青海省玉树州天然草地等级面积统计数据（1988，2012）

该数据集记录了1988年，2012年度青海省玉树州天然草地等级面积统计数据，数据按照天然草地等级代号分类统计，草地等的划分以草地型为基本单元，划分为优、良、中、低、劣五个等别。各等的划分标准如下：
Ⅰ等（优等）草地：优类牧草重量占60%以上；
Ⅱ等（良等）草地：良类以上牧草重量占60%以上，其他类占40%；
Ⅲ等（中等）草地：中类以上牧草重量占60%以上，其他类占40%；
Ⅳ等（低等）草地：低类以上牧草重量占60%以上，其他类占40%；
Ⅴ等（劣等）草地：劣类牧草重量占40%以上｡
草地级的划分以草地型为基本单元，按鲜草产量将全省草地划分为8级。各级标准如下：
1级草地：每公顷草地产鲜草12000k g 以上；2级草地：每公顷草地产鲜草9000kg ~ 12000kg；
3级草地：每公顷草地产鲜草6000kg~ 9000kg；4级草地：每公顷草地产鲜草4500kg ~ 6000kg；
5级草地：每公顷草地产鲜草30001kg~ 4500kg；6级草地：每公顷草地产鲜草1500kg~ 3000kg；
7级草地：毎公顷草地产鲜草750kg~ 1500kg；8级草地：每公顷草地产鲜草750kg以下。数据整理自青海省草原总站与1988年和2012年发布的《青海省草地资源统计册》。数据集包含2个数据表，分别为：玉树藏族自治州天然草地等级统计数据（1988）、玉树州天然草地等级面积统计数据（2012）。数据表结构相似。例如循化县天然草地等级面积统计数据（2012）表共有9个字段：
字段1：合计
字段2：1级
字段3：2级
字段4：3级
字段5：4级
字段6：5级
字段7：6级
字段8：7级
字段9：8级

This dataset records the statistics of natural grassland grades and their corresponding areas in Yushu Prefecture, Qinghai Province in 1988 and 2012. The data is classified and counted based on natural grassland grade codes. The classification of grassland quality grades takes grassland type as the basic unit, which is divided into five grades: excellent, good, medium, low, and inferior. The criteria for each quality grade are as follows:
1. Grade Ⅰ (Excellent): The weight of excellent-type forage accounts for more than 60%;
2. Grade Ⅱ (Good): The weight of good or higher-grade forage accounts for more than 60%, while other types account for 40%;
3. Grade Ⅲ (Medium): The weight of medium or higher-grade forage accounts for more than 60%, while other types account for 40%;
4. Grade Ⅳ (Low): The weight of low or higher-grade forage accounts for more than 60%, while other types account for 40%;
5. Grade Ⅴ (Inferior): The weight of inferior-type forage accounts for more than 40%.

The classification of grassland productivity levels also takes grassland type as the basic unit. The grasslands of the entire province are divided into 8 levels based on fresh grass yield, with the following criteria:
1. Level 1: More than 12,000 kg of fresh grass per hectare;
2. Level 2: 9,000 kg to 12,000 kg of fresh grass per hectare;
3. Level 3: 6,000 kg to 9,000 kg of fresh grass per hectare;
4. Level 4: 4,500 kg to 6,000 kg of fresh grass per hectare;
5. Level 5: 3,000 kg to 4,500 kg of fresh grass per hectare;
6. Level 6: 1,500 kg to 3,000 kg of fresh grass per hectare;
7. Level 7: 750 kg to 1,500 kg of fresh grass per hectare;
8. Level 8: Less than 750 kg of fresh grass per hectare.

This dataset is compiled from the *Statistical Compilation of Qinghai Grassland Resources* released by the Qinghai Grassland Station in 1988 and 2012. It contains two data tables: Statistical Data of Natural Grassland Grades of Yushu Tibetan Autonomous Prefecture (1988), and Statistical Data of Natural Grassland Grade Areas of Yushu Prefecture (2012). The structures of the two tables are similar. For example, the table of Statistical Data of Natural Grassland Grade Areas of Xunhua County (2012) has a total of 9 fields:
- Field 1: Total
- Field 2: Level 1
- Field 3: Level 2
- Field 4: Level 3
- Field 5: Level 4
- Field 6: Level 5
- Field 7: Level 6
- Field 8: Level 7
- Field 9: Level 8

搜集汇总

背景与挑战

背景概述

该数据集记录了1988年和2012年青海省玉树州天然草地的等级面积统计数据，按照草地等级（优、良、中、低、劣）和产量级别（1-8级）分类统计，数据以PDF格式存储，包含两个数据表，分别对应两个年份的统计数据。