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On the cover: About 100,000 years ago, Diverse Homo species coexisted with our own species Homo sapiens. The Harbin cranium, or the Dragon Man, is one of the best preserved Middle Pleistocene human fossils. The cranium has a large cranial capacity falling in the range of modern humans, but is combined with a mosaic of primitive and derived characters. Phylogenetic analyses suggest that the diversification of the Homo genus had a much more distant past than previously presumed. The Harbin cranium and some other Middle Pleistocene human fossils from China represent the third human lineage that is the sister group of H. sapiens and has closer relationships with H. sapiens than Neanderthals with H. sapiens. Multiple Homo lineages in Africa, Asia and Europe probably had a strong capability for long-distance dispersal, but remained in relatively small and isolated populations. Diverse palaeoenvironments in Asia may have produced a varied biogeographic sink for human evolution.
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Position: Home > issue > November 28, 2021 Volume 2, Issue 4
Human-caused increases in reactive nitrogen burial in sediment of global lakes
Category:   Report   Download:  PDF  Figure
Author: Mei Wang,Benjamin Z. Houlton,Sitong Wang,Chenchen Ren,Hans J.M. van Grinsven,Deli Chen,Jianming Xu,Baojing Gu

a8.jpg

A conceptual model of nitrogen, carbon, and phosphorus burial in lakes.

Human activities have increased reactive nitrogen (Nr) input to terrestrial ecosystems compared with the pre-industrial era. However, the fate of such Nr input remains uncertain, leading to missing sink of the global nitrogen budget. By synthesizing records of Nr burial in sediments from 303 lakes worldwide, here we show that 9.6 í└ 1.1 Tg N year−1 (Tg = 1012 g) accumulated in inland water sediments from 2000 to 2010, accounting for 3%ĘC5% of global Nr input to the land from combined natural and anthropogenic pathways.





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