该数据是中国冻土区划及类型图（1：1000万）（邱国庆 等，2000；周幼吾 等，2000）的数字化，采用了区划和类型双系列体系，在同一份图上同时用区划体系和类型体系来反映在各个级别上冻土形成和分布的共性与个性。
\n\n区划体系包括三个冻土大区：（1）中国东部冻土大区；（2）中国西北冻土大区；（3）中国西南（青藏高原）冻土大区。在三个大区的基础上，又进一步划分出16个区及下面的若干亚区。如表1所示。冻土区划界线的划分中，I大区和III大区的界线主要参考了李炳元（1987）的结果；II大区和III大区的界线就是青藏高原的北界，即昆仑山—阿尔金山—祁连山北侧和山麓线；I大区和II大区的界线在贺兰山—狼山一带。二级区的界线，在II大区和III大区中以地貌条件为依据进行划分，在I大区则以气温年较差A与年平均气温T的比值为主要划分依据，并考虑到各地的冻结深度。
\n\n类型体系基于冻土连续性、冻土存在的时间和季节冻结深度，划分为8个类型，各类型界线主要取自《中国冰雪冻土图》（1：400万）（施雅风 等，1988）并参考了一些新资料，而季节冻土界线则主要以气象站资料为依据。各类型的定义如下：
\n\n（1）大片多年冻土：连续系数为90%-70%
\n\n（2）大片-岛状多年冻土：连续系数为70%-30%
\n\n（3）稀疏岛状多年冻土：连续系数为<30%
\n\n（4）山地多年冻土；
\n\n（5）中深季节冻土：可能达到的最大季节冻结深度>1m；
\n\n（6）浅季节冻土：可能达到的最大季节冻结深度<1m；
\n\n（7）短时冻土：保存时间不足一个月
\n\n（8）非冻土。
\n\n根据该数据计算的中国多年冻土区面积约2.19×106km2，约占中国领土的22.83％。其中，高山多年冻土0.42×106km2，约占我国领土面积的4.39％。季节冻土面积约4.76×106km2，约占我国领土的49.6％，瞬时冻土面积约1.86×106km2，占我国领土的19.33％。
\n\n更多信息参考文献（周幼吾 等，2000）。
", "ds_source": "中国冻土区划及类型图（1：1000万）（邱国庆 等，2000；周幼吾 等，2000）
", "ds_process_way": "数字矢量化
", "ds_quality": "数据集通过严格的人工审核控制质量
", "ds_acq_start_time": "2000-01-01 00:00:00", "ds_acq_end_time": "2000-12-01 00:00:00", "ds_acq_place": "中国", "ds_acq_lon_east": 135.5, "ds_acq_lat_south": 17.766666666666666, "ds_acq_lon_west": 73.19972222222222, "ds_acq_lat_north": 53.86638888888889, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "login-access", "ds_total_size": 1225283, "ds_files_count": 3, "ds_format": "矢量", "ds_space_res": null, "ds_time_res": "", "ds_coordinate": "WGS84", "ds_projection": "Albers", "ds_thumbnail": "afa8992c-adbf-4d48-b1d2-d37bd8bfd6bd.png", "ds_thumb_from": 0, "ds_ref_way": "文章的引用 邱国庆，周幼吾，郭东信，王银学。中国冻土区划及类型图，在《中国冻土》，周幼吾、郭东信、邱国庆、程国栋，李树德 著，2000.", "paper_ref_way": "", "ds_ref_instruction": "None", "ds_from_station": null, "organization_id": "9c4867b1-5cb1-4de0-abeb-df42547bf41e", "ds_serv_man": "李红星", "ds_serv_phone": "0931-4967592", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": null, "quality_level": 3, "publish_time": "2021-01-08 10:56:25", "last_updated": "2023-08-23 16:45:12", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.Westdc.2020.674", "i18n": { "en": { "title": "Geocryological regionalization and classification map of the frozen soil in China (1:10,000,000)", "ds_format": "", "ds_source": "Permafrost division and type map of China (1:10 million) (Qiu Guoqing et al., 2000; Zhou Youwu et al., 2000)
", "ds_quality": "Data set quality control through strict manual audit
", "ds_ref_way": "The article quotes Qiu Guoqing, Zhou Youwu, Guo Dongxin and Wang Yinxue. Permafrost division and type map of China, in permafrost of China, Zhou Youwu, Guo Dongxin, Qiu Guoqing, Cheng Guodong, Li Shude, 2000", "ds_abstract": "These data are digitized for the Geocryological Regionalization and Classification Map of the Frozen Soil in China (1:10 million) (Guoqing Qiu et al., 2000; Youwu Zhou et al., 2000), adopting a geocryological regionalization and classification dual series system. The geocryological regionalization system and classification system are used on the same map to reflect the commonality and individuality of the formation and distribution of frozen soil at each level.
\nThe geocryological regionalization system consists of three regions of frozen soil: (1) the frozen soil region of eastern China; (2) the frozen soil region of northwestern China; and (3) the frozen soil region of southwestern China (Tibetan Plateau). Based on the three large regions, 16 regions and several subregions are further divided. In the division of the geocryological boundary in the frozen soil area, the boundary between major regions I and III mainly consults the results of Bingyuan Li (1987). The boundary between major regions II and III is the northern boundary of the Tibetan Plateau, which is the Kunlun Mountains-Altun Mountains-Northern Qilian Mountains and the piedmont line. The boundary between major regions I and II is in the area of Helan Mountain-Langshan Mountain. The boundary of the secondary region is divided by the geomorphological conditions in regions II and III. However, in region I, it is mainly divided by the ratio of the annual temperature range A to the annual mean temperature T, and the frozen depths of various regions are taken into consideration.
\nThe classification system is divided into 8 types based on the continuity of frozen soil, the time of existence of frozen soil and the seasonal frozen depth. The various classifications of boundaries are mainly taken from the \"Map of Snow, Ice and Frozen Ground in China\" (1:4 million) (Yafeng Shi et al., 1988) and consult some new materials, whereas the seasonal frozen soil boundary is mainly based on the weather station data. The definitions of each classification are as follows:
\n(1) Large permafrost: the continuous coefficient is 90%-70%;
\n(2) Large-island permafrost: the continuous coefficient is 70%-30%;
\n(3) Sparse island-shaped permafrost: the continuous coefficient is <30%;
\n(4) Permafrost in the mountains;
\n(5) Medium-season seasonal frozen soil: the maximum seasonal frozen depth that can be reached is >1 m;
\n(6) Shallow seasonal frozen soil: the maximum seasonal frozen depth that can be reached is <1 m;
\n(7) Short-term frozen soil: less than one month of storage time; and
\n(8) Nonfrozen soil.
\nAccording to the data, China's permafrost areas sum to approximately 2.19 × 106 km², accounting for 22.83% of China's territory. Among those areas, the mountain permafrost is found over 0.42×106 km2, which is 4.39% of the territory of China. The seasonal frozen soil area is approximately 4.76×106 km², accounting for 49.6% of China's territory, and the instantaneous frozen soil area is approximately 1.86×106 km², i.e., 19.33% of China's territory.
\nFor more information, please see the references (Youwu Zhou et al., 2000).
", "ds_time_res": "", "ds_acq_place": "China", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Digital Vectorization
", "ds_ref_instruction": " In order to respect intellectual property rights, protect the rights and interests of data authors, expand the services of data centers, and evaluate the application potential of data, data users are requested to clearly indicate the data source and data authors in the research results (including published papers, works, data products and unpublished research reports, data products, etc.) produced by using data. For data reprinted (secondary or multiple releases), the author must also indicate the source of the original data. The data set is provided by environmental and Ecological Science Data Center for West China, National Natural Science Foundation o f China (http://www.crensed.ac.cn)" } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC BY 4.0", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "ds_topic_tags": [ "冻土区划", "类型图", "冻土" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "中国", "中国区域" ], "ds_time_tags": [ 2000 ], "ds_contributors": [ { "true_name": "南卓铜 ", "email": "nztong@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "ds_meta_authors": [], "ds_managers": [ { "true_name": "南卓铜 ", "email": "nztong@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "category": "冻土" }