地理科学进展 ›› 2012, Vol. 31 ›› Issue (10): 1318-1325.doi: 10.11820/dlkxjz.2012.10.009

• 模型与方法 • 上一篇    下一篇

整合已有土壤样点的数字土壤制图补样方案

张淑杰1,2, 朱阿兴1,3, 刘京3, 杨琳1   

  1. 1. 中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室, 北京100101;
    2. 中国科学院研究生院, 北京100049;
    3. 美国威斯康星大学麦迪逊分校地理系, 麦迪逊, WI53706
  • 收稿日期:2012-01-01 修回日期:2012-05-01 出版日期:2012-10-25 发布日期:2012-10-25
  • 作者简介:张淑杰(1983-),女,山东德州人,博士研究生,主要从事数字土壤制图及样点设计研究。E-mail:zhangsj@lreis.ac.cn
  • 基金资助:

    国家自然科学基金项目(40971236, 41023010, 41001298);科技部国际科技合作项目(2010DFB24140)。

An Integrative Sampling Scheme for Digital Soil Mapping

ZHANG Shujie1,2, ZHU Axing1,3, LIU Jing3, YANG Lin1   

  1. 1. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Department of Geography, University ofWisconsin-Madison, Madison, WI53706, USA
  • Received:2012-01-01 Revised:2012-05-01 Online:2012-10-25 Published:2012-10-25

摘要: 我国多数地区经过两次土壤普查以及科研工作者的野外调查, 积累了一定数量的土壤样点“( 已有样点”)。本文在充分整合已有样点的基础上, 提出了逐次、高效地设计补充样点的方案, 它包括3 个步骤:首先, 确定已有样点集的空间代表范围“( 可推测范围”);然后, 将已有样点集不能代表范围内的每一个栅格都看作一个候选样点, 计算每一个候选样点的可扩推范围, 选择可扩推范围最大的点作为第一个补充样点;最后, 基于已有样点和补充样点更新样点集的空间代表范围图。重复以上过程, 直至新样点集的空间代表范围能够覆盖整个研究区。该方法在充分利用已有样点资源的基础上, 不仅能够确定补充样点的数量、位置, 而且能够给定补充样点的重要性次序, 在采样资源有限的情况下, 为采样者合理地选择样点提供了重要依据。

关键词: 个体代表性, 全局代表性, 推理不确定性, 已有样点, 逐次补样方案

Abstract: In most areas there exist some soil field samples “( existing samples data”) which were accumulated through two historical soil surveys and/or specific field studies. The accuracy of soil property map predicted based on this kind of samples is lower, because the size of these samples is limited and the global representativeness is poor. However, these samples are valuable resource because they do capture the relationship between soil and environment conditions. This paper presents a stepwise and effective method to design additional samples by integrating existing samples. The aim of the method is to design as few additional samples as possible to complement the global representativeness of the existing samples and improve the accuracy of predictive soil mapping. The detail process is as follows. First, we determine the spatial extent which can be represented by the existing samples. Second, each location (grid) can be considered as a candidate for additional sampling in the area which the existing samples do not cover and the area which can be covered by each candidate was then calculated. Third, the location which can represent the largest additional area was chosen as the first additional sample. Finally, the above procedure was iterated until the new sample set covered the whole study area. This integrative sampling scheme can not only determine the number and the locations of additional samples, but also give the order of the samples. It provides samplers with the important information on how many points can be sampled reasonably when the available resources are limited.

Key words: existing samples, global representativeness, individual representativeness, prediction uncertainty, stepwise additional sampling designing scheme