Impacts of disturbance initiated by road construction in a subtropical cloud forest in the Luquillo Experimental Forest, Puerto Rico
Impacts of disturbance initiated by road construction in a subtropical cloud forest in the Luquillo Experimental Forest, Puerto Rico
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DOI：
10.1016/s0378-1127(98)00261-8
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发表时间：
1998-09
影响因子：
3.7
通讯作者：
L. Olander;F. Scatena;W. Silver
中科院分区：
文献类型：
--
作者：
L. Olander;F. Scatena;W. Silver
道路建设和外来植被的传播，这是常见的威胁高海拔热带森林的影响，在波多黎各的亚热带云雾林进行了评估。比较了6个月龄、35年龄公路填土和有、无草林下成熟林的植被、土壤和小气候。最近的道路填土有较高的光照水平，土壤温度，容重，较大的可交换的土壤养分和较高的土壤氧浓度池，但较低的土壤水分，土壤有机质和土壤总氮比成熟的森林。在35岁的道路填土，容重，土壤pH值和P池在统计上相似的成熟的森林，而土壤水分，全N和盐基阳离子是不同的。6个月龄的道路填料的地上总生物量约为2毫克/公顷，占主导地位的单子叶植物和草本植物的品种。35岁的道路填土区的生物量为10.5毫克/公顷，其中77%是非木本。幼苗密度、乔木密度和总木质生物量分别为成熟林的12%、28%和2%。在这些地区，土壤在施工过程中受到干扰，生物量的积累是已知的LEF最慢的。生物量达到成熟森林的水平可能需要200-300年。在施工期间未直接受到干扰的区域，道路对紧邻路面的5- 10 m区域以外的植被组成几乎没有影响。虽然非本地单子叶植物，其中之一已经种植沿着道路35年前，丰富的沿着干扰路边，他们一般缺席的成熟森林，只有丰富的人类起源的栖息地。
The impacts of road construction and the spread of exotic vegetation, which are common threats to upper elevation tropical forests, were evaluated in the subtropical cloud forests of Puerto Rico. The vegetation, soil and microclimate of 6-month-old roadfills, 35-year-old roadfills and mature forest with and without grass understories were compared. Recent roadfills had higher light levels, soil temperatures, bulk densities, larger pools of exchangeable soil nutrients and higher soil oxygen concentrations; but lower soil moisture, soil organic matter and total soil N than the mature forest. On the 35-year-old roadfills, bulk density, soil pH and P pools were statistically similar to the mature forest while soil moisture, total N and base cations were different. The total aboveground biomass of 6-month-old roadfills was about 2Mg/ha and dominated by a variety of monocot and herbaceous species. The 35-year-old roadfill areas had a biomass of 10.5Mg/ha, 77% of which was non-woody. Seedling density, tree density and total woody biomass were 12, 28 and 2% of mature forest sites, respectively. In these areas, where soils were disturbed during construction, accumulation of biomass is the slowest known for the LEF. It may take 200–300 years for biomass to attain mature forest levels. In areas that were not directly disturbed during construction, the road has had little effect on the vegetative composition beyond a 5–10m zone immediately adjacent to the pavement. Although non-native monocots, one of which had been planted along the road 35 years earlier, were copious along the disturbed roadside, they were generally absent from the mature forest and only abundant in habitats of anthropogenic origin.