Surface pollen assemblages of human-disturbed vegetation and their relationship with vegetation and climate in Northeast China
Surface pollen assemblages of human-disturbed vegetation and their relationship with vegetation and climate in Northeast China
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东北地区人为干扰植被表面花粉组合及其与植被和气候的关系
DOI：
10.1007/s11434-011-4853-9
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发表时间：
2012-02-01
影响因子：
--
通讯作者：
He ZhiGuo
中科院分区：
文献类型：
--
作者：
Li ManYue;Li YueCong;He ZhiGuo
对东北地区53个表土花粉样品进行了花粉组合分析。乔木花粉含量通常高于30%，以松属（26.9%）、栎属（0.9%）、桦属（0.9%）和杨属（0.7%）为主;草本花粉含量通常高于50%，以禾本科（8.7%）、藜科（7.1%）、蒿属（1.9%）和菊科（3.5%）为主。因此，花粉组合与区域植被组成是一致的。但不同地区，特别是不同地貌单元的花粉组合存在差异。例如，在山区，有更多的树木花粉类型和较高的总百分比（平均42%）比其他地区，而谷物花粉百分比最低（11.2%）。在丘陵和高平原地区，草本花粉占花粉总量的60%以上，谷类花粉占优势，平均占53.6%。在低平原，花粉类型与丘陵和高平原相似，但总花粉浓度和同心囊的比例要高得多，而谷物花粉百分比略低（平均41.6%）。不同土地利用类型的花粉组合也存在差异。农田中禾谷类花粉含量大于40%，藜科花粉含量通常小于2.5%，而荒地中杂草禾本科花粉含量通常小于10%，藜科花粉含量通常大于25%。农田花粉总量（平均3909粒/g）明显低于荒地（平均15074粒/g）。相关分析表明，花粉组合与年平均气温呈显著负相关（-0.73）和7月平均气温（-0.81）与年平均降水量呈显著正相关（0.48），表明人工或人类的花粉组合-对北方不同地区的花粉组合进行了比较，结果表明，不同地区的花粉浓度反映了不同地区的气候特征，不同地区的花粉浓度反映了不同地区的气候特征在某种程度上，人类的影响。例如，花粉浓度随着人类影响强度的增加而减少。不同地区农田中花粉含量存在差异。东北地区的花粉含量明显高于北方大部分地区，反映了种植习惯和气候的差异。
Pollen assemblages of 53 surface pollen samples from farmlands and wastelands in Northeast China were analyzed. Tree pollen percentages were usually higher than 30%, with Pinus (26.9%), Quercus (0.9%), Betula (0.9%) and Populus (0.7%) as the major types, and herb pollen percentages were usually higher than 50%, with weedy Poaceae (8.7%), Chenopodiaceae (7.1%), Artemisia (1.9%) and Compositae (3.5%) as the major taxa. Thus, the pollen assemblages were consistent with the regional vegetation compositions. However, there were differences in pollen assemblages among regions, especially among different geomorphological units. For example, in the mountains, there were more types of tree pollen and higher total percentages (average 42%) than in other areas, while cereal pollen percentages were lowest (11.2%). In the hills and high plains, herbs made up more than 60% of the pollens, with cereals (average 53.6%) the dominant type. In the low plains, pollen types were similar to those in the hills and high plains, but total pollen concentrations and the proportion of Concentricystes were much higher, while cereal pollen percentages were slightly lower (average 41.6%). Pollen assemblages in different land use types also differed. For example, in farmland, cereal pollen percentages were more than 40% and Chenopodiaceae was usually less than 2.5%, while in wasteland, weedy Poaceae was usually less than 10% and Chenopodiaceae was usually higher than 25%. Total pollen concentrations in farmland (average 3909 grains/g) were much lower than in wasteland (average 15074 grains/g). Redundancy analysis revealed that pollen assemblages were significantly negatively correlated with mean annual temperature (-0.73) and July mean temperature (-0.81) and significantly positively correlated with mean annual precipitation (0.48), indicating that pollen assemblages in the artificial or human-disturbed vegetation reflect regional climate well.Comparison of pollen assemblages in different areas of northern China showed that pollen concentrations reflect the intensities of human impact to some degree. For example, pollen concentrations decrease as human impacts increase in intensity. The cereal pollen proportions in farmland differed by area. In Northeast China, cereal pollen proportions were distinctly higher than in most other areas of northern China, suggesting differences in planting habits and climate.