地理研究 ›› 2020, Vol. 39 ›› Issue (6): 1283-1294.doi: 10.11821/dlyj020190863

• 研究论文 • 上一篇    下一篇

基于不同分辨率影像的山区耕地细碎化评价及其尺度效应

任红玉1, 赵宇鸾1,2(), 李秀彬2, 葛玉娟1   

  1. 1. 贵州师范大学地理与环境科学学院,贵阳 550001
    2. 中国科学院地理科学与资源研究所,北京 100101
  • 收稿日期:2019-09-29 修回日期:2019-12-07 出版日期:2020-06-20 发布日期:2020-08-20
  • 通讯作者: 赵宇鸾
  • 作者简介:任红玉(1996-),女,贵州遵义人,硕士研究生,研究方向为土地资源利用与管理。E-mail: 1304253465@qq.com
  • 基金资助:
    国家自然科学基金项目(41771115);贵州省科技计划项目(黔科合平台人才[2017]5726号);教育部人文社科研究项目(18YJC850010);2015年贵州省“千”层次创新型人才资助项目(111-0317003)

Cultivated land fragmentation in mountainous areas based on different resolution images and its scale effects

REN Hongyu1, ZHAO Yuluan1,2(), LI Xiubin2, GE Yujuan1   

  1. 1. School of Geographic and Environmental Sciences, Guizhou Normal University, Guiyang 550001, China
    2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2019-09-29 Revised:2019-12-07 Online:2020-06-20 Published:2020-08-20
  • Contact: ZHAO Yuluan

摘要:

研究耕地细碎化的尺度效应对山区耕地细碎化遥感监测、耕地整治与可持续利用具有重要意义。选取贵州省坝区孙家村、丘陵区亚鱼村和山地区小坝村3个不同地貌背景的典型村为案例区,在构建细碎化测度模型基础上,量化分析0.1 m、1 m、2 m、5 m、10 m分辨率下耕地细碎化程度的尺度效应。研究结论:① 随着影像分辨率下降,不同地貌背景下的耕作地块特征有明显的尺度效应。② 不同地貌背景下的耕地细碎化程度存在差异,丘陵区的细碎化程度最高,坝区次之,山地区最低。不同影像分辨率下的耕地细碎化程度具有明显的尺度效应,3个典型村的耕地细碎化指数均呈现幂函数式下降;且不同地貌背景的耕地细碎化程度对尺度变化响应程度不同,坝区的耕地细碎化粒度响应最为强烈,丘陵区次之,山地区最弱。③ 以前1个尺度为参照计算耕地细碎化程度的损失精度时,坝区和丘陵区的耕地细碎化程度在影像分辨率由2 m变为5 m时最敏感,山地区小坝村对尺度变化的敏感度从2 m处呈现升高趋势;以基础尺度为参照时,丘陵区的耕地细碎化程度对尺度变化的敏感度最高,山地区次之,坝区最低。研究旨在为山区的耕地细碎化调查、评价以及治理提供借鉴。

关键词: 耕地细碎化, 农户视角, 尺度效应, 山区, 贵州

Abstract:

Studying the scale effect of cultivated land fragmentation is of great significance for remote sensing monitoring, remediation and sustainable use of cultivated land in mountainous areas. This paper selects three types of typical landforms with different geomorphological backgrounds as the case area, namely, Sunjia village in the dam area, Yayu village in the hilly area and Xiaoba village in the mountain area. The fragmentation measurement model is constructed to quantitatively analyze the scale effect of the degree of cultivated land fragmentation at the five resolutions of 0.1 m, 1 m, 2 m, 5 m and 10 m in Guizhou mountainous areas. The main conclusions are as follows: (1) with the decrease of image resolution, the characteristics of cultivated plots under different landscapes have obvious scale effects. (2) There are differences in the degree of cultivated land fragmentation under different geomorphological backgrounds. The fineness of the hilly area is the highest, followed by the dam area, and the mountain area is the lowest. The degree of cultivated land fragmentation at different image resolutions has obvious scale effect, and the index of cultivated farmland fragmentation in all the three typical villages show a power function decline. In addition, the degree of cultivated farmland fragmentation with different geomorphological backgrounds is different in response to scale changes. The grain size response of cultivated land in the dam area is the strongest, followed by the hilly area and that of the mountain area is the weakest. (3) With the previous scale as a reference to calculate the loss accuracy, the degree of cultivated land fragmentation in the dam and hilly areas is the most sensitive when the image resolution is changed from 2 m to 5 m, while the sensitivity of the mountain area to the scale change is increasing. When the basic scale is used as the reference, the degree of cultivated land fragmentation in the hilly area is the most sensitive to the scale change, followed by the mountain area, and the lowest is in the dam area. The study aims to provide reference for the investigation, evaluation and treatment of cultivated land fragmentation in mountainous areas.

Key words: cultivated land fragmentation, farmers' perspective, scale effect, mountainous area, Guizhou