Journal
CATENA
Volume 226, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.catena.2023.107061
Keywords
Phytolith; Grassland; Paleoecology; Peat; Holocene
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By analyzing stratigraphic records from a peat profile in the Songnen region of Northeast China, it was found that this region has been occupied by grassland since the mid-Holocene. C3 grasses were always dominant, but C4 grasses have been increasing over time. The decrease in species richness and plant cover over the past 1,000 years was mainly influenced by climate changes, human activities, and local habitat factors.
Accurate estimates of changes in the composition and diversity of grassland ecosystems, and an understanding of the mechanisms responsible, are essential for predicting future changes and for conservation planning. Here, we synthesize stratigraphic records of phytoliths, together with previously published pollen, diatom, carbonate and grain-size records, from a peat profile (LDBS) in the Songnen region of Northeast China. The results demonstrate that since the mid-Holocene this region was occupied by grassland, with C3 grasses always dominant but with C4 grasses progressively increasing. The species richness and plant cover were high and relatively stable for most of the studied interval, but they decreased significantly in the last similar to 1,000 years. The long-term evolution of this grassland ecosystem was dominated by climate changes, but it was also affected by human activities and local habitat factors. The plant cover and several dominant plant taxa were climatically sensitive, while the C4 grasses also responded to changes in the water table and human activities. Species richness was relatively stable but it responded to long-term climatic changes. Phytolith-based reconstruction of Holocene plant community composition and diversity and their driving mechanisms can potentially be used to facilitate conservation planning in this temperate grassland ecosystem.
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