Efficient Estimation of Biomass from Residual Agroforestry

ISPRS International Journal of Geo-Information

Sofia Bajocco¹  Giulio Sperandio²  Marco Bascietto² 

[1] Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria (CREA)-Centro di ricerca Agricoltura e Ambiente, CREA-AA, Via della Navicella 4, 00184 Roma, Italy;Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria (CREA)-Centro di ricerca Ingegneria e Trasformazioni agroalimentari, CREA-IT, via della Pascolare 16, 00015 Monterotondo, Italy;

关键词: ranked set sampling;    gis;    remote sensing;    ndvi;    residual biomass;    photo-interpretation;    corine land cover;   

DOI  :  10.3390/ijgi9010021

来源: DOAJ

【 摘 要 】

Cost-effective sampling methods for the estimation of variables of interest that are time-consuming are a major concern. Ranked set sampling (RSS) is a sampling method that assumes that a set of sampling units drawn from the population can be ranked by other means without the actual measurement of the variable of interest. We used data on vegetation dynamics from satellite remote sensing as a means in which to rapidly rank sampling units across various land covers and to estimate their residual agroforestry biomass contribution for a small cogeneration facility located in the center of a study area in central Italy. A remote sensing map used as an auxiliary variable in RSS enabled us to cut down the photo-interpretation of the residual biomass present in sampling units from 745 to 139, increase the relative precision of the estimate over common simple random sampling, and avoid individual subjective bias being introduced. The photo-interpretation of the sampling units resulted in a 1.12 Mg ha⁻¹ year⁻¹ mean annual density of residual biomass supply, although unevenly distributed among land cover classes; this led to an estimate of a yearly supply of 132 Gg over the whole 2276 km² wide study area. Further applications of this study might include the spatial quantification of biomass supply-related ecosystem services.

【 授权许可】

Unknown