Forest thinning and shredded plant cover reduced soil-water stress during winter drought at three Arizona sites. Daily measurements showed that treatment effects varied with location and depth; severe drought weakened some mulch benefits. The peer-reviewed field study follows water held in the soil, providing local evidence about management during drought rather than a measured reduction in wildfire risk.
A daily sensor network followed soil-water conditions at three sites in Arizona, a state in the southwestern United States. Measurements ran from July 2024 to August 2025, spanning winter drought and its aftermath. Some soil measurements indicated drought stress lasting up to 293 days. The peer-reviewed field comparison examined forest thinning and mulch made from shredded vegetation.[1]
At the western site, untreated soil at a depth of 100 centimetres showed readings more negative than −2000 kilopascals over 260 days. Under mulch the duration was 118 days; the thinned area showed 170 days. Soil matric potential describes the tension associated with extracting water from soil: more negative readings indicate drier conditions and greater difficulty for plants.[1]
The network used 118 sensors in total. Shallow observations came from 25 or 30 centimetres, alongside the deeper measurements. Comparing points within treatment areas helped follow changing conditions through time rather than relying on a single soil reading.[1]
Mulch conserved moisture more clearly at the central site, while severe winter drought overwhelmed some benefits at the western site during particular periods. Vegetation, soils and climate differed among the locations, so comparisons centred on areas within each site. The measured outcome was soil water; wildfire risk and long-term tree survival were not directly assessed.[1]
