Departamento de Ciencias Agrarias y del Medio Natural, Escuela Politécnica Superior de Huesca, Instituto de Investigación en Ciencias Ambientales (IUCA), Universidad de Zaragoza, Ctra. Cuarte s/n, 22071 Huesca, Spain.
Departamento de Química Analítica, Escuela Politécnica Superior de Huesca, Universidad de Zaragoza, Ctra. Cuarte s/n, 22071 Huesca, Spain.
Sci Total Environ. 2018 Dec 10;644:583-593. doi: 10.1016/j.scitotenv.2018.06.363. Epub 2018 Jul 11.
The abandonment of the traditional pastoral activities in the subalpine grasslands of the Central Pyrenees (NE-Spain) has resulted in shrub encroachment processes that are dominated by species such as the Echinospartum horridum. Therefore, prescribed burning has been recently readopted in this region as a management tool to stop the spread of shrubs and recover grasslands. We aimed to assess the effect that this practice may have on soil chemical properties such as SOC, N, pH, EC, water-extractable and exchangeable cations (Ca, Mg and K), cation exchange capacity, inorganic N forms (N-NH and N-NO) and available P. We studied two prescribed burnings conducted at the subalpine level of the Central Pyrenees in the municipalities of Tella-Sin (April 2015) and Buisán (November 2015). At each site, the topsoil was sampled in triplicate at soil depths of 0-1, 1-2 and 2-3 cm immediately before (U), immediately after (B0) and one year after (B12) burning, and litter and/or ashes were removed prior to sampling. The results indicate that in the B0 samples, burning significantly reduced the SOC and N contents as well as the exchangeable Ca and Mg at 0-1 cm, whereas the rest of the studied properties remained virtually unchanged. However, in the B12 samples we detected a decrease of nutrient content that was probably related to leaching and/or erosion processes.
中央比利牛斯山脉（西班牙东北部）亚高山草地传统放牧活动的废弃导致了以棘豆属植物（Echinospartum horridum）为主的灌丛侵入过程。因此，最近该地区重新采用了计划火烧作为一种管理工具，以阻止灌木的蔓延和恢复草地。我们旨在评估这种做法可能对土壤化学性质（如 SOC、N、pH、EC、水可提取和可交换阳离子（Ca、Mg 和 K）、阳离子交换能力、无机 N 形态（N-NH 和 N-NO）和有效 P）产生的影响。我们研究了在中央比利牛斯山脉亚高山地区的泰拉-辛市（2015 年 4 月）和布伊桑市（2015 年 11 月）进行的两次计划火烧。在每个地点，在火烧前（U）、火烧后立即（B0）和火烧后一年（B12），在土壤深度为 0-1、1-2 和 2-3 cm 处，分别对表层土壤进行了三分样，并在采样前去除了凋落物和/或灰烬。结果表明，在 B0 样品中，火烧显著降低了 SOC 和 N 含量以及 0-1 cm 处的可交换 Ca 和 Mg，而其余研究性质几乎保持不变。然而，在 B12 样品中，我们检测到养分含量的下降，这可能与淋溶和/或侵蚀过程有关。
