GRAM (Grup de Recerca Ambiental Mediterrània), Department of Geography, University of Barcelona, Montalegre, 6, 08001, Barcelona.
Environmental Management Centre, Mykolas Romeris University, Vilnius, Lithuania.
Sci Total Environ. 2018 Aug 15;633:285-292. doi: 10.1016/j.scitotenv.2018.03.195. Epub 2018 Mar 22.
Post-fire management practices after wildfires have an important impact on soil properties. Nevertheless, little research has been carried out. The aim of this study is to examine the impact of different post-wildfire forest management practices in a 10-month period immediately after a severe wildfire on soil properties. Two months after a wildfire, three experimental areas were designed, each one with different post-fire management: Cut and Remove (CR) where burned trunks were cut after fire and removed manually from the area; No Treatment (NT) where no intervention was carried out; and, Cut and Leave (CL) where burned trunks were cut and left randomly on topsoil. In each treatment, we collected nine samples (0-5cm deep). In total, we sampled 27 samples in each sampling date, two and ten months after the wildfire. The properties analyzed were aggregate stability (AS), total nitrogen (TN), soil organic matter (SOM), inorganic carbon (IC), C/N ratio, pH, electrical conductivity (EC), extractable calcium (Ca), magnesium (Mg), sodium (Na) and potassium (K). Soil C/N ratio was significantly higher in CR and CL treatments 10months after fire comparing to 2months after. On the other hand, pH, extractable Ca, Mg and K were significantly higher in all the treatments 2months after fire than 10months after. Aggregate stability, TN and SOM were significantly higher in CR comparing to CL, 10months after the fire. IC was significantly higher in CL than in NT treatment, also, 10months after the fire. Electrical conductivity was significantly higher in CR and CL treatments 2months after fire comparing to 10months after. According to the results, CR and CL post-fire management did not differ importantly from the NT scenario, showing that manual wood management does not have detrimental impacts on soil properties compared to mechanical operations.
火灾后管理措施对土壤性质有重要影响。然而，这方面的研究很少。本研究旨在考察严重林火后 10 个月内不同林火后管理措施对土壤性质的影响。林火发生两个月后，设计了三个试验区，每个试验区采用不同的林火后管理措施：伐除（CR），即在林火后将烧毁的树干砍断并人工从该区域移走；不干预（NT）；和，伐留（CL），即烧毁的树干被砍断并随机留在表土上。在每种处理中，我们收集了 9 个样本（0-5cm 深）。总共在每个采样日期采集了 27 个样本，即在林火后 2 个月和 10 个月。分析的性质包括团聚体稳定性（AS）、总氮（TN）、土壤有机质（SOM）、无机碳（IC）、C/N 比、pH 值、电导率（EC）、可提取钙（Ca）、镁（Mg）、钠（Na）和钾（K）。林火后 10 个月，CR 和 CL 处理的土壤 C/N 比显著高于林火后 2 个月。另一方面，所有处理在林火后 2 个月的 pH 值、可提取 Ca、Mg 和 K 均显著高于林火后 10 个月。林火后 10 个月，CR 处理的团聚体稳定性、TN 和 SOM 均显著高于 CL。IC 在 CL 中比 NT 处理更高，也是在林火后 10 个月。林火后 2 个月，CR 和 CL 处理的电导率明显高于林火后 10 个月。根据结果，与 NT 情景相比，CR 和 CL 火灾后管理在土壤性质方面没有明显差异，表明与机械作业相比，人工木材管理不会对土壤性质产生不利影响。
