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Home > Activities > TOPC > UNFCCC ECVs > T11 Leaf Area Index (LAI)

ECV T11 Leaf Area Index (LAI)
T1-River | T2-Water Use  | T3-Ground Water | T4-Lake | T5-Snow | T6-Galciers |
T7-Frost | T8-Albedo | T9-Land | T10-fAPAR | T11-LAI | T12-Biomass | T13-Fire |

Introduction

Leaf Area Index (LAI) measures the amount of leaf material in an ecosystem, which imposes important controls on photosynthesis, respiration, rain interception, and other processes that link vegetation to climate. Consequently, LAI appears as a key variable in many models describing vegetation-atmosphere interactions, particularly with respect to the carbon and water cycles (GCOS, 2004). The interest in information on LAI distribution and changes has grown substantially in recent decades, due to its intrinsic importance and the emerging capability for LAI estimation over large areas using satellite measurements.

ECV LAI standards report

As requested by UNFCCC SBSTA/COP for its 23rd Session in Montreal, November 2005, GTOS is undertaking the assessment of the status of the development of standards for each of the essential climate variables in the terrestrial domain. The following report, documentation and other material have been compiled for Leaf area index. We very much welcome your comments and inputs in improving and completing the analysis for biomass. Please send any material and comments to the GTOS Secretariat.

T11rep

Download report PDF, 0.94 Mb, 1 November 2009

References

Listed below are the major references that have been identified in regards to methodology and standards for leaf area index. Please inform us if you are aware of any other documentation or material which could be considered.

Breda, N.J. 2003. Ground-based measurements of leaf area index: a review of methods, instruments and current controversies. Journal of Experimental Botany 54: 2403-2417.

GCOS. 2004. Implementation plan for the Global Observing System for Climate in support of the UNFCCC. Report GCOS – 92 (WMO/TD No. 1219). 136p.

Jonckheere, I., Fleck, S., Nackaerts, K., Muysa, B., Coppin, P., Weiss, M., and Baret, F. 2004. Review of methods for in situ leaf area index determination Part I. Theories, sensors and hemispherical photography. Agricultural and Forest Meteorology 121: 19–35.

Morisette, J.T., Baret, F., Privette, J.L., Myneni, R.B., Nickeson, J.E., Garrigues, S., Shabanov, N.V., Weiss, M., Fernandes, R.A., Leblanc, S.G., Kalacska, M., Sánchez-Azofeifa, G.A., Chubey, M., Rivard, B., Stenberg, P., Rautiainen, M., Voipio, P., Manninen, T., Pilant, A.N., Lewis, T.E., Iiames, J.S., Colombo, R., Meroni, M., Busetto, L., Cohen, W.B., Turner, D.P., Warner, E.D., Petersen, G.W., Seufert, G., and Cook, R. 2006. Validation of Global Moderate-Resolution LAI Products: A Framework Proposed Within the CEOS Land Product Validation Subgroup. IEEE Transactions on Geoscience and Remote Sensing 44: 1804-1817.

Weiss M., Baret, F., Smith, G.J., Jonckheere, I., and Coppin, P. 2004. Review of methods for in situ leaf area index (LAI) determination. Part II. Estimation of LAI, errors and sampling. Agricultural and Forest Meteorology 121: 37–53.

Relevant Web links

We welcome links to sites relevant to leaf area index measurements.

TEMS T-sites

The Terrestrial Ecosystem Monitoring Sites (TEMS) database contains details on ecological variables and research sites which are undertaking ecological measurements.

LAI

Contributions

We would like to thank the following individuals for having provided inputs and comments to the LAI ECV.

. Josef Cihlar
.
Alan Belward, JRC
. Jean-Luc Widlowski, JRC

Contact

We welcome your inputs, comments and queries. Please send feedback to the GTOS Secretariat.

The above activities are part of Task Number CL-06-03 of the GEOSS implementation plan of GEO.

T1-River | T2-Water Use  | T3-Ground Water | T4-Lake | T5-Snow | T6-Galciers |
T7-Frost | T8-Albedo | T9-Land | T10-fAPAR | T11-LAI | T12-Biomass | T13-Fire |
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© FAO   ::   Global Terrestrial Observing System - GTOS   ::   11 November 2009