Effects of forest plantations on the genetic composition of conspecific native Aleppo pine populations

Afforestation is a common and widespread management practice throughout the world, yet its implications for the genetic diversity of native populations are still poorly understood. We examined the effect of Aleppo pine (Pinus halepensis) plantations on the genetic composition of nearby conspecific native populations. We focused on two native populations in Israel with different levels of isolation from the surrounding plantations and compared the genetic diversity of naturally established young trees within the native populations with that of local native adults, using nine nuclear microsatellite markers. We found that the genetic composition of the recruits was significantly different from that of local adults in both populations, with allelic frequency changes between generations that could not be ascribed to random drift, but rather to substantial gene flow from the surrounding planted Aleppo pine populations. The more isolated population experienced a lower gene flow level (22%) tha...

人工造林是全球范围内广泛应用的常规营林措施，但其对本土种群遗传多样性的潜在影响仍有待深入解析。本研究以阿勒颇松（Pinus halepensis）人工林为对象，探究其对邻近同种本土种群遗传组成的影响。我们选取以色列境内两个与周边人工林隔离程度存在差异的本土种群作为研究材料，采用9个核微卫星标记（nuclear microsatellite markers），对比了本土种群内天然更新幼树与当地本土成年个体的遗传多样性水平。研究结果显示，两个本土种群中天然更新幼树的遗传组成均与当地成年个体存在显著差异；世代间的等位基因频率变化无法用随机遗传漂变解释，而更可能源于周边阿勒颇松人工林的大规模基因流。隔离程度更高的种群其基因流水平更低（22%）