Robinia pseudoacacia nectar measurements near Debrecen, Hungary (2023-2024)

This dataset contains 24-hour nectar sampling data and corresponding environmental measurements collected from individual flowers of black locust trees (Robinia pseudoacacia L.) between 2023 and 2024 in Hungary.

File name: Robinia_Nectar_23-24_HUN.xlsx

Main Components:

Timestamp & Location
- Date: Exact date and time of sampling (YYYY.mm.dd HH:MM:SS).
- Location: The study site (e.g., "Debrecen, Nagycsere").
- Tree_n: Tree ID being observed.
- Cluster_n: Flower cluster ID.
- Flowernum: Number of flowers on that cluster.
- Flower_n: Flower ID.
- Receptacle: Receptacle colour (Z = Green, P = Red).

Nectar measurements
- Nectarmg: Amount of nectar in mg measured per flower.
- Sugarconc: Sugar concentration of nectar in % (e.g., "35%") per flower.
- Sugarcontent: Estimated sugar value per flower.

Environmental parameters
- Temp: Temperature in °C (e.g., 22.9).
- Hum: Humidity in % (e.g., 51.1).
- Solarrad: Solar radiation in W/m².
- Okta: Cloud cover in oktas (0 = clear).
- Pressure: Atmospheric pressure in hPa.
- Winddir: Wind direction in degrees.
- Windspeed: Wind speed in m/s.
- Synop: Synoptic weather code (NOSIG = No significant change).
- Notes: Hungarian text — e.g., "sok virág" = "many flowers".
- S: Sky condition (e.g., sunny).
- R24, H_R24: Rainfall over past 24h (R24 = near the study site, H_R24 = nearest meteorological station).

Additional information
Nearest meteorological station WMO number: 64711.
Meteorological measurements were recorded by a local micrometeorological station located at the experimental site in Debrecen, Nagycsere.

This work has been implemented by the National Multidisciplinary Laboratory for Climate Change (RRF-2.3.1-21-2022-00014) project within the framework of Hungary's National Recovery and Resilience Plan supported by the Recovery and Resilience Facility of the European Union.