GB/T 38757-2020 in English
VALIDSpecifications for facility agricultural microclimate observation—Heliogreenhouse and plastic tunnel
- Issued on:2020-04-28
- Implemented on:2020-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 38757-2020设施农业小气候观测规范 日光温室和塑料大棚》由TC539（全国农业气象标准化技术委员会）归口，主管部门为中国气象局。
Introduction
Interpretation of the core content of the standard
This standard systematically standardizes the entire process of microclimate observation for two types of facilities, solar greenhouse and plastic greenhouse, with the focus on:
| Observation dimensions | Requirements for solar greenhouses | Requirements for plastic greenhouses |
|---|---|---|
| Installation location | Middle of the east-west length, 2/3 of the north-south span | Center point |
| Structural parameters | Length 60-100m, span 10-12m, ridge height 3.5-5.5m | Length 40-100m, span 6-12m, ridge height 2-4m |
| Core observation elements | Air temperature, air humidity, ground temperature (mandatory) Soil moisture, radiation, CO₂ concentration (optional) | |
Key technical requirements
1. Observation equipment specifications
Equipment technical performance must meet the following requirements:
- Air temperature measurement: ±0.2℃ accuracy, -50℃~+50℃ range
- Soil moisture: ±2.5% error control under laboratory conditions
- CO₂ concentration: 1ppm resolution, 6 times/min sampling required
2. Key points for installation and maintenance
Typical case: A vegetable base in Shandong Province adopted a multi-factor automatic observation station. According to the standard requirements, the temperature sensor was installed 20 cm above the crop canopy, and the data quality was improved by 30%
Maintenance cycle recommendations:
- Clean the radiation sensor light shield every week
- Check the burial depth deviation of the ground temperature sensor every month
- Perform mandatory calibration every year
Recommendations for the implementation of the standard
1. Data quality control
A three-level calibration mechanism needs to be established:
| Calibration level | Method | Frequency |
|---|---|---|
| Equipment level | Zero/Span Calibration | Monthly |
| Data level | Extreme value threshold check | Real-time |
| Business level | Manual comparative observation | Quarterly |
2. Technology evolution direction
The main improvements of this standard compared with QX/T391-2017:
- Added Plastic Greenhouse observation specification
- Refine the CO₂ concentration sampling algorithm
- Clarify the requirements for multi-parameter calculation of soil moisture
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