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Remotely-sensed slowing down in spatially patterned dryland ecosystems

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Title Remotely-sensed slowing down in spatially patterned dryland ecosystems
 
Creator Veldhuis, M.P.
Martinez-Garcia, R.
Deblauwe, V.
Dakos, V.
 
Subject vegetation
resilience
sudan
ecosystems
 
Description Open Access Journal; Published online: 23 Aug 2022
Regular vegetation patterns have been predicted to indicate a system slowing down and possibly desertification of drylands. However, these predictions have not yet been observed in dryland vegetation due to the inherent logistic difficulty to gather longer-term in situ data. Here, we evaluate the theoretical prediction that regular vegetation patterns are associated with empirically derived temporal indicators (autocorrelation, variance, responsiveness) of critical slowing down in a dryland ecosystem in Sudan using different remote sensing products.

We use recently developed methods using remote-sensing EVI time-series in combination with classified regular vegetation patterns along a rainfall gradient in Sudan to test the predicted slowing down. We tested our empirical findings against theoretical predictions from a stochastic version of a spatial explicit model that has been used to describe vegetation dynamics in drylands under aridity stress.

Overall, three temporal indicators (responsiveness, temporal autocorrelation, variance) show slowing down as vegetation patterns change from gaps to labyrinths to spots towards more arid conditions, confirming predictions. However, this transition exhibits non-linearities, specifically when patterns change configuration. Model simulations reveal that the transition between patterns temporarily slows down the system affecting the temporal indicators. These transient states when vegetation patterns reorganize thus affect the systems resilience indicators in a non-linear way.

Our findings suggest that spatial self-organization of dryland vegetation is associated with critical slowing down, but this transition towards reduced resilience happens in a non-linear way. Future work should aim to better understand transient dynamics in regular vegetation patterns in dryland ecosystems, because long transients make regular vegetation patterns of limited use for management in anticipating critical transitions.
 
Date 2022-10
2023-01-13T09:35:34Z
2023-01-13T09:35:34Z
 
Type Journal Article
 
Identifier Veldhuis, M.P., Martinez‐Garcia, R., Deblauwe, V. & Dakos, V. (2022). Remotely‐sensed slowing down in spatially patterned dryland ecosystems. Ecography, 2022(10): e06139, 1-10.
0906-7590
https://hdl.handle.net/10568/127035
https://dx.doi.org/10.1111/ecog.06139
NATURAL RESOURCE MANAGEMENT
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format 1-10
application/pdf
 
Source Ecography