Soil seed bank and growth rates of an invasive species, Piper aduncum, in the lowlands of Papua New Guinea
Soil seed bank and growth rates of an invasive species, Piper aduncum, in the lowlands of Papua New Guinea
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DOI：
10.1017/s0266467400001383
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发表时间：
2000-03
影响因子：
1.4
通讯作者：
H. M. Rogers;A. Hartemink
中科院分区：
文献类型：
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作者：
H. M. Rogers;A. Hartemink
巴布亚新几内亚低地部分地区的次生休闲植被主要是灌木Piper aduncum L.原产于南美洲在这里，我们报告的种子库，生长速度和生物量积累。沙打旺种子库占林下种子库的69%（408 m−2），占休闲地种子库的53%（1559 m−2）。在休闲地的树木种子库中，约90%的种子库以扁盾草为主，而在森林土壤中这一比例为78%。2年生的白背蕨已长到4.5 m高，每公顷地上生物量积累了48 Mg干物质（DM）。当76%的生物量由主干组成时，生物量积累率从第一年的10 Mg DM ha-1 y-1增加到第二年的40 Mg DM ha-1 y-1。134 kg DM ha−1 d−1的最高生长率出现在17月龄时。其种子库优势、生长快、生物量积累速率高是其侵略性入侵和单种性的主要原因。P. aduncum是本土树种的主要竞争对手，对巴布亚新几内亚丰富的生物多样性构成威胁。
Secondary fallow vegetation in parts of the Papua New Guinea lowlands is dominated by the shrub Piper aduncum L. that originates from South America. Here we report on its seed bank, growth rate and biomass accumulation. P. aduncum accounted for 69 % (408 m−2) of the seed bank in the forest and 53 % (1559 m−2) of the seed bank under fallow. About 90 % of the tree seed bank at the fallow site was dominated by P. aduncum whereas this was 78 % in the forest soil. Two-year-old P. aduncum had grown to 4.5 m height and had accumulated 48 Mg dry matter (DM) per ha of above ground biomass. The rate of biomass accumulation increased from 10 Mg DM ha−1 y−1 in the first year to 40 Mg DM ha−1 y−1 in the second year when 76 % of the biomass consisted of mainstems. The highest growth rate of 134 kg DM ha−1 d−1 occurred when P. aduncum was 17-mo-old. Aggressive invasion and monospecific stands of P. aduncum are explained by its dominance in the seed bank, fast growth, and high rates of biomass accumulation. P. aduncum is a major competitor to indigenous tree species and presents a threat to Papua New Guinea's rich biodiversity.