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Process analysis and mitigation strategies for wetland degradation caused by increasing agricultural water demand:an ecology-economy nexus perspective

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Ecological Processes 2023年第1期12卷 560-572页

作者： Lin Jiang Hui Wang Saige Wang Wen Zhang Institute of Environment and Ecology Shandong Normal UniversityNo.1 Daxue RoadJi’nan 250358ShandongChina School of Environment Beijing Normal UniversityBeijing 100875China

Background Farmland expansion has played a major role in wetland degradation in Heilongjiang Province,China in recent *** expansion increases the demands for water,thereby affecting wetland water cycles,and promoting the shrinkage of wetland areas and degradation of ecosystem *** an open system,agricultural production is limited by both ecological and socioeconomic ***,our understanding of wetland degradation caused by farmland expansion from the perspective of the ecology-economy nexus is *** A correlation between farmland expansion and agricultural economic activities was established,and wetland degradation driven by agroeconomic activities was inversely derived using a multi-regional input-output(MRIO)*** developed an ecology-economy nexus framework to explore the ecological process of the area and water demand tradeoffs between wetland degradation and farmland expansion,the economic process of wetland degradation driven by food consumption,and the nexus between the two *** finally explored strategies to mitigate wetland degradation due to increased agricultural water *** Farmland expansion contributed to 93.76%of the total degraded wetland *** was a significant negative correlation between wetland area and the water consumption for crop production,but no significant correlation between wetland area and the ecological footprint of *** direct wetland degradation caused by local final demand accounted for 63.02%,while the indirect degradation caused by non-local final demand accounted for 36.98%.Hebei,Shandong,Liaoning,Inner Mongolia,and Shanghai were the top five provinces contributing to indirect wetland degradation in *** findings indicated that a mixed scenario combining water footprint reduction per unit yield with food export reduction could maximize wetland restoration while reducing local farmland-wetland competition for *** Our research

关键词： Agricultural economic activities Farmland expansion Water footprint wetland degradation wetland restoration

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Soil Cellulase Activity and Fungal Community Responses to wetland degradation in the Zoige Plateau, China

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Journal of Mountain Science 2015年第2期12卷 471-482页

作者： WU Li-sha FENG Su NIE Yuan-yang ZHOU Jian-hong YANG Zhi-rong ZHANG Jie Key Laboratory of Biological Resource and Ecological Environment of the Ministry of Education College of Life SciencesSichuan University State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University

Four soil types(peat, marsh, meadow, and sandy) in the Zoige Plateau of China are associated with the severity of wetland degradation. The effects of wetland degradation on the structure and abundance of fungal communities and cellulase activity were assessed in these 4 soil types at 3 depths using DGGE(Denatured Gradient Gel Electrophoresis), q PCR(Quantitative Real-time PCR),and 3,5-dinitrosalicylic acid assays. Cellulase activity and abundance of the fungal community declined in parallel to the level of wetland degradation(from least to most disturbed). DGGE analysis indicated a major shift in composition of fungal communities among the4 soil types consistent with the level of *** content(WC), organic carbon(OC), total nitrogen(TN), total phosphorus(TP), available nitrogen(AN), and available phosphorus(AP) were strongly correlated with cellulase activity and the structure and abundance of the fungal *** results indicate that soil physicochemical properties(WC, OC, TN, TP, AN, and AP), cellulase activity, and diversity and abundance of fungal communities are sensitive indicators of the relative level of wetland degradation. WC was the major factorinvolved in Zoige wetland degradation and lower WC levels contributed to declines in the abundance and diversity of the fungal community and reduction in cellulase activity.

关键词： wetland degradation Soil cellulase Fungal community DGGE(Denatured Gradient Gel Electrophoresis) qPCR(Quantitative Real-time PCR)

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Mapping and understanding degradation of alpine wetlands in the northern Maloti-Drakensberg, southern Africa

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Journal of Mountain Science 2024年第9期21卷 2956-2966页

作者： Johan van TOL Department of Soil Crop and Climate SciencesUniversity of the Free StateBloemfontein 9300South Africa

The alpine terrestrials of the Maloti-Drakensberg in southern Africa play crucial roles in ecosystem functions and livelihoods,yet they face escalating degradation from various factors including overgrazing and climate *** study employs advanced Digital Soil Mapping(DSM)techniques coupled with remote sensing to map and assess wetland coverage and degradation in the northern *** model achieved high accuracies of 96%and 92%for training and validation data,respectively,with Kappa statistics of 0.91 and 0.83,marking a pioneering automated attempt at wetland mapping in this *** attributes such as terrain wetness index(TWI)and valley depth(VD)exhibit significant positive correlations with wetland coverage and erosion gully density,Channel Network Depth and slope were negative *** density analysis revealed terrain attributes as dominant factors driving degradation,highlighting the need to consider catchment-specific susceptibility to *** challenge traditional assumptions which mainly attribute wetland degradation to external forces such as livestock overgrazing,ice rate activity and climate *** sensitivity map produced could serve as a basis for Integrated Catchment Management(ICM)projects,facilitating tailored conservation *** research should expand on this work to include other highland areas,explore additional covariates,and categorize wetlands based on hydroperiod and sensitivity to *** comprehensive study underscores the potential of DSM and remote sensing in accurately assessing and managing wetland ecosystems,crucial for sustainable resource management in alpine regions.

关键词： Digital Soil Mapping Gully density Integrated catchment management Remote sensing wetland degradation

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Effects of diet shift on the gut microbiota of the critically endangered Siberian Crane

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Avian Research 2023年第3期14卷 443-452页

作者： Wenjuan Wang Yafang Wang Qing Chen Huifang Ding School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing100083China Center for East Asian–Australasian Flyway Studies Beijing Forestry UniversityBeijing100083China Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity Center for Watershed EcologyInstitute of Life ScienceNanchang UniversityNanchang330031China Jiangxi Poyang Lake wetland Conservation and Restoration National Permanent Scientific Research Base National Ecosystem Research Station of Jiangxi Poyang Lake WetlandNanchang330031China

wetlands worldwide have suffered from serious degradation and transformation,leading to waterbirds increasingly dependent on agricultural fields for *** gut microbiota is an essential component of host health,the impacts of agricultural feeding on gut microbial community and pathogen transmission remain poorly *** fill this knowledge gap,we used 16S rRNA sequencing to characterize the fecal bacterial community of the Siberian Crane(Grus leucogeranus),a Critically Endangered species,that recently has shifted its foraging from largely Vallisneria tubers in Poyang Lake natural wetlands to crops(i.e.,rice seeds and lotus rhizomes) in agricultural *** compared the bacterial communities between tuber foraging cranes and crop foraging *** results indicate that diet shift greatly modified the gut microbiota diversity,composition and *** foraging cranes had higher microbiota diversity than tuber foraging *** alteration in microbiota composition and function were correlated with change in food ***(i.e.,high in fiber)foraging cranes were enriched in Clostridiaceae with fiber digestion ability,and crop(i.e.,high in carbohydrate)foraging cranes were enriched in bacterial taxa and functions related to carbohydrate *** flexibility of gut microbiota might enhance Siberian Cranes’ ability to adapt to novel diet and ***,many enriched families in crop foraging cranes were pathogenic bacteria,which might increase the susceptibility of cranes to pathogenic *** caution should be taken to agricultural feeding waterbirds in Asia,where the widespread poultry-keeping in over-harvested rice fields might increase the transmission probability of pathogenetic bacteria among wild birds,domestic poultry and humans.

关键词： Diet shift Pathogenic bacteria Poyang Lake Siberian Crane Vallisneria tuber wetland degradation

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degradation of wetlands on the Qinghai-Tibet Plateau:A Comparison of the Effectiveness of Three Indicators

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Journal of Mountain Science 2013年第4期10卷 658-667页

作者： GAO Jay LI Xi-lai CHEUNG Alan YANG Yuan-wu School of Environment University of Auckland Private Bag 92019Auckland New Zealand College of Agriculture and Animal Husbandry Qinghai University College of Agriculture and Animal Husbandry Qinghai UniversityXining 810016 China

The Qinghai-Tibet Plateau encompasses a large quantity of wetlands, some of which have been degraded to varying severity levels. In the literature, a number of degradation indicators have been proposed to evaluate ecological health of wetlands, but their effectiveness in the plateau environment remains unknown. In this study, we assessed the effectiveness of three degradation indicators, soil moisture content at lo em deep, vegetative cover, and density of pika burrows. The degradation severity of wetlands in Maduo County on the Qinghai-Tibet Plateau is enumerated at four levels, intact, slight, moderate and severe. Analysis of xo6 samples collected in the field demonstrates that the density of pika burrows is the least reliable indicator. By comparison, vegetative cover and underlying soil moisture content are more reliable, even though neither is a perfect indicator as the difference among adjacent levels of severity as revealed by t-test is not always statistically significant. The imperfection of vegetative cover as an indicator is due to its variation among different types of wetlands. The limitation of moisture content is attributed to its non-linear relationship with wetland degradation. Above the threshold of about 50% in moisture content wetlands are unlikely to be degraded. It is recommended that moisture be measured at the point near the surface and vegetative cover be further differentiated by species in order to improve their effectiveness.

关键词： wetland degradation Grass cover Soilmoisture Pika damage Qinghai-Tibet Plateau

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Re-recognition of the Dajiuhu wetland in Shennongjia Mountains,Central China

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湿地科学 2012年第3期10卷 278-284页

作者： XIAO Fei DU Yun XUE Huaiping LING Feng BAN Xuan Institute of Geodesy and Geophysics Chinese Academy of SciencesWuhan 430077HubeiP.R.China

The Dajiuhu wetland,a famous sub-alpine wetland located in the the Shennongjia Mountains,north-subtropical region of Central China,has suffered from adverse impacts of unsustainable human practices over the past 60 *** Dajiuhu wetland reflects the development process that has been accompanied by human *** on field survey data,high resolution remote sensing image and historical records,the present paper provided a review on exploitation and restoration of the *** results showed that the Dajiuhu wetland degraded quickly from 1950 to *** that time,bog shrinkage,lake disappearance,biodiversity decline,sphagnum reduction,and vegetation succession from wetland communities to terrestrial communities in the Dajiuhu wetland,which were the main manifestations of the wetland *** activities,such as agricultural reclamation and construction of drainage works,have been the main factors resulting in ecological degradation of the wetland since *** and the short-term economic benefits had been the driving forces for wetland drainage and reclamation over the past years.

关键词： mountain wetland Dajiuhu wetland wetland degradation Shennongjia Mountains

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