@article{fdi:010096086,
  title = {{S}patial and temporal assessment of soil microbial respiration at microscale using proximal hyperspectral imaging},
  author = {{G}orretta, {N}. and {C}hevallier, {T}iphaine and {G}obrecht, {A}. and {B}eno{\^i}t, {M}. and {R}oger, {J}. {M}. and {B}arth{\`e}s, {B}ernard},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he study aimed to test the usefulness of the {H}yperspectral imaging ({HSI}) in the visible and near infrared ({VNIR}) to address temporal and spatial variations in surface soil microbial respiration during an incubation. {W}e hypothesized that {VNIR} {HSI} could show the heterogeneity and different evolutions of soil respiration between thermal stress and control conditions. {T}wo mesocosms (approximate to 1500 cm2) were incubated 28 days under controlled conditions. {P}rior to incubation, one mesocosm was heat-stressed (stress), while the other was not (control). {HS} images of mesocosms (pixel resolution 0.18 x 0.36 mm) were acquired at several incubation dates. {T}o calibrate respiration measurement of pixels, 56 standard samples were built and used as a calibration subterfuge to represent all conditions that would occur at the mesocosm surface in terms of straw cover, soil moisture, incubation date and consequences of initial thermal stress. {I}mages of standard samples were acquired at the same dates than mesocosm images, just after {CO}2 emitted by each standard sample (i.e. respiration) was measured. {P}artial least squares ({PLS}) regression was used to establish a cumulative respiration model based on the average spectra of each standard samples at each incubation date. {T}he calibration and validation yielded {R}2 = 0.88 and 0.85, respectively. {T}he prediction model of respiration was applied on each pixel of the mesocosms and yielded prediction maps. {T}he maps showed hotspots of respiration around plant residues surrounded by large areas of low respiration. {T}he approach did not only contrast pieces of straw versus the soil matrix, but also hotspots with different evolutions. {T}he effect of thermal stress on soil respiration patterns was not noticeable on mesocosms but was noted on standard samples with high straw cover. {F}urther development of {VNIR} {HSI} at proximal scale should be encouraged to investigate the spatio-temporal processes of biological activity after a disturbance.},
  keywords = {soil biological activity ; visible and near infrared reflectance ; spectroscopy ({VNIRS}) ; partial least squares regression ({PLSR}) ; thermal stress ; soil heterogeneity},
  booktitle = {},
  journal = {{J}ournal of near {I}nfrared {S}pectroscopy},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[15 p.]},
  ISSN = {0967-0335},
  year = {2026},
  DOI = {10.1177/09670335251408843},
  URL = {https://www.documentation.ird.fr/hor/fdi:010096086},
}