ABSTRACT

In this study, mineral soil (0–10 cm depth) chemistry [pH, calcium (Ca), carbon (C), magnesium (Mg), nitrogen (N), phosphorus (P), potassium (K)] was measured pre – and post-fire (6 and 14 months post-fire) at two prescribed fire locations near Blacksburg, Virginia, USA. A similar, adjacent, unburned (control) forest was sampled during this time period, as well. Combinations of treatment and time did not indicate significant differences between the control and burned locations for any of the soil chemical variables when burned and control plots were evaluated within each, individual, sampling period (pre-fire, 6 months post-fire, and 14 months post-fire). Differences did exist, however, for some variables when compared across all treatment and time combinations. Differences were also noted for Ca, K, Mg, P, C, and N within the burned plots alone as a result of sampling time. These results agreed with those from other studies in this region that suggest 1) soil chemistry is highly variable, with and without prescribed fire, and 2) short-term changes in soil chemistry following singular, dormant season, prescribed fires are often negligible, particularly when compared to adjacent, unburned, control units. Increased fire intensity, severity, or fire frequency may enhance both short- and long-term post-fire soil responses.

摘要

在这项研究中，矿质土壤（0-10 厘米深度）化学 [pH、钙 (Ca)、碳 (C)、镁 (Mg)、氮 (N)、磷 (P)、钾 (K)] – 以及在美国弗吉尼亚州布莱克斯堡附近的两个指定火灾地点的火灾后（火灾后 6 个月和 14 个月）。在此期间，还对类似的、相邻的、未烧毁的（对照）森林进行了采样。处理和时间的组合在每个、个体、采样期（火灾前、火灾后 6 个月和 14火灾后数月）。然而，当在所有治疗和时间组合中进行比较时，某些变量确实存在差异。还注意到 Ca、K、Mg、P、C、和 N 单独作为采样时间的结果。这些结果与该地区其他研究的结果一致，这些结果表明 1) 土壤化学变化很大，有和没有规定的火灾，和 2) 在单一的休眠季节之后土壤化学的短期变化，规定的火灾通常可以忽略不计，特别是与相邻的未燃烧控制单元相比。火灾强度、严重程度或火灾频率的增加可能会增强火灾后土壤的短期和长期反应。未燃烧，控制单元。火灾强度、严重程度或火灾频率的增加可能会增强火灾后土壤的短期和长期反应。未燃烧，控制单元。火灾强度、严重程度或火灾频率的增加可能会增强火灾后土壤的短期和长期反应。