Key Laboratory of Environmental Change and Ecological Development of Hebei Province

Shijiazhuang, China

Key Laboratory of Environmental Change and Ecological Development of Hebei Province

Shijiazhuang, China
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Yuecong L.,Hebei Normal University | Yuecong L.,Key Laboratory of Environmental Change and Ecological Development of Hebei Province | Yawen G.,Hebei Normal University | Yawen G.,Key Laboratory of Environmental Change and Ecological Development of Hebei Province | And 13 more authors.
Review of Palaeobotany and Palynology | Year: 2017

Modeling efforts to quantitatively reconstruct vegetation from pollen have never been attempted along the forest–steppe border of China, however such studies are important in interpreting fossil pollen assemblages of vegetation change along this ecotone. In this paper, relative pollen productivity (RPP) and relevant source area of pollen (RSAP) as two important parameters in quantitative vegetation reconstruction using the LRA (Landscape Reconstruction Algorithm approach) model, are estimated from the forest–steppe ecotone north of Shanxi, China, where pollen sampling and vegetation survey were performed at 18 random sample sites. The pollen analysis results show that Artemisia, Asteraceae, Poaceae, Pinus, Picea, Quercus, Betula and Hippophae dominate the pollen assemblages with more than 80% proportion. ERV (Extended R-value) analysis showed that the RSAP is about 600 m and that around 50% of the pollen in each sample comes from beyond this distance. RPPPoaceae (pollen productivity relative to Poaceae) is estimated as more than 10 for Pinus and Hippophae and around 5 for Picea and Betula. Estimates for Artemisia (3–4) are substantially lower than those reported from other studies in the steppe biome, and for Quercus (0.5) are substantially lower than those from the forest biome in north-east China or Europe. Four additional samples were then used to test the effectiveness of two different methods for reconstruction of vegetation proportion from pollen assemblages, the Landscape Reconstruction Algorithm (LRA) and the Modern Analogue Technique (MAT) showed that both methods can give generally reasonable results with similarity index more than 0.6, but there is still some discrepancy between the two methods. © 2017 Elsevier B.V.


Pang R.,Hebei Normal University | Pang R.,Key Laboratory of Environmental Change and Ecological Development of Hebei Province | Xu Q.,Hebei Normal University | Xu Q.,Key Laboratory of Environmental Change and Ecological Development of Hebei Province | And 5 more authors.
Acta Geographica Sinica | Year: 2010

The study on 82 surface soil pollen samples from different types of cultivated vegetations in central and southern parts of Hebei Province indicates that the pollen assemblages from farmlands on the plain have not only their own plant types, but also the pollen components from the nearby mountains. Arboreal pollen percentages and concentrations (dominated by Pinus) of samples from the farmlands in the mountains are higher than those on the plains, and it reduces gradually with the increasing distance away from the mountains. Taking Pinus in Taihang Mountains for example, its content is 20%-30%, 10%-20%, 20%-30% and below 16% respectively for the samples from the area of 0-50, 50-100, 100-150 and more than 150 km away from the east of Taihang mountains. The increase of Pinus proportion in the central plains is probably related to the fohn effect. The spatial variation of AP from mountains to plains in Hebei Province may be similar to the historical change of forests clearance by human activities in early period. Shrubby pollen proportion is small both in mountains and in plains, but their major components are different. Elaeagnaceae, Corylus, Ostryopsis and Oleaceae are common in mountain farmlands, while there are relatively high contents of Rosaceae and Vitaceae in plains, Herb content in plains (about 60%) is 15% higher than that in mountains, among which the Cereals and Cruciferae pollen percentages are 5% and 2% higher respectively. Artemisia pollen percentage on the plains is lower than that in the mountains. Since the human activities are weaker in mountains compared with that on the plains, the general trend is that Chenopodiaceae pollen increases from mountains to plains gradually, reflecting the raising intensity of human activities. The fern spores of Selaginella sinensis in mountains are higher than that on the plains, which is about 7%. The fern spores of Selaginella sinensis are not prone to be spread by wind, indicating that those in the surface soil of the plains may be carried by currents from mountains during the deposition of the plains.


Li Y.,Hebei Normal University | Li Y.,Key Laboratory of Environmental Change and Ecological Development of Hebei Province | Ge Y.,Hebei Normal University | Ge Y.,Key Laboratory of Environmental Change and Ecological Development of Hebei Province | And 9 more authors.
Atmospheric Environment | Year: 2015

This paper presents the results of pollen trapping studies designed to quantify the pollen assemblages carried in the winds of the Loess Plateau in Luochuan and Hunyuan. The one-year-collection samples analysis results show that pollen assemblages can be more sensitive to the change of climate than the vegetation composition, because of the change of pollen production. The analysis results of pollen traps in different weather regimes indicate that the pollen influx coming from dust weather contribute more to the total pollen influx than that coming from non-dust weather. The wind speed is the most important influenced factor to pollen assemblages, then the mean temperature and the mean relative humidity, the wind direction also contributes some. Strong wind coming from dust direction can make the percent and influx of Artemisia and Chenopodiaceae increase obviously with averagely higher than over 2.7 times in dust weather than in non-dust samples. The influences of wind speed and wind direction are not serious to some arboreal pollen such as Rosaceae, Quercus, Betula, Pinus and Ostryopsis, which are mainly influenced by temperature or the relative humidity such as Salix, Hippophae, Carpinus, Brassicaceae, Cupressaceae, Fabaceae. © 2015 Elsevier Ltd.


Pang R.,Hebei Normal University | Pang R.,Key Laboratory of Environmental Change and Ecological Development of Hebei Province | Xu Q.,Hebei Normal University | Xu Q.,Key Laboratory of Environmental Change and Ecological Development of Hebei Province | And 4 more authors.
Journal of Geographical Sciences | Year: 2011

The study on 82 surface soil pollen samples from different types of cultivated vegetations in central and southern parts of Hebei Province indicates that the pollen assemblages from farmlands in the plain have not only their own plant types, but also the pollen components from the nearby mountains. Arboreal pollen percentages and concentrations (dominated by Pinus) from farmlands in mountain area are higher than those in the plain, and it reduces gradually with the increasing distance away from the mountains. Taking Pinus pollen in Taihang Mountains as an example, its content is 20%-30%, 10%-20%, 20%-30% and below 16% respectively for the samples from the area of 0-50, 50-100, 100-150 and more than 150 km away from the east Taihang Mountains. The increase of Pinus pollen proportion in the central plain is probably related to the fohn effect. The spatial variation of AP from mountains to the plain in Hebei Province may be similar to the forests clearance by human activities in the early historical period. Shrubby pollen proportion is small both in mountains and in the plain, but their major components are different. Elaeagnaceae, Corylus, Ostryopsis and Oleaceae are common in mountain areas, while there are relatively high contents of Rosaceae and Vitaceae in the plain. Herbs content in the plain (about 60%) is 15% higher than that in mountains, among which the Cereals and Cruciferae pollen percentages are 5% and 2% higher respectively. Artemisia pollen percentage in the plain is lower than that in mountains. Since the human activities are weaker in mountains compared with that in the plain, the general trend is that Chenopodiaceae pollen increases from mountains to the plain gradually, reflecting the raising intensity of human activities. The fern spores of Selaginella sinensis in mountains are higher than that in the plain, but it still reaches to about 7% in the plain. The fern spores of Selaginella sinensis are not prone to be spread by wind, indicating that those in the surface soil of the plain may be carried by river water from mountains during the deposition of the plain. © 2011 Science in China Press and Springer-Verlag Berlin Heidelberg.

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