Postfire regeneration of<i>Pinus halepensis</i>Miller in a semi-arid area in Albacete province (southeastern Spain)

Herranz, José Marı́a; Martínez-Sánchez, J.J.; Marín, Angel; Ferrandis, Pablo

doi:10.1080/11956860.1997.11682381

Cited by 47 publications

(44 citation statements)

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“…However, the total crop of sound cones was considerably larger in un-thinned plots where the number of pines was much higher (see [9]). The observed post-fire recruitment of P. halepensis seedlings showed an extremely variable density, as reported in similar studies [24,27,47,48] but it was significantly higher in un-thinned plots and in stands with smoother slopes. Moreover, as observed in other studies, regeneration success of P. halepensis is often better on flat areas or with a moderate slope where seeds tend to accumulate and water retention capacity is higher [24,27,48].…”

Section: Discussionsupporting

confidence: 58%

Contrasting Effects of Fire Severity on the Regeneration of Pinus halepensis Mill. and Resprouter Species in Recently Thinned Thickets

García‐Jiménez

Palmero‐Iniesta

Espelta

2017

Forests

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Abstract:Many studies have outlined the benefits for growth and reproduction resulting from thinning extremely crowded young forests regenerating after stand replacing wildfires ("thickets"). However, scarce information is available on how thinning may influence fire severity and vegetation regeneration in case a new fire occurs. We investigated the relationship between thinning and fire severity in P. halepensis thickets, and the effects on the establishment of pine seedlings and resprouting vigour in resprouter species the year after the fire. Our results show a positive relationship between forest basal area and fire severity, and thus reserved pines in thinned stands suffered less fire damage than those in un-thinned sites (respectively, 2.02 ± 0.13 vs. 2.93 ± 0.15 in a scale from 0 to 4). Ultimately, differences in fire severity influenced post-fire regeneration. Resprouting vigour varied depending on the species and the size of individuals but it was consistently higher in thinned stands. Concerning P. halepensis, the proportion of cones surviving the fire decreased with fire severity. However, this could not compensate the much lower pine density in thinned stands and thus the overall seed crop was higher in un-thinned areas. Establishment of pine seedlings was negatively affected by the slope and positively driven by the number of cones and thus it was higher in un-thinned than in thinned stands (respectively, 2581 ± 649 vs. 898 ± 325 seedlings·ha −1 ). Thinning decreases fire intensity, and thus it may facilitate fire suppression tasks, but retaining a higher density of pines would be necessary to ensure P. halepensis regeneration after a new fire event.

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Section: Discussionsupporting

confidence: 58%

Contrasting Effects of Fire Severity on the Regeneration of Pinus halepensis Mill. and Resprouter Species in Recently Thinned Thickets

García‐Jiménez

Palmero‐Iniesta

Espelta

2017

Forests

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“…pinaster is a seeder. Similar to other Mediterranean Pinus species, such as Pinus halepensis Mill., P. pinaster reacts to fire by a rapid seed dispersal that starts at the beginning of fire and continues for a few months after the fire is extinguished (Herranz et al, 1997;Thanos et al, 1996). For P. pinaster, established temperature ranges cause post-fire germination seeds; specifically, as expressed by Herrero et al (2007), the temperature range between 70 and 110°C germinates P. pinaster seeds, regardless of exposure time.…”

Section: Study Areamentioning

confidence: 99%

Burn severity influence on post-fire vegetation cover resilience from Landsat MESMA fraction images time series in Mediterranean forest ecosystems

Fernández–Manso

Quintano

Roberts

2016

Remote Sensing of Environment

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Mediterranean ecosystems are adapted to recurrent forest fires by having regeneration mechanisms that overcome the immediate effects of fire. However, the increasing frequency of fires in most European Mediterranean countries is challenging the natural regrowth capability of these ecosystems. In this context, monitoring post-fire vegetation recovery is a priority for forest management and soil erosion control. In this work, a 13-year series (1999-2011) of Landsat 5 Thematic Mapper (TM)/Landsat 7 Enhanced Thematic Mapper (ETM +) data was used to model post-fire vegetation recovery as a function of burn severity and to quantify post-fire resilience as a measure of vegetation cover regrowth. We evaluated a large forest fire located in Spain that burned approximately 30 km 2 of Pinus pinaster Ait. in August 1998. 88 field plots of four burn severity levels (unburned, low, moderate and high) were measured in the field a year after the fire. As a variable representative of vegetation, we chose the shade normalized green vegetation fraction image (SGV) obtained by applying Multiple Endmember Spectral Mixture Analysis (MESMA) to the original Landsat TM/ETM + images. The SGV values were extracted for the 88 field plots and, after performing a one-way analysis of variance (ANOVA), a Fisher's Least Significant Difference (LSD) test allowed us to estimate resilience of vegetation cover as the number of post-fire years exhibiting a statistically significant difference between burned and unburned areas. Next, SGV values were referenced to unburned control plots values and the vegetation recovery index (VRI) was defined. The evolution in time curve of VRI for low, moderate and highly fire affected vegetation was fit using trend models (specifically, an exponential trend for VRI in high and moderate burn severity levels; a linear trend for low burn severity level, Root Mean Square Error, RMSE = 0.18, 0.13, and 0.09, respectively). We observed that vegetation cover affected by low severity fire recovered to its original state after 7 years, and vegetation cover affected by moderate severity recovered after 13 years. Vegetation affected by high severity fire was estimated to recover after 20 years. We conclude that VRI time series based on multitemporal MESMA fractions from Landsat data can be considered a valuable indicator of the post-fire vegetation cover recovery. Its temporal evolution represented post-fire vegetation cover regrowth adequately and facilitated the estimate of vegetation cover resilience in Mediterranean forests.

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“…P. pinaster is an obligate seeder that responds to fire through rapid seed dispersal, even beginning during a fire, and this continues for a few months after the disturbance; this is also a characteristic of other Mediterranean Pinus species, such as Pinus halepensis Mill. (Thanos et al 1996;Herranz et al 1997). For this reason, post-fire regeneration of this species depends on the canopy seed bank as a result of both the transient character of the soil seed bank for pine (Baskin and Baskin 1998) and the destruction of all seeds present on or near the soil surface during a fire.…”

Section: Introductionmentioning

confidence: 99%

Post-fire natural regeneration of a Pinus pinaster forest in NW Spain

et al. 2007

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The aim of this study was to analyse the regeneration of Pinus pinaster after wildfire and the possible inter and intraspecific competition during the first 3 years after fire. The study area is located in a P. pinaster stand in León province (NW Spain). Three study sites (S1, S2 and S3) were established in an area burned in 1998. In each site, three permanent plots (20 · 1 m) were marked. A total of 20 quadrats of 1 m 2 were studied in each plot. The number and height of pine seedlings 1, 2 and 3 years after fire was recorded in each quadrat. The regeneration of understorey vegetation in the quadrats was analysed concurrently. The significance of linear correlations among the number and height of seedlings and understorey vegetation cover was tested by calculating Pearson correlation coefficients.Seed germination and seedling emergence took place massively during the first year after the fire and decreased through time. The height growth was constant over the 3 years at site S2, while a growth burst could be observed between years 2 and 3 at sites S1 and S2. Also, pines from site S2 reached shorter maximum heights in all years compared to pines from site S1 and S3. The understorey vegetation showed minimal regeneration during the first year but then increased greatly with time. Woody understorey cover and total vegetation cover were negatively correlated with pine seedling density in sites with a high number of seedlings (e.g. S1 and S3). When woody cover, total cover and pine seedling density were low (e.g. S2), there were no correlations. There was a positive correlation between vegetation cover and the maximum height of Pinus seedlings in all study sites.

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Postfire regeneration ofPinus halepensisMiller in a semi-arid area in Albacete province (southeastern Spain)

Cited by 47 publications

References 1 publication

Contrasting Effects of Fire Severity on the Regeneration of Pinus halepensis Mill. and Resprouter Species in Recently Thinned Thickets

Contrasting Effects of Fire Severity on the Regeneration of Pinus halepensis Mill. and Resprouter Species in Recently Thinned Thickets

Burn severity influence on post-fire vegetation cover resilience from Landsat MESMA fraction images time series in Mediterranean forest ecosystems

Post-fire natural regeneration of a Pinus pinaster forest in NW Spain

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