青海省甘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年度青海省甘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：甘德县天然草地等级面积统计数据（2012），甘德县天然草地等级统计数据 （1988）。数据表结构相似。例如甘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 the statistical data of natural grassland grade and area in Gande County, Qinghai Province for the years 1988 and 2012. The data is classified and counted based on the codes of natural grassland grades. 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 grading standards for each grade are as follows:
Grade Ⅰ (excellent) grassland: the weight of excellent forage accounts for more than 60%;
Grade Ⅱ (good) grassland: the weight of good or higher-grade forage accounts for more than 60%, with the remaining 40% coming from other forage types;
Grade Ⅲ (medium) grassland: the weight of medium or higher-grade forage accounts for more than 60%, with the remaining 40% coming from other forage types;
Grade Ⅳ (low) grassland: the weight of low or higher-grade forage accounts for more than 60%, with the remaining 40% coming from other forage types;
Grade Ⅴ (inferior) grassland: the weight of inferior forage accounts for more than 40%.

The classification of grassland productivity classes also takes grassland type as the basic unit, and the grasslands of Qinghai Province are divided into 8 classes based on fresh forage yield. The standards for each class are as follows:
Class 1 grassland: fresh forage yield per hectare exceeds 12000 kg;
Class 2 grassland: 9000 kg ~ 12000 kg of fresh forage per hectare;
Class 3 grassland: 6000 kg ~ 9000 kg of fresh forage per hectare;
Class 4 grassland: 4500 kg ~ 6000 kg of fresh forage per hectare;
Class 5 grassland: 3000 kg ~ 4500 kg of fresh forage per hectare;
Class 6 grassland: 1500 kg ~ 3000 kg of fresh forage per hectare;
Class 7 grassland: 750 kg ~ 1500 kg of fresh forage per hectare;
Class 8 grassland: fresh forage yield per hectare is less than 750 kg.

The data is compiled from the *Statistical Book of Qinghai Grassland Resources* published by the Qinghai Grassland Station in 1988 and 2012. This dataset includes two data tables, namely: Statistical Data of Natural Grassland Grade and Area in Gande County (2012), and Statistical Data of Natural Grassland Grade in Gande County (1988). The structures of the two tables are similar. For example, the *Statistical Data of Natural Grassland Grade and Area in Gande County (2012)* table has a total of 9 fields:
Field 1: Total
Field 2: Class 1
Field 3: Class 2
Field 4: Class 3
Field 5: Class 4
Field 6: Class 5
Field 7: Class 6
Field 8: Class 7
Field 9: Class 8