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Impact of agricultural intensification on soil organic carbon＂ A study using DNDC in Huantai County, Shandong Province, China

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Journal of Integrative Agriculture 2016年第6期15卷 1364-1375页

作者： LIAO Yan WU Wen-liang MENG Fan-qiao LI Hu College of Resources and Environmental Sciences China Agricultural University/Beijing Key Laboratory of Biodiversity and Organic Farming Beijing 100193 P.R. China Chinese Academy of agricultural Engineering Beijing 100125 P.R. China Institute of agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China

Using the biogeochemical model den itrification/decomposition （DN DC）, the dynamic changes of soil organic carbon （SOC） of farmland from the 1980s to 2030s were investigated in Huantai County, a typical intensive agricultural region in the Huang- Huai-Hai Plain of China. Prior to modelling, validation of the DNDC model against field data sets of SOC from Quzhou Experimental Station in the Huang-Huai-Hai Plain was conducted at the site scale. We compared the simulated results with the observed SOC in Huantai County during 1982-2011 under two different classification methods of simulation unit （the first method integrated soil type and land use of Huantai County to form the overlapped modeling units; the second selected the 11 administrative towns as the modeling units）, and achieved a high accuracy in the model simulation with the improvement of the model parameters. Regional SOC （0-20 cm） density and stocks for Huantai County in the years 2012-2031 were predicted under different scenarios of farming management. Compared with current management practices, optimized fertilization （20% decrease of mineral N）, crop straw incorporation （90%） and appropriate animal manure input （40 kg N ha-1 yr-1） could achieve the highest level of SOC density （56.8% higher than 2011） in the period of 2012-2031. The research highlighted the importance of crop straw incorporation, optimized N fertilization and integration of crop production with ani- mal husbandry on the farmland carbon sequestration for maintaining a high land productivity in the Huang-Huai-Hai Plain.

关键词： agricultural intensification soil organic carbon DNDC nitrogen fertilizer straw incorporation animal manure

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Arbuscular mycorrhizal fungi reduce ammonia emissions under different land-use types in agro-pastoral areas

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Pedosphere 2024年第2期34卷 497-507页

作者： Huaisong WANG Rui GUO Yibo TIAN Nan CUI Xinxin WANG Lei WANG Zhongbao YANG Shuying LI Jixun GUO Lianxuan SHI Tao ZHANG Institute of Grassland Science Northeast Normal UniversityKey Laboratory of Vegetation EcologyMinistry of EducationJilin Songnen Grassland Ecosystem National Observation and Research StationChangchun 130024China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesKey Laboratory of Dryland AgricultureMinistry of AgricultureBeijing 100081China Mountainous Area Research Institute of Hebei Province Hebei Agricultural UniversityBaoding 071001China College of Agronomy Liaocheng UniversityLiaocheng 252059China The Key Laboratory of Plant Development and Environmental Adaptation Biology Ministry of EducationSchool of Life ScienceShandong UniversityQingdao 266237China Forestry and Grassland Bureau of Aohan Banner Chifeng 024005China

Ammonia(NH3)emissions,the most important nitrogen(N)loss form,always induce a series of environmental problems such as increased frequency of regional haze pollution,accelerated N deposition,and N *** mycorrhizal(AM)fungi play key roles in N ***,it is still unclear whether AM fungi can alleviate N losses by reducing *** potential mechanisms by which AM fungi reduce NH_(3)emissions in five land-use types(grazed grassland,mowed grassland,fenced grassland,artificial alfalfa grassland,and cropland)were explored in this *** showed that AM fungal inoculation significantly reduced NH3emissions,and the mycorrhizal responses of NH3emissions were determined by land-use *** equation modeling(SEM)showed that AM fungi and land-use type directly affected NH_(3)*** addition,the reduction in NH_(3)emissions was largely driven by the decline in soil NH_(4)^(+)-N and pH and the increases in abundances of ammonia-oxidizing archaea(AOA)amoA and bacteria(AOB)amoB genes,urease activity,and plant N uptake induced by AM fungal inoculation and land-use *** present results highlight that reducing the negative influence of agricultural intensification caused by land-use type changes on AM fungi should be considered to reduce N losses in agriculture and grassland ecosystems.

关键词： agricultural intensification grassland management functional genes plant N uptake N leaching N loss

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Multiple Cropping Intensity in China Derived from Agro-meteorological Observations and MODIS Data

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Chinese Geographical Science 2014年第2期24卷 205-219页

作者： YAN Huimin XIAO Xiangming HUANG Heqing LIU Jiyuan CHEN Jingqing BAI Xuehong Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Department of Botany and Microbiology Center for Spatial AnalysisUniversity of Oklahoma

Double-and triple-cropping in a year have played a very important role in meeting the rising need for food in ***,the intensified agricultural practices have significantly altered biogeochemical cycles and soil *** and mapping cropping intensity in China′s agricultural systems are therefore necessary to better estimate carbon,nitrogen and water fluxes within agro-ecosystems on the national *** this study,we investigated the spatial pattern of crop calendar and multiple cropping rotations in China using phenological records from 394 agro-meteorological stations(AMSs)across *** results from the analysis of in situ field observations were used to develop a new algorithm that identifies the spatial distribution of multiple cropping in China from moderate resolution imaging spectroradiometer(MODIS)time series data with a 500 m spatial resolution and an 8-day temporal *** to the MODIS-derived multiple cropping distribution in 2002,the proportion of cropland cultivated with multiple crops reached 34%in ***-cropping accounted for approximately 94.6%and triple-cropping for 5.4%.The results demonstrat that MODIS EVI(Enhanced Vegetation Index)time series data have the capability and potential to delineate the dynamics of double-and triple-cropping *** resultant multiple cropping map could be used to evaluate the impacts of agricultural intensification on biogeochemical cycles.

关键词： agricultural intensification multiple-cropping crop calendar agro-meteorological observation moderate resolution imaging spectroradiometer(MODIS)

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Identification of agricultural systems in the mountains of Northeast Thailand

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Journal of Mountain Science 2018年第2期15卷 419-429页

作者： Sukanlaya CHOENKWAN A. Terry RAMBO Program on System Approaches in Agriculture Faculty of agriculture Khon Kaen University Khon Kaen 40002 Thailand Department of agricultural Extension Faculty of agriculture Khon Kaen University Khon Kaen 40002 Thailand East-West Center 1601 East-West Road Honolulu HI 96848-1601 USA

agricultural systems in Thailand's northeastern mountains are described in terms of their type of crops, marketing channels, and labor requirements. Five distinctive systems are identified: The Field crop system, Fruit tree system, Industrial tree plantation system, Specialty crop system and Agro-tourism system. The different systems are compared with each other in order to identify their respective strengths and weaknesses as development models. The Field crop system covers the largest area of agricultural land and is found in all mountainous villages but it generates very low net profits per hectare. The Specialty crop system and Agro-tourism system generate very high net profits per hectare but cover only a small land area and have a restricted spatial distribution. Expansion of these high value systems may be limited because they are capital and labor intensive and require highly skilled farmers to manage them successfully. If these constraints can be overcome, they may offer a useful model for mountain agricultural development.

关键词： agricultural system analysis Specialtycrop Agro-tourism Mountain development agricultural system agricultural intensification

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Cropland expansion facilitated the outbreak of cereal aphids during 1951–2010 in China

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Science Bulletin 2015年第11期60卷 1036-1037,1062页

作者： Zi-Hua Zhao Fang Ouyang Feng Ge State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of Zoology Chinese Academy of Sciences Department of Entomology College of Agriculture and Biotechnology China Agricultural University

Landscape-scale pattern could affect ecosystem service such as biocontrol of agricultural pests. Additionally, pest outbreak has been shown to be interwoven with land-use intensity. In the present research, we collected and analysed the 60-year data of cereal aphids and wheat area during 1951–2010 in China. Regression model was applied to analyse the relationship between pest damage and cropland expansion. Results showed that the percentage of cereal aphid outbreak area in wheat area increased rapidly during 1951–2010. It was 9 % during 1951–1960, while it was above 60 % during 2001–2010. In addition, effect of cropland expansion on damage of cereal aphids was significantly positive, which indicated that cropland expansion in agricultural landscape may enhance pest damage ***, we concluded that cropland expansion was one of the most important drivers of increasing pest outbreak,which should be considered in sustainable management of cereal aphids combined with other factor(e.g. climate changes and resistant variety) at large spatiotemporal scale.

关键词： agricultural intensification Cereal aphids Biocontrol Ecosystem service Scale

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Functional diversity and trait composition of butterfly and bird communities in farmlands of Central Romania

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Ecosystem Health and Sustainability 2015年第10期1卷 17-25页

作者： Jan Hanspach Jacqueline Loos Ine Dorresteijn Henrik vonWehrden Cosmin Ioan Moga Alin David Leuphana University Faculty of SustainabilityScharnhorststrasse 121335 LueneburgGermany Leuphana University Center for MethodsScharnhorststrasse 121335 LueneburgGermany Educational-Ecological Association Ecotransilvania Tabacarilor 11A545400 SighisoaraRomania Department of Taxonomy and Ecology Babes-Bolyai UniversityClinicilor Strada 5-7400006 Cluj-NapocaRomania

Cultural landscapes all over the world harbor species communities that are taxonomically and functionally *** Eastern Europe,but also in many other regions of the world,the conservation of this farmland biodiversity is threatened by land use intensification and *** order to counteract the negative effects of land use change in such landscapes,a thorough understanding of the functional relationships between species and their environment is *** this study,we investigated the relationship of functional traits of butterfly and bird communities and environmental conditions in 120 sites in traditional farmlands of southern Transylvania,***,we compared taxonomic diversity(i.e.,Shannon diversity)with functional diversity(i.e.,functional dispersion),and second,we linked species traits to environmental variables by performing RLQ *** traits indicating reproduction,movement,and feeding behavior related with environmental variables describing heterogeneity,amount of woody vegetation,and topography at three different spatial *** found positive relationships between taxonomic and functional diversity,as well as strong linkages between species traits and environmental conditions for both ***,butterfly composition was most strongly influenced by land use type and life-history *** composition was most strongly related to the amount of woody vegetation and nesting and foraging *** conclude that maintaining the typical features of traditional farming landscapes,especially a small-scale heterogeneity in arable land and gradients of woody vegetation cover,would be desirable in order to sustain a high functional diversity in southern Transylvania in the future.

关键词： agricultural intensification bird communities butterfly communities farmland heterogeneity land abandonment low-intensive agriculture RLQ analysis Transylvania,Romania

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Habitat preferences, flight cost and foraging strategies in the European Starling breeding in a heterogeneous agricultural landscape

Habitat preferences, flight cost and foraging strategies in ...

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23rd International Ornithological Congress

作者： Mns Bruun Henrik G.Smith Dennis Hassequist Lund University Ecological inst. Dept. of animal ecology Ecology building S-223 62 Lund Sweden Lund University Ecological inst. Dept. of animal ecology. Ecology building S-223 62 Lund Sweden henrik Lund University Ecological inst. Dept. of animal ecology Ecology building S-223 62 Lund Sweden

＜正＞ The European Starling has, like many other bird species associated with the agricultural landscape in Western Europe, declined in numbers during the last decades. This decline might be explained by changes in agricultural practices affecting the abundance and availability of food for breeding birds. Using radio-tracking, we evaluate the consequences of land-use on both food delivery rate to nestlings and foraging costs to parents. Starlings

关键词： Habitat preference foraging strategy agricultural intensification nestling diet

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