100900 Scientific Promotion Funding of the Prioritized Academic Discipline (Geography, Henan University)
作者简介 About authors 赵芳(1984-),女,河南三门峡人,博士,讲师,主要从事山地地理、山地生态环境研究E-mail:zhaofang84@163.com。
Abstract The Qinling-Daba Mountains, as the north-south transition zone of China and the watershed between the Yellow River and the Yangtze River, are characterized by multi-dimensional and high-degree heterogeneity and variations in climate and landscape. Especially, the spectra of altitudinal belts show outstanding areal differentiation in the study region and could be considered to serve as a criterion for determining the boundary between warm temperate and subtropical zones in the Qinling-Daba Mountains. This paper designs a digital integrated system for 33 spectra of altitudinal belts in the study region and analyzes their structures and the spatial patterns of the main altitudinal belts from north-south, from west-east and with exposures. The results show that: (1) From south to north, the basal belt gradually transfers from subtropical evergreen broadleaved forest to warm temperate deciduous broadleaved forest; the spectra of altitudinal belts change from complex to simple; the dominant belt changes from mixed broadleaf-conifer forest and evergreen-deciduous broadleaved mixed forest, and then to deciduous broadleaved forest belt; and the upper limit of the evergreen-deciduous broadleaved mixed forest decreases from 1600-2000 m in the Daba Mountains to 700-800 m in the Xunhe Basin of the Qinling Mountains. (2) From west to east, the structures of altitudinal belt spectra show a complex pattern in the eastern and western sections but a simple one in the middle section; the upper limits of both evergreen-deciduous broadleaved mixed forest belt and mountain deciduous broadleaved forest belt present a quadratic curve distribution pattern in longitude direction; however, the upper limit of mountain broadleaf-conifer mixed forest belt exhibits a nearly linear decrease in west-east direction from 2700 m to 2000 m in the Qinling Mountains and from 3300 m to 1600 m in the Daba Mountains. (3) In the Qinling Mts., the basal belt is just warm temperate deciduous broadleaved forest both in the northern and southern flanks, with only some evergreen trees mixed in the basal belt in the southern flank; while in the Daba Mts., the basal belt is evergreen-deciduous broadleaved mixed forest in the northern flank and evergreen broadleaved forest belt in the southern flank. The north flanks of the Qinling and Daba Mountains have similar dominant belts, namely, mountain broadleaf-conifer mixed forest belt or mountain deciduous broadleaved forest belt. However, the southern flank of the Daba Mountains has its own unique dominant belt, i.e., evergreen-deciduous broadleaved mixed forest belt. This implies that the Daba Mountains are more appropriate than the Qinling Mountains to act as the boundary between subtropical and warm-temperate zones in central China. Keywords:Qinling-Daba Mountains;mountain altitudinal belt;latitude;longitude;quadratic curve
PDF (2567KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 赵芳, 张百平, 朱连奇, 姚永慧, 崔耀平, 刘俊杰. 秦巴山地垂直带谱结构的空间分异与暖温带—亚热带界线问题. 地理学报[J], 2019, 74(5): 889-901 doi:10.11821/dlxb201905004 ZHAO Fang. Spectra structures of altitudinal belts and their significance for determining the boundary between warm temperate and subtropical zones in the Qinling-Daba Mountains. Acta Geographica Sinice[J], 2019, 74(5): 889-901 doi:10.11821/dlxb201905004
Fig. 4Latitudinal distribution of the upper limits of mountain deciduous broad-leaved forest belt (a) and mixed broad-leaved-conifer forest belt (b) in the Qinling-Daba Mountains
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