Towards quantifying changes in forest cover in the Araucaria forest-grassland mosaic in southern Brazil
Towards quantifying changes in forest cover in the Araucaria forest-grassland mosaic in southern Brazil
复制标题
量化巴西南部南洋杉森林-草原镶嵌区森林覆盖的变化
DOI：
10.1007/s00334-021-00841-2
复制
发表时间：
2021
影响因子：
2.5
通讯作者：
Giesecke
中科院分区：
文献类型：
--
作者：
Piraquive Bermúdez;Theuerkauf;Giesecke
既需要对过去植被覆盖的定量估计，以便更好地了解人与景观的相互作用，也需要在全球范围内评估植被覆盖变化对气候系统的影响。在北半球的温带地区已经开发了减少植被覆盖花粉表示偏差的模型，而在世界其他地区应用这些模型的经验有限。巴西南部的Araucariaforest草原马赛克是一个开阔和森林植物群落自然存在的地区，随着时间的推移，由于气候和人类活动的变化，它们的盖度发生了变化。因此，这一领域对这类研究特别感兴趣。现代花粉和植被的比较是在两个保护区进行的：巴拉那州的Vila Velha州立公园和南里奥格兰德州的Aparos da Serra国家公园。植被制图和分析主要集中在该植被类型的特征树种--狭叶南洋菜。在阿劳卡里亚草原--马赛克草原，开阔的植被和林地在数百米的尺度上发生变化。根据地表样本中的花粉比例，很难捕捉到这些变化。虽然禾本科花粉丰度不是反映当地开阔状况的良好指标，但几个花粉分类群可以作为当地植被覆盖度的指标。两个研究区的花粉植被比率(R值)比较好，表明禾本科和菊科大科植物个体的花粉产生在整个地区是相似的。狭叶南洋葱的植被覆盖度较低，而禾本科是该地区产粉量最高的植物之一。林地物种多样，而不是塔纳。小叶章被归为一个森林类群，由于两个研究区林地的物种组成不同，估计的这一类群的花粉生产力也不同。在未来的研究中，估计具有相同花粉传播综合征的树木群体的花粉生产力将是有益的。为保护区封闭式树冠设计的花粉传播模型的应用具有挑战性。需要进一步的模型开发来处理在半开放植被类型中不同水平释放的花粉。
Quantitative estimates of past vegetation cover are needed both regionally so human-landscape interactions can be better understood, and globally to evaluate the effects of changing vegetation cover on the climate system. Models reducing the bias in the pollen representation of vegetation cover have been developed in the temperate regions of the northern hemisphere, while experience applying them in other parts of the world is limited. TheAraucariaforest-grassland mosaic of southern Brazil is an area where open and forested plant communities exist naturally and have changed their cover over time due to changing climate and human activities. Therefore, this area is of particular interest for such studies. Modern pollen and vegetation comparisons were carried out in two protected areas: Vila Velha State Park in Paraná state and Aparados da Serra National Park in Rio Grande do Sul. Vegetation mapping and analysis focused onAraucaria angustifoliaas the characteristic tree of this vegetation type. In theAraucariaforest-grassland mosaic open vegetation and woodland change at a scale of hundreds of metres. These changes are difficult to capture based on pollen proportions in surface samples. While the abundance of Poaceae pollen is not a good indicator of locally open conditions, several pollen taxa can be used as indicators of the local vegetation cover. Pollen vegetation ratios (R-values) compare well between the two study regions, indicating that pollen production of individual species within the large plant families of Poaceae and Asteraceae are similar within the overall region.Araucaria angustifoliapollen is underrepresented with regards to its vegetation cover, while Poaceae are among the highest pollen producers in the region. Diverse woodland species other thanA. angustifoliawere grouped as one forest taxon and as the species composition of woodlands differed between the two study areas, so did the estimated pollen productivity of this group. It would be rewarding in future investigations to estimate pollen productivity for groups of trees with the same pollen dispersal syndrome. The application of pollen dispersal models designed for closed canopy in the protected areas was challenging. Further model development is required to deal with pollen released at different levels in semi-open vegetation types.
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影响因子：
3.9
作者：
M. Paez;F. Schäbitz;S. Stutz
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DOI：
10.1177/0959683618810394
发表时间：
2018
期刊：
The Holocene
影响因子：
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作者：
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影响因子：
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作者：
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DOI：
10.1177/0959683619846981
发表时间：
2019-05
期刊：
The Holocene
影响因子：
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作者：
Vincent Montade;M. Ledru;T. Giesecke;S. Flantua;H. Behling;O. Peyron
通讯作者：
Vincent Montade;M. Ledru;T. Giesecke;S. Flantua;H. Behling;O. Peyron