JPE:中科院武汉植物园丁建清研究组揭示生物入侵的纬度格局研究
国际生态学期刊Journal of plant Ecology在线发表中国科学院武汉植物园丁建清研究员的关于生物入侵、纬度梯度以及二者交互效应对本土多样性的影响的研究论文。
伴随快速的全球变化，生物入侵态势日益加剧。全球物种丰富度沿纬度从赤道向两级逐渐下降，形成显著的纬度梯度多样性(LDG)，而外来种的入侵效应也可能沿纬度发生变化。但目前，关于生物入侵、纬度梯度以及二者交互效应对本土多样性的影响这一机制依然研究甚少。
武汉植物园博士研究生吴昊在研究员丁建清的指导下，通过设置8条纬度样带(59个样地)，对中国大陆21°N-37°N 大尺度范围内入侵植物空心莲子草群落进行了野外调查，探讨其入侵效应的纬度格局，结果显示：(1)入侵群落的α物种多样性整体表现出随纬度上升而下降的趋势;(2)空心莲子草的入侵态势在35°N之前随纬度上升而显著增大，但在35°N之后的高纬地区开始下降;(3)小规模空心莲子草入侵(入侵盖度<7%)可以提高本土植物多样性，但超过一定阈值则降低多样性;(4)典范对应分析(CCA)表明，随着纬度升高，入侵群落的伴生种逐渐由中生植物过渡到湿生植物。
研究结果暗示空心莲子草对本土物种多样性的削弱作用随纬度上升而被加剧，这对于预测气候变暖背景下空心莲子草入侵态势、深入理解生物入侵与环境因子关系具有重要参考意义。
空心莲子草群落α物种多样性沿纬度梯度变化箱式图
空心莲子草群落物种沿纬度梯度分布的CCA排序图
原文链接：
Invasion by alligator weed, AlteRNAnthera philoxeroides, is associated with decreased species diversity across the latitudinal grADIent in China
原文摘要：
Aims Invasive species occurrence and their effects on biodiversity may vary along latitudes. We examined the occurrence (species cover) and relative dominance (importance value) of invasive alligator weed,Alternanthera philoxeroides, in its terrestrial habitat in China through a large-scale latitudinal field investigation.Methods We established 59 plots along the latitudinal transect from 21°N to 37°N. We recorded species name, abundance, height and individual species coverage of plants in every quadrat. We then measured α-species diversity variations associated with the A. philoxeroides community across the latitudinal range. We also analyzed the effect of latitude on plant species’ distributions in this community by using canonical correspondence analysis (CCA).Important Findings We found that species cover and importance value ofA. philoxeroides increased in areas <35°N, but decreased at higher latitudes. Lower latitudes supported greater species diversity than higher latitudes. Small-scale invasion of A. philoxeroides was associated with higher species diversity, but community diversity was lower when A. philoxeroides species cover exceeded 36%. Community plant species changed from mesophyte to hygrophyte gradually from low to high latitude. Our research suggests that latitude had significant influences on community diversity which interacted with the biotic resistance of a community and impact of invasion. Consequently, A. philoxeroides may become more invasive and have greater negative impacts on community species diversity in higher latitudes as global climate changes.
doi: 10.1093/jpe/rtv060
作者：丁建清
