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Peifang Leng
Department of Lake Research Helmholtz Centre for Environmental Research‐UFZ Magdeburg Germany

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Institute of Geographic Sciences and Natural Resources Research

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Research article
Published: 11 August 2021 in Journal of Geophysical Research: Biogeosciences
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Streams are regionally important sources of CH4 to the atmosphere, but the temporal variability in and control on CH4 concentrations and emissions are not well understood. Especially, lack of long-term data hampers our ability to predict CH4 emissions from streams. Here, we present a seven-year data set of biweekly CH4 concentration and underlying potential drivers from two adjacent small German streams with contrasting riparian area characteristics. Over the seven-year study period, mean CH4 concentration and emissionswere 0.20 and 0.07 μmol L–1 and 2.01 and 0.84 mmol m–2 d–1 for the two streams, respectively. Our findings suggest that the combination of seasonality and topography ultimately shaped the considerable temporal variations of CH4. CH4 oxidation and production in the streams were probably of minor importance. Instead, fluctuations in CH4 concentrations likely reflected temporal pattern of CH4 input from soils of the riparian zone with larger CH4 variations in the stream with more riparian lands. Structural equation modeling revealed DOC and nitrate as important predictors of CH4 concentration. However, we did not identify predictors of the considerable short-term variability, nor the explicit pathways of CH4 delivery to streams. The discrepancy of the CH4 flux between streams was likely triggered by different connectivity to riparian soils with higher CH4 emissions in the hydrologically more connected stream. Inter-annual comparison showed that changing hydrologic conditions, rather than warming, may impact future CH4 emissions from temperate streams. We predict higher CH4 emissions occur in wetter years in streams with close connectivity to riparian soils.

ACS Style

Peifang Leng; Norbert Kamjunke; Fadong Li; Matthias Koschorreck. Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity. Journal of Geophysical Research: Biogeosciences 2021, 126, 1 .

AMA Style

Peifang Leng, Norbert Kamjunke, Fadong Li, Matthias Koschorreck. Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity. Journal of Geophysical Research: Biogeosciences. 2021; 126 (8):1.

Chicago/Turabian Style

Peifang Leng; Norbert Kamjunke; Fadong Li; Matthias Koschorreck. 2021. "Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity." Journal of Geophysical Research: Biogeosciences 126, no. 8: 1.

Journal article
Published: 07 June 2021 in Sustainability
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Water is the key limiting factor in socioeconomic and ecological development, but it is adversely affected by climate change. The novel virtual water (VW) concept and water, energy, food, biodiversity, and human health (WEFBH) nexus approach are powerful tools to assess the sustainability of a region through the lens of climate change. Climate change-related challenges and water are complex and intertwined. This paper analyzed the significant WEFBH sectors using the multicriteria decision-making (MCDM) and analytic hierarchy process (AHP) model. The AHP model demonstrated quantitative relationships among WEFBH nexus sustainability indicators in the Greater Horn of Africa countries. Besides, the net VW imports and water footprints of major staple crops were assessed. The composite WEFBH nexus indices varied from 0.10 to 0.14. The water footprint of crops is increasing period by period. The results also revealed that most countries in the study area are facing WEFBH domains unsustainability due to weak planning or improper management strategies. The strong policy constancy among the WEFBH sector is vital for dissociating the high-water consumption from crop production, energy, environmental, and human health system. Thus, this study enhances insights into the interdependencies, interconnectedness, and interactions of sectors thereby strengthening the coordination, complementarities, and synergies among them. To attain sustainable development, we urgently call all public and private entities to value the amount of VW used in their daily activities and design better policies on the complex WEFBH nexus and future climate change.

ACS Style

Hubert Hirwa; Qiuying Zhang; Yunfeng Qiao; Yu Peng; Peifang Leng; Chao Tian; Sayidjakhon Khasanov; Fadong Li; Alphonse Kayiranga; Fabien Muhirwa; Auguste Itangishaka; Gabriel Habiyaremye; Jean Ngamije. Insights on Water and Climate Change in the Greater Horn of Africa: Connecting Virtual Water and Water-Energy-Food-Biodiversity-Health Nexus. Sustainability 2021, 13, 6483 .

AMA Style

Hubert Hirwa, Qiuying Zhang, Yunfeng Qiao, Yu Peng, Peifang Leng, Chao Tian, Sayidjakhon Khasanov, Fadong Li, Alphonse Kayiranga, Fabien Muhirwa, Auguste Itangishaka, Gabriel Habiyaremye, Jean Ngamije. Insights on Water and Climate Change in the Greater Horn of Africa: Connecting Virtual Water and Water-Energy-Food-Biodiversity-Health Nexus. Sustainability. 2021; 13 (11):6483.

Chicago/Turabian Style

Hubert Hirwa; Qiuying Zhang; Yunfeng Qiao; Yu Peng; Peifang Leng; Chao Tian; Sayidjakhon Khasanov; Fadong Li; Alphonse Kayiranga; Fabien Muhirwa; Auguste Itangishaka; Gabriel Habiyaremye; Jean Ngamije. 2021. "Insights on Water and Climate Change in the Greater Horn of Africa: Connecting Virtual Water and Water-Energy-Food-Biodiversity-Health Nexus." Sustainability 13, no. 11: 6483.

Journal article
Published: 20 December 2020 in Agronomy
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It is important to strengthen the studies on the response of soil respiration components to tillage practices and natural precipitation in cropland. Therefore, soil heterotrophic respiration (RH) and autotrophic (RA) respiration were monitored by a root exclusion method in the North China Plain (NCP). The tillage practices included no-tillage (NT) and conventional tillage (CT), and the study periods were the summer maize growth stages in 2018 and 2019. RH, RA, soil water content and temperature were measured continuously for 113 days by an automatic sampling and analysis system. The soil RH values on bright days and rain-affected days were higher under NT in 2018 (14.22 and 15.06 g CO2 m−2 d−1, respectively) than in 2019 (8.25 and 13.30 g CO2 m−2 d−1, respectively). However, the RA values on bright days and rain-affected days were lower under NT in 2018 (4.74 and 4.97 g CO2 m−2 d−1, respectively) than in 2019 (5.67 and 6.93 g CO2 m−2 d−1, respectively). Moreover, NT decreased RH but increased RA compared to CT in 2019. Compared to bright days, the largest increase in both RH and RA after rain pulses was under CT in 2019 (6.75 and 1.80 g CO2 m−2 d−1, respectively). Soil water content and soil temperature were higher in 2018 than in 2019. Moreover, NT increased soil water content and decreased soil temperature on bright days compared to CT in 2019. Furthermore, soil temperature accounted for more variations in RH on bright days and rain-affected days, but soil water content had a greater influence on RA on bright days. However, after precipitation, higher soil water content decreased RA under NT in 2018, while soil water content was positively related to RA under CT in 2019. This study determined the differential response of RH and RA to tillage practices and natural precipitation pulses, and we confirmed that excessively dry soil increases soil carbon loss after rain events in the NCP.

ACS Style

Kun Du; Fadong Li; Peifang Leng; Zhao Li; Chao Tian; Yunfeng Qiao; Zhaoxin Li. Differential Influence of No-Tillage and Precipitation Pulses on Soil Heterotrophic and Autotrophic Respiration of Summer Maize in the North China Plain. Agronomy 2020, 10, 2004 .

AMA Style

Kun Du, Fadong Li, Peifang Leng, Zhao Li, Chao Tian, Yunfeng Qiao, Zhaoxin Li. Differential Influence of No-Tillage and Precipitation Pulses on Soil Heterotrophic and Autotrophic Respiration of Summer Maize in the North China Plain. Agronomy. 2020; 10 (12):2004.

Chicago/Turabian Style

Kun Du; Fadong Li; Peifang Leng; Zhao Li; Chao Tian; Yunfeng Qiao; Zhaoxin Li. 2020. "Differential Influence of No-Tillage and Precipitation Pulses on Soil Heterotrophic and Autotrophic Respiration of Summer Maize in the North China Plain." Agronomy 10, no. 12: 2004.