Effects of prescribed burning for pasture reclamation on soil chemical properties in subalpine shrublands of the Central Pyrenees (NE-Spain)

On two accumulation levels, separated by an unevenness up to 2 m, two contrasted plant communities can be differentiated in subalpine stage of the Pyrenees: the dense tussock-forming grass Nardus stricta, at the upper level (L1), and the open chalk grasslands at the lower level (L2). In order to confirm the soil-relief-grasslands relationships, we analyzed and compared soil pedogenesis and properties in both accumulation levels. In addition, we classify the soils following WRB and ST systems and we discuss the finesse of both taxonomies in these high mountain environments. The work has been carried out at 1900 masl, in the Ordesa and Monte Perdido National Park (PNOMP), in the summer grasslands site of La Estiva (Fanlo, Central Pyrenees, NE Spain). Five soil pits were studied in every accumulation level (L1 and L2) for a side-by-side comparison.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; The study of soils in the two levels of accumulation reveals a series of differences in their genesis, properties and soil classification. The accumulation of organic matter and lixiviation are the dominant edafogenetic processes in L1, to which we must add the rejuvenation by gully erosion in L2. Soils at L1 and L2 shared many physical properties as a fine granulometry, with a homogeneous particle-size distribution with depth. In both levels, the soils lack carbonates, even though limestones are the parental material. The soils in L1 have a greater thickness and, thus, a higher water holding capacity than in L2. In relation to chemical properties, soils in L1 have a significantly lower pH, a lower base saturation, and lower available calcium content than in L2, reflecting a more intense leaching process, consistent with a longer period of slope stability. Over L1 with Nardus mat-grasslands, the main soil is classified as Orthoeutric Cambisols (Clayic, Humic), and the soil over L2, with chalk-grasslands, as Hypereutric Leptosols (Loamic, Ochric). Soil taxonomy System (USDA), giving more weight to the temperature regime, classify both soils as Haplocryept, at the level of great group, separating them at the subgroup level as Typic Haplocryept (L1) and Lithic Haplocryept (L2), according to the depth at which limestone appears (lithic contact). Definitely, the microtopograhy and geomorphologic context, is linked to the pedodiversity, which goes hand in hand with plant diversity in this subalpine environment.

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Burning of alfalfa stubble for insect control as it affects soil chemical properties

Canadian Journal of Soil Science ◽

10.4141/cjss92-016 ◽

1992 ◽

Vol 72 (2) ◽

pp. 169-175 ◽

Cited By ~ 6

Author(s):

J. F. Dormaar ◽

B. D. Schaber

Keyword(s):

Pest Management ◽

Prescribed Burning ◽

Chemical Properties ◽

Management Programme ◽

Soil Chemical Properties ◽

Total N ◽

Southern Alberta ◽

Pest Insects ◽

Alfalfa Seed ◽

Subsequent Crop

Southern Alberta growers often burn fields of seed alfalfa (Medicago sp.) prior to initiation of growth in the spring as a part of an Integrated Pest Management Programme. An 8-yr study compared the effects of (a) fall-burned every year, (b) spring-burned, prior to growth, every year, (c) spring-burned, prior to growth, every other year, and (d) zero burned, on various chemical properties of the upper 50 mm of soil. Burning led to highly significant increases in carbohydrates, total N, NO3-N, and extractable K over the 8 yr. Increases were also highly significant for NH4-N under the fall-burned every year regime. Spring-burning, prior to growth, every other year, led to the least accumulations of measured parameters. Although pest insects were controlled and pedigreed alfalfa seed production was increased under the various burn treatments examined within the conditions of the experiment, changes in certain soil chemical properties identified the need to monitor subsequent crop behavior once the alfalfa fields have been ploughed. Key words: Fire, prescribed burning, pest management, seed alfalfa

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Efeitos da queima controlada sobre algumas propriedades químicas do solo em um povoamento de Pinus taeda no município de Sengés - PR

FLORESTA ◽

10.5380/rf.v27i12.2298 ◽

1997 ◽

Vol 27 (12) ◽

Cited By ~ 1

Author(s):

ANTONIO CARLOS BATISTA ◽

CARLOS BRUNO REISSMANN ◽

RONALDO VIANA SOARES

Keyword(s):

Pinus Taeda ◽

Loblolly Pine ◽

Soil Ph ◽

Prescribed Burning ◽

Chemical Properties ◽

Soil Chemical Properties ◽

Litter Layer ◽

Pine Plantation ◽

Fresh Litter

Este trabalho teve por objetivo avaliar o efeito de uma queima controlada sobre as propriedades químicas do solo de um povoamento de Pinus taeda. Para obtenção dos dados foram alocados aleatoriamente 5 pontos amostrais em uma área de 1000 m2. Em cada um destes pontos foram estabelecidas 4 amostras, 2 a serem queimadas e 2 sem queimar. Após a queima foram abertos micro-perfis em cada amostra, coletando-se material da serapilheira recém-caida (L) e semi-decomposta (F) e de solo nas profundidades de 0 a 5 cm, 5 a 10 cm, 10 a 15 cm e 15 a 20 cm. Os resultados mostraram uma redução (não significativa) de N e K e um aumento (não significativo) de Ca e Mg na serapilheira das áreas queimadas. A análise do pH do solo mostrou não haver diferença significativa entre áreas queimadas e não queimadas. Houve um aumento também não significativo da concentração de Ca, Mg, K e P nas camadas superficiais do solo após a queima. Effects of prescribed burning on soil chemical properties in a loblolly pine plantation in Sengés - Pr, Brazil Abstract The objective of this research was to evaluate the effects of a prescribed burning on soil chemical properties in a loblolly pine plantation. Data were collected from 5 random sites, in a 1,000 m2 área. From each site 4 plots, two burned and two unburned, were demarcated. After the burn was made, profiles were open in each plot and samples of fresh litter, partially decomposed litter, and soil at 0 - 5 cm, 5 - 10 cm, 10 - 15 cm, and 15 - 20 cm dephts were collected. Results showed a statistically non significative reduction of N and K, and an also non significative increase of Ca and Mg in the litter layer of the burned plots. Analysis of soil pH presented no significative difference between burned and unburned plots. It was also observed a non significative increase on the levels of Ca, Mg, K and P in the soil superficial layers.

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