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1.
Agricultural intensification has led to the extreme simplification of agricultural landscapes. The subsequent impoverishment of farmland plant communities can drive dramatic changes in the associated food webs of agricultural systems, with potential implications for vertebrate pest management. Weeds may provide alternative food sources for damaging species and thus contribute to reducing their damage, which is particularly desirable if the species is a valuable resource in its own right. Wild rabbits (Oryctolagus cuniculus) are a game species of great conservation value in the Iberian Peninsula that cause frequent damage to crops. Here we describe the dynamics of non-crop plant communities over an annual cycle in a semiarid Mediterranean agro-ecosystem, and discuss the potential linkages and implications for rabbit damage management. Overall, the availability of alternative food for rabbits was very low, especially in the most extensive habitat types, i.e. olive groves and vineyards. The seasonal pattern in plant productivity, which coincides with the phenology of rabbits in Mediterranean areas was only detectable in the less intensively managed habitat types. Scarce natural vegetation remnants retained the highest richness, diversity and plant cover, potentially acting as a refuge for both, plants and rabbits. Our results indicate that intensive management practices, through reducing alternative food sources for rabbits, are likely to promote conflict between hunters, farmers and conservationists in semiarid agro-ecosystems of Southern Spain. 相似文献
2.
In previous studies the value of ecosystem services was evaluated microscopically by ecological indicators such as soil properties, biomass, carbon storage, oxygen release, water quality, and others. In this paper, the spatial heterogeneity of ecosystem services in Liuyang River basin was studied from the perspective of Geographic Information System (GIS) based spatial relationships by using a combination of geographic data and spatial analysis technologies. The Liuyang River basin was divided into grids with a resolution of 1km×1km. The weights of factors that affect the value of ecosystem services (such as topography, geological disasters, roads, scenic spots, vegetation coverage, and plant net primary productivity) were evaluated using the entropy method and analytic hierarchy process (AHP) in order to investigate the influence of natural and social factors on the value of ecosystem services in a quantitative manner. The results demonstrate that the value of ecosystem services is mainly affected by vegetation coverage, plant net primary productivity, and road network density. The value of ecosystem services grows with the increase in either vegetation coverage, plant net primary productivity, or road network density. Different types of land play different roles in ecosystem services. Cultivated land, grassland, and water each have significant supply and regulating functions while forest has significant regulating and supporting functions. The value of ecosystem services of cultivated land and water that are closely related to human activity is significantly influenced by spatial heterogeneity. In contrast, the effect of spatial heterogeneity on the value of ecosystem services of forest land and grassland that are located in mountains and hills, far away from the human accumulation zone, is insignificant. 相似文献
3.
H.K. F&#x;r&#x;nc&#x;olu S.S. Seefeldt B. ahin M. Vural 《Journal of Arid Environments》2009,73(12):1149-1157
In the semi-arid steppe rangelands of Central Turkey, Festuca valesiaca and Thymus sipyleus ssp rosulans have become the dominant species on degraded pastures. We hypothesized that decreases in species richness and abundance are correlated with increasing prevalence of these two species. Therefore, our objectives were to determine whether there are patterns in examined vegetation; how dominant species contribute to these patterns; and how patterns differ between grazed and ungrazed vegetation. We determined that protection from grazing increased species richness. Grazing significantly changed composition through decreasing total plant, forb, grass and F. valesiaca covers, while substantially increasing T. sipyleus cover. Topography, soil and grazing appear to impact the dominance of plant communities where F. valesiaca and T. sipyleus prevail. These two dominant species had a significant effect in shaping vegetation patterns. Based on regression analysis, alterations in species richness with changes in cover of forbs and shrubs were evident, and spatial heterogeneity of F. valesiaca and T. sipyleus indicated unstable vegetative patterns in heavily grazed pastures and successional changes in protected pastures. Our study results identify F. valesiaca and T. sipyleus as indicator species of vegetation suppression in condition assessments of degraded steppe rangelands. 相似文献
4.
To examine the influence of buffelgrass land conversion and pasture management on native species diversity and regeneration patterns, we describe community attributes and population structure in four different active pastures in thornscrub vegetation from eastern Sonora, Mexico. We compare a relatively undisturbed thornscrub community with a contiguous five years old active pasture, to identify species able to regenerate under current management practices. Buffelgrass conversion has a significant influence on species diversity and other community attributes. Active pastures have lower species diversity, crown cover and basal area of native species than the studied native thornscrub. An active pasture subjected to heavy grazing and without management of the thorny legume, Acacia cochliacantha, showed the lower species diversity and an almost monospecific stand of this legume. It is likely that the reduction in species diversity is caused by the conversion process, inadequate management and regeneration barriers that limit seedling establishment in active pastures. Our data recorded eight native species (13%) that were able to regenerate in active pastures. However, the great majority of native species were unable to regenerate under pastures. This study shows that under current management, active buffelgrass pastures maintain only a small fraction of native species with regenerating populations in the thornscrub. 相似文献
5.
沙坡头固沙植被若干土壤物理因子的空间异质性研究 总被引：26，自引：11，他引：15
采用地统计学的理论和方法,对沙坡头人工植被表层土壤(0~15 cm, 15~30 cm)物理因子的空间异质性进行了研究。传统统计学分析结果显示:土壤水分、容重平均值在0~15 cm层小于 15~30 cm层,毛管持水量、空隙度在0~15 cm层大于15~30 cm层,各因子变异系数在0~15 cm层均大于 15~30 cm层。变异函数分析结果表明:土壤水分、土壤容重、土壤毛管持水量和空隙度在0~15 cm层具有明显的空间异质性,表层土壤水分有效变程最大为28.2 m,土壤毛管持水量有效变程最小为13.8 m,各因子自相关部分的空间异质性变化范围在85.3%~99.9%之间,显著大于随机部分的空间异质性。15~30 cm层土壤容重、毛管持水量、空隙度为线性模型。在 Krig ing插值分析的基础上,绘制了土壤属性各因子的等值分布彩图,清楚直观地表达了各因子在空间上的分布。此外还分析讨论了土壤空间异质性和植被的关系。 相似文献
6.
E. Schlecht U. Dickhoefer E. Gumpertsberger A. Buerkert 《Journal of Arid Environments》2009,73(3):355-363
In view of the repeatedly reported overstocking of the high-altitude pastures on Al Jabal al Akhdar, northern Oman, plant species abundance, cover and frequency, and herbaceous mass yield were studied in ungrazed versus heavily grazed areas of this mountain range. In addition, plant species selection by goats along a gradient of 1000–2000 m and spatial extent of pasture areas were investigated after abundant rainfall and a subsequent 6-months dry spell by means of manual observation and GPS/GIS tools.The substantially higher species diversity and herbaceous mass yield in the ungrazed area illustrate the production potential of these mountain pastures or, respectively, the biodiversity and productivity loss resulting from continuous grazing. The concentration of goats' selection on only a dozen herbaceous and ligneous species favours pasture encroachment with poisonous shrubs such as Nerium mascatense in the lower and Dodonaea viscosa in the higher altitudes. Given the spatially limited extent of pasture areas, these are exposed to high stocking rates. Therefore, grazing and feeding schemes need to be developed which reduce livestock pressure on the pastures, taking into account local property rights, herding skills and the recovery potential of the vegetation, which heavily depends on unpredictable rainfall events. 相似文献
7.
This study was conducted in the arid Mediterranean Reserve located in northern Jordan, representing a continuous grazed arid rangeland ecosystem. Quantitative analyses on species diversity in addition to phytogeographical analysis were conducted. Some ecological parameters such as, life forms, growth forms, species density and frequency were investigated. A total of 93 vascular plant taxa belonging to 78 genera and 26 families were reported. This constitutes about 4.3% of the total flora of Jordan. Reported taxa include 13 species of grasses, 69 forbs and 10 shrubs and semi-shrubs. The botanical survey pointed to the presence of four rare species in Jordan. Plant species were classified into 28 functional groups. Pairwise correlation analyses among the most abundant species, showed that neutral associations dominated (75%) those communities, followed by positive associations (19%), while only (6%) showed negative association. Positive association may be attributed to direct facultative mutualism, or to physical environmental heterogeneity. Such a positive cooperation in the plant community can significantly maintain species diversity in adverse environments.The relationship between primary productivity and species richness showed a humpbacked pattern. Maximum richness corresponded to a biomass level of 300–400 g m−2. However, a sinusoidal curve-fitting model explained the relationship between graminoids biomass and species richness. These findings pointed to the adaptation of plant taxa to livestock grazing and to the small-scale spatial and environmental heterogeneity in arid Middle Eastern Mediterranean rangelands. Results suggest that optimal biodiversity conservation for the arid Middle Eastern grazing lands should consider their high level of spatial heterogeneity. Rangeland managers should adopt grazing plans that apply a range of grazing pressure across the area so as to maintain diversity at local and regional scales. 相似文献
8.
We review the current state of research on vegetation heterogeneity in the Monte Desert at scales varying from landscape to intra-patch. Different factors are related to vegetation heterogeneity at every scale. At a coarse scale (i.e. landscapes and communities) vegetation heterogeneity is commonly determined by abiotic factors, whereas biotic interactions usually influence fine scale (patch, intrapatch) heterogeneity. Communities are distributed at the landscape scale according to differences in precipitation, topography and soil attributes. On the other hand, there is evidence that the spatial pattern of plant patches within communities is determined by runon –runoff processes, although biotic influences such as grazing can induce changes in the spatial pattern of patches when plant cover is strongly reduced. In the same way, at patch and intrapatch scales, biotic interactions (i.e. plant –plant interactions, grazing) determine the size and the species composition of plant patches as well as the distribution of species inside plant patches. However, the mechanisms operating behind such biotic interactions at small scales are commonly related to plant-induced changes in the physical environment. We also found evidence of cross-scale interactions, feedbacks, and non-linear effects such as those induced by grazing disturbance. Our analysis showed some regional differences in patterns and processes related to vegetation heterogeneity along the Monte Desert which can be ascribed to climatic and taxonomic variation among areas. Although information about vegetation heterogeneity and its causes and consequences in the Monte Desert is abundant, some areas where knowledge is scarce are detailed. 相似文献
9.
微生境尺度上放牧退化草原群落特征与土壤有机质的空间分异性 总被引：1，自引：1，他引：0
格局和过程与异质性有关。以呼伦贝尔克氏针茅草原不同放牧强度下的演替群落为对象,开展群落植被空间分布格局及土壤有机质空间异质性研究。结果显示,不同放牧强度样地群落结构和群落种类组成存在明显差异。轻度放牧样地样方内有8种植物,群落优势种为克氏针茅（Stipa krylovii）;中度放牧样地样方内有12种植物,群落优势种为糙隐子草（Cleistogenes squyarrosa）;而重度放牧样地样方内只有7种植物,群落优势种为多根葱（Allium polyrhizum）。随放牧强度的增强,植被地上生物量及其变异系数逐渐降低;土壤有机质含量表现为轻度放牧>中度放牧>重度放牧,而其变异系数表现为中度放牧>轻度放牧>重度放牧。从植被地上生物量和土壤有机质含量变异函数分析来看,随放牧压力的增大,植被地上生物量空间自相关性增强,空间异质性变大;土壤有机质含量空间分布自相关性先增强,然后减弱,空间变异性先变大,然后变小。在10 cm×10 cm的微尺度上,重牧群落植被地上生物量和土壤有机质含量之间表现出明显的相关性（P<0.05）。 相似文献
10.
广西岩溶植被自然分布规律及对岩溶生态恢复重建的意义 总被引：29，自引：0，他引：29
广西的岩溶植被类型和物种多样性丰富，分为5个植被型组8个植被型共96个群系，广西岩溶植被纬度分布由南至北为季节性雨林→含热带成份的常绿落叶阔叶混交林→常绿落叶阔叶混交林，生态结构复杂，特有成分突出，形成特殊的热带亚热带岩溶植物区系。岩溶区生态建设与植被恢复过程中，需遵循植被地带性分布规律，参照区域性顶极植物群落，进行人工群落的重建设计，选择优良乡土树种尤其是速生常绿阔叶树种，模拟天然植被构建先锋植物群落，乔灌藤草优化配置，针对生境异质性的主导因子，强化岩溶山地造林与封育管理技术，有效提高生物生产效率和植被覆盖率，开发特有适生的名特优产品，带动经济发展、促进生态环境尽快改善。 相似文献
11.
景观空间异质性对地表水质服务的影响研究——以河南省伊河流域为例 总被引：1，自引：1，他引：0
人类干扰使景观空间异质性发生了剧烈变化,进而对生态系统服务产生了严重影响。目前,针对景观空间异质性与生态系统服务的关联关系研究还较为薄弱。以河南省伊河流域为研究区域,以地表水质服务为研究对象,分析了地表水质服务的空间变化;通过以水质采样点为中心建立缓冲区,分析了不同尺度下的景观空间异质性特征,并与地表水质指标进行相关性研究,以探讨景观空间异质性与地表水质服务间的影响规律及响应机制。结果表明：① 研究区地表水质状况整体上为西南、东北部较差,中部较好;② 从景观组成来看,林地面积占比或斑块个数的增加有利于地表水质的提高;③ 类型水平上,林地的景观构型与化学需氧量的质量浓度在200 m半径缓冲区内显著相关（P<0.05）,城镇用地的景观构型对地表水质的影响则在2000 m半径缓冲区内更为明显;④ 景观水平上,总磷的质量浓度受到景观构型变化的强烈影响（P<0.05）,景观构型异质性越低,总磷的质量浓度就越高;⑤ 适当增加景观空间异质性可有效降低地表水质污染物的质量浓度,提高地表水质服务。研究结论可为伊河流域的空间开发及水环境保护政策的制定提供科学依据。 相似文献
12.
C.L. Alados J. Puigdefábregas J. Martínez-Fernández 《Journal of Arid Environments》2011,75(12):1368-1376
The climate of semi-arid Mediterranean areas is characterized by highly variable rainfall and seasonal droughts, which favor highly specialized flora, high biodiversity, and the emergence of a large number of endemic species. Such highly specialized complex ecosystems are expected to be more difficult to return to a previous state following perturbation than are more mild ecosystems and lead to dramatic transitions in vegetation. An understanding of the circumstances under which irreversible transition shifts occur is vital in an age of climate change and socio-economic globalization. This will have significant consequences for those highly specialized areas unless management practices, conservation, and preventive measures are increased. Within ecosystems, the interactions between multiple factors acting at multiple temporal and spatial scales, and the inertia of ecological processes, make the consequences of current management practices persist for a long time. To understand the relative importance of the underlying mechanisms that influence the resilience of drylands in southeastern Spain, we reviewed what is known about plant–soil interactions and the spatial distribution of vegetation to detect early warning signs of desertification. We analyzed the role of the self-organizing capacity of vegetation in the formation of vegetation spatial patterns at multiple spatial scales. In addition, we evaluated the importance of threshold indicators as early detectors of transition shifts in dryland ecosystems. 相似文献
13.
Wild mammalian herbivores and cattle are fundamental drivers of African savanna ecosystems and have strong impacts on woody vegetation. However, few experimental studies have investigated the separate and combined influences of different large herbivores on spatial vegetation patterning. In East Africa, temporary cattle corrals (bomas) develop after abandonment into productive, treeless ‘glades’ that attract both domestic and wild herbivores. Edges of glades exhibit unusually high densities of large trees. We used a long-term, broad-scale manipulative experiment to test whether megaherbivores (elephants and giraffes), wild meso-herbivores (15–1000 kg), or cattle caused shifts in woody plant abundances in glade edges. We also examined cascading effects of megaherbivore and cattle exclusion on symbiotic Acacia ants and wild meso-herbivores in glade edges. Megaherbivore exclusion resulted in increased densities of tall trees, reproductive trees, and non-aggressive Acacia ant species in glade edges. Cattle presence reduced meso-herbivore use inside and away from glades, but not in glade edges. Our results suggest that megaherbivores and cattle can dampen the magnitude of spatial patterns associated with glades and glade edges. These findings provide insight into the development and maintenance of spatial heterogeneity in savannas, and emphasize that land use change and mammalian extinctions have complex, cascading ecological consequences. 相似文献
14.
横断山区产水服务空间异质性及归因分析 总被引：3，自引：1，他引：2
包括产水服务在内的生态系统服务已被纳入区域土地利用规划以及可持续发展决策中,识别其空间分异特征及影响因素是进行决策的基础,而空间分异的定量归因研究仍需进一步加强。以空间异质性明显的中国横断山区为研究区,借助InVEST模型模拟产水服务空间分布,选择气候、地形、土壤、植被、土地利用等因子,采用地理探测器开展产水服务空间异质性归因分析。结果表明,① 气候类因子是产水服务空间异质性的主要控制因子,其中以降水量和蒸散量为主。② 在不同地貌及气候分区中,各因子对产水的空间分异的解释能力存在显著差异：平缓地区,蒸散量解释能力远高于降水量,随着起伏度的增大,降水量解释能力逐步增强,最终成为主要因子;在高原气候区,以蒸散量解释能力最强,而在中亚热带气候区,降水量为主要的控制因子。③ 值得注意的是,平缓地区土地利用类型因子的解释能力较为突出,在山区发展中应注意土地利用的合理规划,以减轻土地利用变化对产水服务空间变化的影响。④ 风险探测识别的产水服务重要区主要为初育土及人为土分布区、灌木林区以及坡度在≤ 5°和25°~35°区域,而其对应的高程值则在不同区域之间存在差异,因此,在横断山区产水服务的维持与保护工作中应充分考虑不同分区的具体情况。 相似文献
15.
Jorge García-Girón Camino Fernández-Aláez Alejandro Nistal-García Margarita Fernández-Aláez 《Journal of Paleolimnology》2018,60(4):495-509
Macrofossils are known as a useful tool in reconstructing their original plant communities. However, most studies have been focused on comparing the composition and distribution of living plant communities and their remains in temperate lakes. Mediterranean shallow lakes have been historically far less studied and little is known about the relationships between Mediterranean macrophyte communities and their remains. The aim of our study is to assess how contemporary aquatic macrophyte communities are represented by their sedimentary remains in terms of composition, distribution and concordance between the contemporary and the subfossil assemblages in a procrustean superimposition space, and to determine which surface sediment cores, collected along a depth gradient, may represent best the whole-lake macrofossil assemblage. These analyses were carried out for both species and macrophyte growth forms (submerged hydrophytes, floating-leaved hydrophytes, helophytes and charophytes) in order to check which of the two (species and growth forms) were represented best by their macro-remains. The most abundant present-day species (Myriophyllum alterniflorum DC. and Potamogeton trichoides L.) were under-represented while Characeae and some floating-leaved hydrophytes (Polygonum amphibium L. and Ranunculus peltatus Schrank) were over-represented in sedimentary samples. Additionally, macro-remains of submerged hydrophytes and helophytes were generally found in the central areas and in close proximity to contemporary vegetation, whereas floating-leaved hydrophytes distributed close to the near-shore. Notwithstanding some disparities between contemporary vegetation and their macrofossil assemblages, we found a good agreement between present-day and sedimentary datasets for both species and macrophyte growth forms. Furthermore, our study suggests that sediment cores from deep areas are more likely to represent best the whole-lake macrofossil assemblage because of their high diversity, equitability and heterogeneity. We conclude that aquatic macrophyte subfossils from the central areas of the basin can be a very useful tool in tracking the species composition and structure of the original macrophyte communities in shallow Mediterranean lakes. Additionally, when considering the use of macro-remains to reconstruct the composition and structure of macrophyte growth forms, we recommend a multicore approach that uses transects running from the shore to the lake center. 相似文献
16.
In Mediterranean ecosystems, fire influences plant population dynamics and changes plant community structure by affecting germination and establishment of seeder shrubs. Fabiana imbricata is a long-lived seeder shrub with a broad distribution in South America. In Northwestern Patagonia grasslands there are many records of F. imbricata recruitment after fires. We hypothesized that recruitment is promoted by: 1) soil erosion that exposes deeply buried seeds; 2) direct fire effects such as heat that could break seed dormancy; 3) indirect fire effects (i.e. increase of light availability and elimination of allelopathic substances) and 4) water availability in spring. In field conditions, we tested the effects of shading and soil disturbance on F. imbricata recruitment and seed availability and distribution in the soil profile. Under controlled conditions, we investigated the influence of leaf leachate, light, heat and water on seed germination and seedling emergence. Seed germination was inhibited by leachate, and seedling emergence was inhibited by seed heated to 80 °C and 120° for 5 min. F. imbricata seedlings only emerged in germination treatments that simulated wet and very wet spring conditions. Fire and postfire wind that favor seed exposure, combined with high precipitation early in the growing season, would be necessary for successful shrub recruitment. When F. imbricata shrubland colonizes the grassland, it strongly modifies local vegetation structure, reduces species richness and increases fuel loads. F. imbricata is a key species in the ecosystem specially related to fire regime. Information on the postfire regeneration of this species would provide valuable knowledge of the changes in biomass accumulation in a fire-prone Mediterranean ecosystem. 相似文献
17.
There is growing recognition among ecologists that ecosystem engineers play important roles in creating habitat for other species, but the comparative and combined effects of co-existing engineers are not well known. Here, we evaluated the separate and interactive effects of two burrowing rodents, Gunnison's prairie dogs (Cynomys gunnisoni) and banner-tailed kangaroo rats (Dipodomys spectabilis), on lizards in the Chihuahuan Desert grassland (USA). We found that the mounds and burrow systems of both rodent species provided important habitat for lizards, with lizard abundance being 2 to 4-fold higher on mounds than in adjacent areas without mounds. Kangaroo rat mounds supported greater numbers of lizards than prairie dog mounds, but the prairie dog colony with kangaroo rats supported 2-times more lizards than the landscape with only kangaroo rats. A greater number of mound habitats were available for lizards where prairie dogs and kangaroo rats co-occurred, and the rodents created unique structural mound types with different spatial distributions on the landscape. Our results demonstrate the importance of burrowing rodents in creating habitat for other animals, and that the combined effect of ecosystem engineers, especially those with large ecological roles, can be complementary and additive in areas where they co-occur. 相似文献
18.
利用LI-6400便携式光合作用测量系统和LI-6400-09土壤呼吸室,对不同地形和不同植被条件下土壤呼吸速率及其影响因子进行测定。结果表明：科尔沁沙地土壤呼吸速率日变化均表现出上午逐渐增大,下午逐渐减小、凌晨最小的趋势。沙地土壤呼吸变化具有明显的空间异质性,土壤呼吸由大到小变化依次为：背风坡（1.95±0.21 μmolCO2·m-2·s-1）>坡顶（1.05±0.14 μmolCO2·m-2·s-1）>迎风坡（0.74±0.08 μmolCO2·m-2·s-1）>丘间低地（0.62±0.09 μmolCO2·m-2·s-1）。沙地土壤呼吸与植物生长条件具有密切关系,狗尾草（0.86±0.11 μmolCO2·m-2·s-1）>小叶锦鸡儿（0.69±0.06 μmolCO2·m-2·s-1）。土壤呼吸日变化速率与空气温度呈正相关,与空气相对湿度呈负相关关系,并且与土壤温度呈指数相关。沙丘内部不同地形、植被的[WTBX]Q10[WTBZ]差异不大。 相似文献
19.
Urbanization alters spatiotemporal patterns of ecosystem primary production: A case study of the Phoenix metropolitan region,USA 总被引：1，自引：0，他引：1
Previous studies have found that urbanization often decreases net primary production (NPP), an important integrative measure of ecosystem functioning. In arid environments, however, urbanization may boost productivity by introducing highly productive plant communities and weakening the coupling of plant growth to naturally occurring cycles of water and nutrients. We tested these ideas by comparing NPP estimated for natural and anthropogenic land covers in the Phoenix metropolitan region of USA using MODIS NDVI data and a simplified parametric NPP model. Most anthropogenic land covers exhibited higher production than the natural desert. Consequently, the combined urban and agricultural areas contributed more to the regional primary production than the natural desert did in normal and dry years, whereas this pattern was reversed in wet years. Primary production of this urban landscape was only weakly correlated with rainfall, but strongly with socio-economic variables. Our productivity estimates agreed well with NPP predicted by a process-based ecosystem model for the area. Significant uncertainties, however, remain due to extremely high heterogeneity of urban vegetation. Nevertheless, our results clearly show that urbanization may not only increase regional NPP and disrupt the coupling between vegetation and precipitation, but also increase spatial heterogeneity of NPP in this arid region. 相似文献
20.
Soil water repellency has direct implications to hydrological as well as geomorphological processes, especially in fire-prone ecosystems. Five predominant mechanisms have been described as generating water repellency in soils: fungal and microbial activity, growth of particular vegetation species, organic matter, heating of the soils by wildfires and soil characteristics. Herein we synthesize among these mechanisms and propose a general model describing the long-term properties of water repellency in soils. Using non-linear regression analysis methods we compare among different variants of the model in order to assess the relative role of vegetation on water-repellency dynamics. We suggest that following a wildfire event hydrophobic peak soil properties are dictated by vegetation properties, but that the rapid decrease is not associated with the vegetation. Following wildfires, the recovery of the ecosystem commences and water-repellency is characterized by increased predominance of the biotic activity. Thus, the general pattern of a rapid decrease and a long-term increase in water repellency can be described by a mathematical model presented herein. 相似文献