Beacon Hill Grassland Biomass and Climate Time Series

Two ASCII text files contain productivity and climate data for a chalk grassland in West Sussex, U.K. Biomass measurements from 0.25 m2 quadrats were taken at eight to ten week intervals from March 1972 to April 1973, while precipitation and temperature data span 1969 through 1993. The dataset provides multiple estimates for above-ground net primary production (ANPP), ranging from 310 to 773 g/m2/year, and was originally published by NASA in 1998.

Use Cases

• Comparing different methods for estimating above-ground net primary production (ANPP) using biomass and dead matter measurements.
• Analyzing the correlation between grassland productivity (live biomass, dead matter) and local climate variables (precipitation, min/max temperature).
• Modeling carbon content in ANPP using the provided conversion factor of 0.45 and annual net production estimates.
• Studying seasonal biomass dynamics in a chalk grassland ecosystem from high-frequency quadrat harvests.

Strengths

• Provides five distinct methodological estimates for Above-ground Net Primary Production (ANPP), ranging from 310 to 773 g/m2/year.
• Climate data covers a 25-year time series from 1969 to 1993, offering long-term context for the productivity study.
• Productivity measurements were made at high temporal resolution (8-10 week intervals) over a 14-month intensive study period.

Limitations

• Below-ground production was not measured, providing an incomplete picture of total ecosystem productivity.
• Data files are in ASCII text format, which may require parsing for modern analytical tools.
• There is a conflict in the 'last updated' metadata: one platform lists 2026-03-12 (documentation only), while another lists the original data end date of 1993-12-31.

Provenance

Source

National Aeronautics and Space Administration (NASA).

Collection Method

Above-ground live biomass and dead matter measured by harvesting 0.25 m2 quadrats; climate data from a nearby weather station.

Time Range

1969 to 1993 (climate data); intensive biomass sampling from March 1972 to April 1973.

Freshness

2026-03-12 (documentation update; data unchanged since 1998)

Geography

Beacon Hill, West Sussex, U.K. (50.92 N, -0.85 W) for grassland; Rogate Field Centre (51.01 N, -0.85 W) for climate.