青海省同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年度青海省同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：同德县天然草地等级面积统计数据（2012）、同德县天然草地等级统计数据（1988）。数据表结构相似。例如同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 documents the statistical area data of natural grassland grades in Tongde County, Qinghai Province for the years 1988 and 2012. The data is classified and counted according to the codes of natural grassland grades. The division of grassland quality classes takes grassland type as the basic unit, which is divided into five quality categories: Excellent, Good, Medium, Low, and Poor. The classification criteria for each quality class are as follows:
Grade Ⅰ (Excellent) grassland: Forage in the excellent category accounts for more than 60% of the total fresh weight;
Grade Ⅱ (Good) grassland: Forage in the good category and above accounts for more than 60% of the total fresh weight, with the remaining forage categories accounting for 40%;
Grade Ⅲ (Medium) grassland: Forage in the medium category and above accounts for more than 60% of the total fresh weight, with the remaining forage categories accounting for 40%;
Grade Ⅳ (Low) grassland: Forage in the low category and above accounts for more than 60% of the total fresh weight, with the remaining forage categories accounting for 40%;
Grade Ⅴ (Poor) grassland: Forage in the poor category accounts for more than 40% of the total fresh weight.
The division of grassland yield grades also takes grassland type as the basic unit, and divides the grassland of the whole province into 8 grades based on fresh grass yield. The criteria for each grade are as follows:
Grade 1 grassland: Fresh grass yield per hectare exceeds 12,000 kg;
Grade 2 grassland: Fresh grass yield per hectare ranges from 9,000 kg to 12,000 kg;
Grade 3 grassland: Fresh grass yield per hectare ranges from 6,000 kg to 9,000 kg;
Grade 4 grassland: Fresh grass yield per hectare ranges from 4,500 kg to 6,000 kg;
Grade 5 grassland: Fresh grass yield per hectare ranges from 3,000 kg to 4,500 kg;
Grade 6 grassland: Fresh grass yield per hectare ranges from 1,500 kg to 3,000 kg;
Grade 7 grassland: Fresh grass yield per hectare ranges from 750 kg to 1,500 kg;
Grade 8 grassland: Fresh grass yield per hectare is below 750 kg.
The data is collated from the *Statistical Compilation of Grassland Resources of Qinghai Province* released by the Qinghai Grassland Station in 1988 and 2012. The dataset contains two data tables, namely: Statistical Data of Natural Grassland Grade Areas in Tongde County (2012) and Statistical Data of Natural Grassland Grades in Tongde County (1988). The structures of the two tables are similar. Taking the 2012 table as an example, it has a total of 9 fields:
1. Total
2. Grade 1
3. Grade 2
4. Grade 3
5. Grade 4
6. Grade 5
7. Grade 6
8. Grade 7
9. Grade 8

搜集汇总

背景与挑战

背景概述

该数据集提供了青海省同德县1988年和2012年天然草地的等级面积统计数据，依据草地质量（五等）和产量（八级）进行详细分类，数据来源于官方统计册，以PDF格式存储，适用于草地资源管理和生态研究。