青海省贵德县天然草地等级面积统计数据（1988，2012）

该数据集记录了1988年，2012年度青海省贵德县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：贵德县天然草地等级面积统计数据（2012），贵德县天然草地等级统计数据 （1988）。数据表结构相似。例如贵德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 statistical data on the area of natural grassland grades in Guide County, Qinghai Province, for 1988 and 2012. The data is classified and counted according to the codes of natural grassland grades. Grassland quality classes are divided into 5 grades (excellent, good, medium, low, poor) using grassland types as the basic unit. The classification criteria for each quality grade are as follows:
1. Grade Ⅰ (Excellent) grassland: Forage of the excellent category accounts for more than 60% of the total weight;
2. Grade Ⅱ (Good) grassland: Forage of the good category or higher accounts for more than 60% of the total weight, with the remaining forage categories accounting for 40%;
3. Grade Ⅲ (Medium) grassland: Forage of the medium category or higher accounts for more than 60% of the total weight, with the remaining forage categories accounting for 40%;
4. Grade Ⅳ (Low) grassland: Forage of the low category or higher accounts for more than 60% of the total weight, with the remaining forage categories accounting for 40%;
5. Grade Ⅴ (Poor) grassland: Forage of the poor category accounts for more than 40% of the total weight.

Grassland productivity levels are divided into 8 levels for the entire province based on fresh forage yield, using grassland types as the basic unit. The criteria for each productivity level are as follows:
1. Level 1 grassland: Fresh forage yield per hectare is above 12,000 kg;
2. Level 2 grassland: Fresh forage yield per hectare ranges from 9,000 kg to 12,000 kg;
3. Level 3 grassland: Fresh forage yield per hectare ranges from 6,000 kg to 9,000 kg;
4. Level 4 grassland: Fresh forage yield per hectare ranges from 4,500 kg to 6,000 kg;
5. Level 5 grassland: Fresh forage yield per hectare ranges from 3,000 kg to 4,500 kg (corrected from the original typo "30001kg" for logical consistency);
6. Level 6 grassland: Fresh forage yield per hectare ranges from 1,500 kg to 3,000 kg;
7. Level 7 grassland: Fresh forage yield per hectare ranges from 750 kg to 1,500 kg;
8. Level 8 grassland: Fresh forage yield per hectare is below 750 kg.

This dataset is compiled from the *Statistical Compendium of Qinghai Grassland Resources* released by the Qinghai Provincial Grassland Station in 1988 and 2012. The dataset contains two data tables, namely: Statistical Data on the Area of Natural Grassland Grades in Guide County (2012), and Statistical Data on Natural Grassland Grades in Guide County (1988). The structures of the two tables are similar. For example, the table *Statistical Data on the Area of Natural Grassland Grades in Guide County (2012)* has a total of 9 fields:
1. Field 1: Total
2. Field 2: Level 1
3. Field 3: Level 2
4. Field 4: Level 3
5. Field 5: Level 4
6. Field 6: Level 5
7. Field 7: Level 6
8. Field 8: Level 7
9. 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年青海省贵德县天然草地的等级面积统计数据，按草地等别（优、良、中、低、劣五等）和草地级（按鲜草产量划分为8级）分类统计，数据来源于青海省草原总站的《青海省草地资源统计册》，以PDF格式存储，包含两个数据表，用于分析草地资源变化。