scholarly journals Quaternary climate change drives allo-peripatric speciation and refugial divergence in the Dysosma versipellis-pleiantha complex from different forest types in China

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yi-Han Wang ◽  
Hans Peter Comes ◽  
Ya-Nan Cao ◽  
Rui Guo ◽  
Yun-Rui Mao ◽  
...  
Keyword(s):  
Climate Change ◽  
Forest Types ◽  
Quaternary Climate ◽  
Dysosma Versipellis ◽  
Peripatric Speciation

Methane Hydrates in Quaternary Climate Change: The Clathrate Gun Hypothesis

10.1029/054sp ◽  
2003 ◽  
Author(s):  
James P. Kennett ◽  
Kevin G. Cannariato ◽  
Ingrid L. Hendy ◽  
Richard J. Behl
Keyword(s):  
Climate Change ◽  
Methane Hydrates ◽  
Quaternary Climate

Oxygen isotopes in terrestrial gastropod shells track Quaternary climate change in the American Southwest

2021 ◽  
pp. 1-11
Author(s):  
Jason A. Rech ◽  
Jeffrey S. Pigati ◽  
Kathleen B. Springer ◽  
Stephanie Bosch ◽  
Jeffrey C. Nekola ◽  
...  
Keyword(s):  
Climate Change ◽  
Oxygen Isotopic Composition ◽  
American Southwest ◽  
Quaternary Climate ◽  
San Pedro ◽  
Spatial Coverage ◽  
Oxygen Isotopic ◽  
The Last Glacial Maximum ◽  
The Last Glacial ◽  
Terrestrial Gastropod

Abstract Recent studies have shown the oxygen isotopic composition (δ18O) of modern terrestrial gastropod shells is determined largely by the δ18O of precipitation. This implies that fossil shells could be used to reconstruct the δ18O of paleo-precipitation as long as the isotopic system, including the hydrologic pathways of the local watershed and the gastropod systematics, is well understood. In this study, we measured the δ18O values of 456 individual gastropod shells collected from paleowetland deposits in the San Pedro Valley, Arizona that range in age from ca. 29.1 to 9.8 ka. Isotopic differences of up to 2‰ were identified among the four taxa analyzed (Succineidae, Pupilla hebes, Gastrocopta tappaniana, and Vallonia gracilicosta), with Succineidae shells yielding the highest values and V. gracilicosta shells exhibiting the lowest values. We used these data to construct a composite isotopic record that incorporates these taxonomic offsets, and found shell δ18O values increased by ~4‰ between the last glacial maximum and early Holocene, which is similar to the magnitude, direction, and rate of isotopic change recorded by speleothems in the region. These results suggest the terrestrial gastropods analyzed here may be used as a proxy for past climate in a manner that is complementary to speleothems, but potentially with much greater spatial coverage.

scholarly journals Late Quaternary climate change in the north-eastern highlands of Ethiopia: A high resolution 15,600 year diatom and pigment record from Lake Hayk

2018 ◽  
Vol 202 ◽  
pp. 166-181 ◽  
Author(s):  
Katie L. Loakes ◽  
David B. Ryves ◽  
Henry F. Lamb ◽  
Frank Schäbitz ◽  
Michael Dee ◽  
...  
Keyword(s):  
Climate Change ◽  
High Resolution ◽  
Late Quaternary ◽  
The North ◽  
Quaternary Climate ◽  
North Eastern ◽  
Eastern Highlands

scholarly journals Terrestrial Carbon Stock Potential in Selected Forest in Bhutan, India and Nepal

2021 ◽  
pp. 21-32
Author(s):  
Kezang Choden ◽  
Bhagat Suberi ◽  
Purna Chettri
Keyword(s):  
Climate Change ◽  
Forest Management ◽  
Carbon Stock ◽  
Sustainable Forest Management ◽  
Regional Scale ◽  
Stand Density ◽  
Forest Products ◽  
Forest Types ◽  
Sequestration Potential ◽  
The Government

Forests are natural carbon reservoirs that play an important role in the global carbon cycle for storing large quantities of carbon in vegetation and soils. Carbon stored in pool helps in mitigating climate change by carbon sequestration. The vulnerable countries to changing climate such as Bhutan, Nepal, and India require a full understanding of carbon dynamics as well as baseline data on carbon stock potential to mitigate anticipated risks and vulnerabilities (RVs) through climate change. The scope of such RVs are trans boundary in nature, however, the comparative studies at regional scale are still scanty. Therefore, the aim of this review is to assess the carbon stock potentials of selected forest types in the eastern Himalayan area, with an emphasis on Bhutan, India, and Nepal. This review paper is based on published articles, information from websites and considerable data from National forestry reports of India and Bhutan; emphasizing on aboveground biomass and soil organic carbon stock. The review showed that carbon stock potential is highly dependent on stand density, above-ground biomass, species richness and forest types. The sub-tropical forest was found to have larger carbon capacity and sequestration potential. SOC concentration and tree biomass stocks were significantly higher at the high altitude where there is less human disturbance. In general, forest coverage has increased compare to previous year in Bhutan, India and Nepal which ultimately leads to higher carbon stock potential. It is mainly due to strong policies and different strategies for conservation of forest management have reduced mass destruction despite a growing population. Despite the rules, deforestation continues to occur at various scales. However, it can be stated that the government and citizens are working hard to increase carbon stock potential, mostly through afforestation and community forest creation. In addition, it is recommended to practice sustainable forest management, regulated and planned cutting of trees and proper forest products utilization.

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