Nitrous oxide emission from the littoral zones of the Miyun Reservoir near Beijing, China

Abstract

Large dams may be substantial contributors to greenhouse gas emissions. Nitrous oxide (N2O) is the third most important greenhouse gas but studies on N2O emission from reservoirs are limited. We measured N2O emissions and environmental factors including atmospheric pressure, wind speed, air and soil/sediment temperature, biomass, soil water content and organic matter, total nitrogen, NH4+-N and NO3−-N of soil, from the littoral zones of the Miyun Reservoir, near Beijing, China, in January, May, June, August, and October during 2009 and 2010. Using the static chamber method we investigated the seasonal and spatial variation, relating it to environmental factors. Spatial and temporal variations in N2O flux appeared to be influenced by several environmental factors, working singly or in conjunction, including soil water depth, soil nutrition, biomass, and wind speed. In winter and spring, high N2O emissions (up to 1.9 ± 0.6 mg N2O m−2 h−1) were recorded at both eulittoral and infralittoral zones, while the flux from the supralittoral zone was low during all the seasons (from −0.04 to 0.01 mg N2O m−2 h−1). This study suggests that the littoral zone is a substantial source of N2O. However, its spatiotemporal variation and environmental drivers are still not clear.

Carbon Dioxide Emissions from the Littoral Zone of a Chinese Reservoir

“…The study emphasizes how water level fluctuation may play an important role in influencing the emissions, e.g. increasing CH 4 emission through O 2 consumption by decomposing of plant tissue during flooding [18], increasing N 2 O emission by providing suitable moisture content during water recession [17,53], and decreasing CO 2 emission by regrowth of vegetation after water recession (this study). Table S1: Dominant plant species at each plot in different months; …”

CR1 retroposons provide a new insight into the phylogeny of Phasianidae species (Aves: Galliformes)

“…China boasts 56 species of Phasianidae in 21 genera and quite a number of these species are distributed in the southwestern mountains and southeastern Himalayas in China (Lei and Lu, 2006). Because of their largely restricted range, very small population size and severely fragmented habitat, several species and subspecies are classified as endangered.…”

Predicting suitable habitat of the Chinese monal (Lophophorus lhuysii) using ecological niche modeling in the Qionglai Mountains, China

“…This species is endemic to southwest China, and is found primarily in southeast Gansu, southeast Qinghai, western Sichuan, and northwest Yunnan (Lei & Lu, 2006; Lu, 2015). It has been listed on appendix I of CITES since 1975 (CITES, 2016) and classified as a vulnerable species on the IUCN red list since 1994 (IUCN, 2015).…”

“…As the geographical center of the distribution of the Chinese monal (Lei & Lu, 2006; Lu, 2015; Fig. 1), this region is critical for the conservation of the species.…”