Plant and soil responses to fire on a fern-covered landslide in Puerto Rico
Plant and soil responses to fire on a fern-covered landslide in Puerto Rico
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DOI：
10.1017/s0266467400008981
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发表时间：
1995-08
影响因子：
1.4
通讯作者：
L. Walker;Wendy Boneta
中科院分区：
文献类型：
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作者：
L. Walker;Wendy Boneta
滑坡在热带山区很常见，发生在降雨量高、坡度大和土壤不稳定的地区（Garwood等人，1979年）。滑坡覆盖了波多黎各东部卢基略实验森林（LEF）约18公顷（0.1%）的陡坡（Guariguata 1990，Scatena & Larsen 1991），并且经常与道路有关（Guariguata & Larsen 1989，Scatena & Larsen 1991）。LEF的年降水量为3450 mm，季节变化很小（Brown等人，1983年）。在LEF的许多滑坡中，内蕨科的蕨类植物是主要植被，Guariguata（1990）认为这些蕨类植物可能在滑坡植被的发育中发挥作用。然而，很少有人知道蕨类植物在滑坡中的作用。蕨类植物形成密集的灌木丛中的左，偶尔被烧毁的道路工作人员，以保持能见度沿着路边。本研究探讨植物和土壤的反应，火灾对蕨类植物覆盖的滑坡在波多黎各，以确定其相对重要性，在维护蕨类植物丛。1990年4月，道路工作人员烧毁了LEF西部边缘650平方米滑坡（估计年龄：5-20岁）的一半。1990年4月10日（火灾发生后约3-5天），我们在中午在燃烧区和6个相邻的未燃烧区覆盖的两种蕨类植物（芒萁和Gleichenia bifida）的6个随机放置的位置进行了温度采样。《诺姆》沿用了Liogier和Martorell（1982）的观点。在每个位置，从三个水平中的每一个进行三次测量：5cm深度，
Landslides are common in tropical mountains and occur in areas of high rainfall, steep slopes and unstable soils (Garwood et al. 1979). Landslides cover approximately 18 ha (0.1%) of the steep slopes of the Luquillo Experimental Forest (LEF) in eastern Puerto Rico (Guariguata 1990, Scatena & Larsen 1991) and are frequently associated with roads (Guariguata & Larsen 1989, Scatena & Larsen 1991). The annual precipitation in the LEF is 3450 mm and there is little seasonal variation (Brown et al. 1983). Ferns in the family Gleicheniaceae are the dominant vegetation on many landslides in the LEF, and Guariguata (1990) has suggested that these ferns may have a role in the development of vegetation on landslides. However, very little is known about the role of ferns in succession on landslides. Ferns form dense thickets in the LEF that are occasionally burned by road crews to maintain visibility along roadsides. This study examines plant and soil responses to a fire on a fern-covered landslide in Puerto Rico to determine their relative importance in maintaining the fern thicket. In April 1990, road crews burned one-half of a 650 m2 landslide (estimated age: 5-20 yr) on the western edge of the LEF. On 10 April 1990 (approximately 3-5 days after the fire), we sampled temperatures at noon at six randomly placed locations in the burned area and six adjacent unburned areas covered with two species of ferns in the Gleicheniaceae (Dicranopteris pectinata and Gleichenia bifida). Nomenclature follows Liogier and Martorell (1982). At each location, three measurements were taken from each of three levels: 5 cm depth, the