Rangeland Fractional Components Across the Western United States from 1985 to 2018

Autor:	Kory Postma, Patrick Danielson, Hua Shi, Adam Case, Matthew B. Rigge, George Xian, Collin G. Homer, Brian Granneman, Debra K. Meyer, Brett Bunde
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	0106 biological sciences 010504 meteorology & atmospheric sciences Science ved/biology.organism_classification_rank.species Land cover 010603 evolutionary biology 01 natural sciences Shrub rangeland remote sensing Ecoregion Grazing 0105 earth and related environmental sciences fractional components sagebrush time-series trends analysis climate impacts ved/biology Prescribed burn Vegetation Litter General Earth and Planetary Sciences Environmental science Physical geography Rangeland
Zdroj:	Remote Sensing; Volume 13; Issue 4; Pages: 813 Remote Sensing, Vol 13, Iss 813, p 813 (2021)
ISSN:	2072-4292
DOI:	10.3390/rs13040813
Popis:	Monitoring temporal dynamics of rangelands to detect and understand change in vegetation cover and composition provides a wealth of information to improve management and sustainability. Remote sensing allows the evaluation of both abrupt and gradual rangeland change at unprecedented spatial and temporal extents. Here, we describe the production of the National Land Cover Database (NLCD) Back in Time (BIT) dataset which quantified the percent cover of rangeland components (bare ground, herbaceous, annual herbaceous, litter, shrub, and sagebrush (Artemisia spp. Nutt.) across the western United States using Landsat imagery from 1985 to 2018. We evaluate the relationships of component trends with climate drivers at an ecoregion scale, describe the nature of landscape change, and demonstrate several case studies related to changes in grazing management, prescribed burns, and vegetation treatments. Our results showed the net cover of shrub, sagebrush, and litter significantly (p < 0.01) decreased, bare ground and herbaceous cover had no significant change, and annual herbaceous cover significantly (p < 0.05) increased. Change was ubiquitous, with a mean of 92% of pixels with some change and 38% of pixels with significant change (p < 0.10). However, most change was gradual, well over half of pixels have a range of less than 10%, and most change occurred outside of known disturbances. The BIT data facilitate a comprehensive assessment of rangeland condition, evaluation of past management actions, understanding of system variability, and opportunities for future planning.
Databáze:	OpenAIRE
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