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首页> 外文期刊>Biological invasions >Why does land-use history facilitate non-native plant invasion? A field experiment with Celastrus orbiculatus in the southern Appalachians
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Why does land-use history facilitate non-native plant invasion? A field experiment with Celastrus orbiculatus in the southern Appalachians

机译：土地使用历史为什么会促进非本地植物的入侵？在南部的阿巴拉契亚山脉进行了野山芹的田间试验

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Although historic land use is often implicated in non-native plant invasion of forests, little is known about how land-use legacies might actually facilitate invasion. We conducted a 2-year field seeding experiment in western North Carolina, USA, to compare germination and first-year seedling survival of Celastrus orbiculatus Thunb. in stands that had been cultivated and abandoned a century earlier and were dominated by tulip poplar (Liriodendron tulipifera L.), and in paired stands that had never been cultivated and were dominated by oaks (Quercus spp.). Experiments were conducted at five sites with paired tulip poplar and oak stands by varying litter mass (none, low, or high) and litter type (tulip poplar or oak). We also performed reciprocal soil translocations using pots seeded with C. orbiculatus. Soil moisture and temperature were measured throughout the growing season. Germination and survival were highest in the tulip poplar stands. Germination was also higher in plots with low litter mass. Seedling survival was highest in plots with low litter mass or no litter. Soil moisture was higher in tulip poplar stands and under low-mass litter. Differences in germination and survival among the potted plants were minimal, suggesting that soil type and ambient site conditions were less important than litter conditions for C. orbiculatus establishment. Our results suggest that the low litter mass and mesic soil conditions that are characteristic of tulip poplar stands may confer higher invasibility and explain the higher abundance of C. orbiculatus in areas with successional overstory communities associated with historically cultivated forests.
机译：尽管历史土地的使用通常与非本地植物对森林的入侵有关，但人们对土地利用的遗产实际上如何促进入侵的了解很少。我们在美国北卡罗来纳州西部进行了为期2年的田间播种实验，比较了比目柏（Celastrus orbiculatus Thunb）的发芽率和第一年幼苗的存活率。在一个世纪以前就已经被种植和废弃的林分中，以郁金香杨树（Liriodendron tulipifera L.）为主，而从未配对过的成对林分，而以橡树为主导（Quercus spp。）。通过改变凋落物质量（无，低或高）和凋落物类型（郁金香杨树或橡木），在五个成对的郁金香杨树和橡树架上进行了实验。我们还使用用比杆梭菌播种的盆进行了互易的土壤移位。在整个生长季节测量土壤湿度和温度。郁金香杨树的发芽率和存活率最高。凋落质量低的地块的发芽率也更高。在垫料质量低或无垫料的地块中，幼苗的存活率最高。郁金香杨树林和低质量凋落物下的土壤水分较高。在盆栽植物中，发芽和存活的差异很小，这表明土壤类型和周围环境条件对建立比熊念珠菌的重要性不亚于凋落条件。我们的研究结果表明，郁金香杨树分具的低凋落物质量和中等土壤条件可能赋予较高的入侵性，并解释了在具有历史耕地森林的演替性过度群落的地区，双峰梭菌的丰度更高。

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