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Zonal aspects of the influence of forest cover change on runoff in northern river basins of Central Siberia

Forest Ecosystems 2021年第3期8卷 602-614页

作者： A.Onuchin Т.Burenina А.Shvidenko D.Prysov A.Musokhranova V.N.Sukachev Institute of Forest Siberian Branch of the Russian Academy of Sciences 660036Academgorodok50/28Russia 31KrasnoyarskRussia International Institute for Applied Systems Analysis A-2361 LaxenburgAustria

Background:Assessment of the reasons for the ambiguous influence of forests on the structure of the water balance is the subject of heated debate among forest *** the components of total evaporation,forest vegetation makes a significant contribution to the process of runoff formation,but this process has specific features in different geographical *** issues of the influence of forest vegetation on river runoff in the zonal aspect have not been sufficiently ***:Based on the analysis of the dependence of river runoff on forest cover,using the example of nine catchments located in the forest-tundra,northern and middle taiga of Northern Eurasia,it is shown that the share of forest cover in the total catchment area(percentage of forest cover,FCP)has different effects on runoff *** experiments with the developed empirical models have shown that an increase in forest cover in the catchment area in northern latitudes contributes to an increase in runoff,while in the southern direction(in the middle taiga)extensive woody cover of catchments“works”to reduce *** effectiveness of geographical zonality in regards to the influence of forests on runoff is more pronounced in the forest-tundra zone than in the zones of northern and middle ***:The study of this problem allowed us to analyze various aspects of the hydrological role of forests,and to show that forest ecosystems,depending on environmental conditions and the spatial distribution of forest cover,can transform water regimes in different *** the fact that the process of river runoff formation is controlled by many factors,such as temperature conditions,precipitation regime,geomorphology and the presence of permafrost,the models obtained allow us to reveal general trends in the dependence of the annual river runoff on the percentage of forest cover,at the level of *** results obtained are consistent with the concept of geographic

关键词： River runoff Catchments Forest cover geographic zoning Central Siberia

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The spatial variation of soil bacterial community assembly processes affects the accuracy of source tracking in ten major Chinese cities

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Science China(Life Sciences) 2021年第9期64卷 1546-1559页

作者： Teng Yang Yu Shi Jun Zhu Chang Zhao Jianmei Wang Zhiyong Liu Xiao Fu Xu Liu Jiangwei Yan Meiqing Yuan Haiyan Chu State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Institute of Forensic Science Ministry of Public Security(MPS)Beijing 100038China School of Geography Sciences Nanjing Normal UniversityNanjing 210023China Single-Cell Center CAS Key Laboratory of BiofuelsQingdao Institute of BioEnergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China University of Chinese Academy of Sciences Beijing 100049China Beijing Institute of Genomics Chinese Academy of SciencesBeijing 100101China MPS’Key Laboratory of Forensic Genetics Beijing 100038China

Urban soils harbor billions of bacterial cells and millions of ***,the distribution patterns and assembly processes of bacterial communities remain largely uncharacterized in urban *** is also unknown if we can use the bacteria to track soil sources to certain cities and ***,Illumina MiSeq sequencing was used to survey soil bacterial communities from 529 random plots spanning 61 districts and 10 major cities in *** a 3,000 km range,community similarity declined with increasing geographic distance(Mantel r=0.62),and community composition was clustered by city(R^(2)=0.50).Within cities(geographic patterns were *** analysis showed that homogenizing dispersal and dispersal limitation dominated soil bacterial assembly at small and large spatial scales,***,the probabilities of accurately tracking random soil sources to certain cities and districts were 90.0% and 66.7%,*** the tested samples originated from cities that were more than 1,265 km apart,the soil sources could be identified with nearly 100% ***,this study demonstrates the strong distance-decay relationship and the clear geographic zoning of urban soil bacterial communities among *** varied importance of different community assembly processes at multiple spatial scales strongly affects the accuracy of microbial source tracking.

关键词： urban soil bacteria distribution patterns assembly processes distance-decay relationship geographic zoning dispersal limitation homogenizing dispersal microbial source tracking

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