检索结果-南通市图书馆

Biological weathering of phlogopite during enriched vermicomposting

Pedosphere 2021年第3期31卷 440-451页

作者： Fariba JAFARI Hossein KHADEMI Vajihe SHAHROKH Angel FAZ CANO Jose A.ACOSTA Farhad KHORMALI Department of soil Science College of AgricultureIsfahan University of TechnologyIsfahan 84156-83111Iran Sustainable Use Management and Reclamation of Soil and Water Research GroupUniversidad Politécnica de CartagenaPaseo Alfonso ⅩⅢ48CartagenaMurcia 30203Spain Department of soil Science Gorgan University of Agricultural Science and Natural ResourcesGorgan 49189-43464Iran

As the dominant macrofauna in many soils,earthworms play a significant role in mineral weathering and nutrient release from mineral structures into available forms for root *** is a trioctahedral micaceous mineral that can be weathered to other minerals through release of its interlayer potassium(K).In this study,we investigated the effect of earthworm activities and associated microbial communities on phlogopite weathering during the production of phlogopite-enriched vermicompost with different quantities of phlogopite *** experiment was run under laboratory conditions using three levels of phlogopite(0,20%and 40%by weight)in *** Petri dish contained 20 g of a mixture of cow manure and phlogopite,and vermicomposting process was performed by inoculation of eight Eisenia foetida *** in clay mineralogy and C/N ratio in each dish were assessed at days 0,45,90,135,and 180 during *** results indicated that phlogopite was partially weathered to vermiculite and interstratified mica-vermiculite during the vermicomposting *** rate of weathering was higher during the early stages of vermicomposting(the first 90 d).The weathering of phlogopite was influenced considerably by the activity of earthworms and associated microbial communities during the organic matter transformation *** the early stages of the process,the weathering rate for different levels of phlogopite was not significantly different,but over time it accelerated steadily,and the difference increased.

关键词： C/N ratio earthworm Eisenia foetida enriched vermicompost mineral weathering weathering rate X-ray diffraction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Increased humic materials explain aggregate-protected carbon and nitrogen accumulation in biochar-amended tropical soils

引用

Pedosphere 2024年第6期34卷 1086-1099页

作者： Emmanuel AMOAKWAH Mohammad A.RAHMAN Khandakar R.ISLAM Kwame A.FRIMPONG Christian A.PHARES Louis SACKEY Isaac ASIRIFI Emmanuel ARTHUR Council for Scientific and Industrial research-soil research Institute Accra Center soil Water and Bioenergy Resources The Ohio State University South Centers Department of soil Science College of Agriculture and Natural Sciences School of Agriculture University of Cape Coast Ruhr-Universit?t Bochum Geographic Institute Department of Soil Science and Soil Ecology Department of Agroecology Faculty of Technical Sciences Arhus University

Humic materials make important contributions to soil organic carbon（C） and nitrogen（N） ***,information on the correlation between humic substances and the accumulation of soil aggregate-protected C and N in response to biochar application under tropical agroecosystems is ***,a field trial was conducted to elucidate the effects of biochar on soil aggregate properties and humic materials and how these humic compounds affect aggregate-protected C and N in a humid tropical *** treatments included no-biochar control（CK）,15 Mg biochar ha-1（BC-15）,30Mg biochar ha-1（BC-30）,and 30 Mg biochar ha-1+phosphate fertilizer（BC-30+P）.The treatments BC-30 and BC-30+P significantly increased the contents of humic materials（humic and fulvic acids） as compared to *** was a significant increase in the mean-weight diameter of soil aggregates by3-and 4-fold in BC-30 and BC-30+P,***,BC-30 and BC-30+P led to significant increases in soil structural coefficient by 3-and 4-fold,re spectively,relative to *** increases in organic C and N accumulation were observed in the macroaggregates of the biochar-amended *** relationships between the degree of polymerization and aggregate-protected C and N were observed,implying that low-molecular-weight aliphatic compounds favor organic C and N accumulation with biochar *** important soil property that contributed to organic C and N accumulation in aggregates was fulvic acid content,which could be used as an early and sensitive indicator to notice early changes in aggregate-protected C and N accumulation in soils of the humid tropics.

关键词： degree of humification fulvic acid humic acid macroaggregates soil structural coefficients

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Mulching mode and planting density affect canopy interception loss of rainfall and water use efficiency of dryland maize on the Loess Plateau of China

引用

Journal of Arid Land 2018年第5期10卷 794-808页

作者： ZHENG Jing FAN Junliang ZHANG Fucang YAN Shicheng GUO Jinjin CHEN Dongfeng LI Zhijun Key laboratory of Agricultural soil and water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F University Institute of water-saving Agriculture in Arid Areas of China Northwest A&F University

High and efficient use of limited rainwater resources is of crucial importance for the crop production in arid and semi-arid areas. To investigate the effects of different soil and crop management practices（i.e., mulching mode treatments： flat cultivation with non-mulching, flat cultivation with straw mulching, plastic-covered ridge with bare furrow and plastic-covered ridge with straw-covered furrow; and planting density treatments： low planting density of 45,000 plants/hm^2, medium planting density of 67,500 plants/hm^2 and high planting density of 90,000 plants/hm^2） on rainfall partitioning by dryland maize canopy, especially the resulted net rainfall input beneath the maize canopy, we measured the gross rainfall, throughfall and stemflow at different growth stages of dryland maize in 2015 and 2016 on the Loess Plateau of China. The canopy interception loss was estimated by the water balance method. soil water storage, leaf area index, grain yield（as well as it components） and water use efficiency of dryland maize were measured or calculated. Results showed that the cumulative throughfall, cumulative stemflow and cumulative canopy interception loss during the whole growing season accounted for 42.3%–77.5%, 15.1%–36.3% and 7.4%–21.4% of the total gross rainfall under different treatments, respectively. soil mulching could promote the growth and development of dryland maize and enhance the capability of stemflow production and canopy interception loss, thereby increasing the relative stemflow and relative canopy interception loss and reducing the relative throughfall. The relative stemflow and relative canopy interception loss generally increased with increasing planting density, while the relative throughfall decreased with increasing planting density. During the two experimental years, mulching mode had no significant influence on net rainfall due to the compensation between throughfall and stemflow, whereas planting density significantly affected net rainfall.

关键词： dryland maize throughfall stemflow canopy interception loss yield water use efficiency Loess Plateau

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chemically and biologically activated biochars slow down urea hydrolysis and improve nitrogen use efficiency

引用

Pedosphere 2023年第4期33卷 659-669页

作者： Nazmul H.ANTOR Shamim MIA Md.M.HASAN Nowrose J.LIPI Keiji JINDO Miguel A.SANCHEZ-MONEDERO Md.H.RASHID Department of Agronomy Patuakhali Science and Technology UniversityDumkiPatuakhali 8602(Bangladesh) Agrosystems research Groups Wageningen University and ResearchWageningen 6700 AA(The Netherlands) Department of soil and water Conservation and Organic Waste management Spanish National Research Council(CEBAS-CSIC)Murcia 30100(Spain)

Biochar is considered a potential technology to enhance chemical fertilizer use efficiency through intensification of the interactions between nutrients and the functional groups on biochar ***,little is known about how the application of activated biochars mixed with urea influences nitrogen(N)mineralization and crop performance in paddy ***,a sawdust-derived fresh biochar(FBC)(ca.400℃)was activated chemically with 15%hydrogen peroxide and biologically with a nutrient solution mixed with a soil inoculum to obtain a chemically activated biochar(CBC)and a biologically activated biochar(BBC),*** chemical and surface properties of FBC,CBC,and BBC were evaluated using spectroscopic methods,i.e.,Fourier transform infrared spectroscopy and 13C nuclear magnetic resonance,and potentiometric charge *** N retention capacity of biochars and their interaction with urea hydrolysis were examined in a laboratory incubation ***,a field experiment was carried out in a paddy field with the biochars unmixed or mixed with urea at a 1:1 *** results showed that negative surface functional groups and negative charges were increased on both activated biochars,especially *** activated biochars contributed to a significant reduction in urea-biochar suspension pH and increased N retention in the incubation *** the enhanced surface properties of the activated biochars,no similar increases in rice biomass and grain yield were observed for these biochars in the field ***,rice biomass,grain yield,apparent N use efficiency,and agronomic N use efficiency were significantly higher with the application of the three biochars compared to no-biochar ***,the results indicate that the application of urea mixed with biochar could enhance crop performance,especially in the case of activated biochar,which would enhance N retention in the soil,reducing N loss.

关键词： chemical property crop yield functionalized biochar nitrogen uptake nutrient use efficiency pyrolysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rainfall and Tillage Impacts on soil Erosion of Sloping Cropland with Subtropical Monsoon Climate- A Case Study in Hilly Purple soil area, China

引用

Journal of Mountain Science 2015年第1期12卷 134-144页

作者： TANG Jia-liang CHENG Xun-qiang ZHU Bo GAO Mei-rong WANG Tao ZHANG Xi-feng ZHAO Pei YOU Xiang Key laboratory of Mountain Environment Evolution and Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences Provincial Monitoring Station of soil and water Conservation

Under global warming, storm events tend to intensify, particularly in monsoon-affected regions. As an important agricultural area in China, the purple soil region in the Sichuan Basin, where it has a prevailing monsoon climate, is threatened by serious soil erosion. Tillage operations alter runoff and soil erosion processes on croplands by changing the physical properties of the soil surface. To clarify the relationship between tillage and soil erosion in the purple soil region, three different tillage practices in this region were investigated at the plot scale over 4 years： bare land with minimum tillage （BL）, conventional tillage （CT） and seasonal no-tillage ridges （SNTR） which was initially designed to prevent soil erosion by contoured ridges and no-tillage techniques. The results showed that although there were no significant differences in the surface runoff and soil erosion among the three oractices, BL caused relatively high surface runoff and soil erosion, followed by CT and SNTR. Classification and comparison of the rainfall events based on cluster analysis （CA） verified that the surface runoff was not significantly different between most intensive event and long intensive events but was significantly different between most intensive and short and medium-duration events. Only the rainfall events with the highest rainfall intensity could trigger serious soil erosion, up to 1000 kg ha^-1 in the region. Further detailed investigations on the effects of tillage operations on the soil erosion in a subtropical region with a monsoon climate are needed to provide a basis for modeling catchments and designing better management practices.

关键词： soil erosion Purple soil Tillage types Rainfall intensity Cluster analysis.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Forest management for optimizing soil protection:a landscape-level approach

引用

Forest Ecosystems 2021年第4期8卷 672-684页

作者： Ana Raquel Rodrigues Susete Marques Brigite Botequim Marco Marto Jose G.Borges Forest research Centre and laboratory TERRA School of AgricultureUniversity of LisbonTapada da Ajuda1349-017 LisbonPortugal

Background:soil erosion is still identified as the main cause of land degradation worldwide,threatening soil functions and driving several research and policy efforts to reverse *** are commonly associated to some of the most successful land-use systems to achieve soil protection goals,but the extent to which forest ecosystems reduce erosion risks can largely depend on management decisions and associated silvicultural *** tools can assist foresters in solving the complex planning problem they face,concerning the demand for different,and often conflicting,ecosystem services.A resource capability model(RCM),based on a linear programming approach,was built and solved for a forest landscape management problem in Northwest Portugal,over a 90-years planning horizon,divided in 10-years ***:Timber provision and soil erosion were found to be in *** management alternatives included in the model were proven to be sufficiently flexible to obtain the desired level of timber yield,both in volume and even distribution along the planning horizon,while ensuring lower levels of soil loss estimates(below 35 Mg·ha^(−1)·year^(−1)).However,under climate change conditions,compatible with an increasing greenhouse gases emission scenario,potential landscape soil erosion may be enhanced up to 46 Mg·ha^(−1)·year^(−1) in critical ***:soil conservation concerns in landscape-level forest management planning can be addressed by LPbased optimization *** providing an optimal management solution at landscape level,this approach enables a comprehensive analysis of the RCM,possible trade-offs and potential changes towards uncertainties.

关键词： Ecosystem services Erosion Optimization Silvicultural practices

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative effects of nitrogen application on growth and nitrogen use in a winter wheat/summer maize rotation system

引用

Journal of Integrative Agriculture 2017年第9期16卷 2062-2072页

作者： YIN Min-hua LI Yuan-nong XU Yuan-bo Key laboratory of Agricultural soil and water Engineering in Arid and Semiarid Areas Ministry of Education/College of Water Resources and Architectural EngineeringNorthwest A&F UniversityYangling 712100P.R.China

The application of fertilizer in agricultural production has become universally common for achieving high crop yields and economic benefits, but it has potential impacts on food safety, energy crisis and environmental pollution. Optimal management of fertilization is thus necessary for maintaining sustainable agriculture. Two-year（2013–2015） field experiment was conducted, in Yangling（108°24′E, 34°20′N, and 521 m a.s.l.）, Shaanxi Province, China, to explore the effects of different nitrogen（N） applications on biomass accumulation, crop N uptake, nitrate N（NO_3~–-N） distribution, yield, and N use with a winter wheat/summer maize rotation system. The N applications consisted of conventional urea（U）（at 80（U80）, 160（U160）, and 240（U240） kg N ha^（–1）; 40% applied as a basal fertilizer and 60% top-dressed at jointing stage） and controlled-release urea（CRU）（at 60（C60）, 120（C120）, 180（C180）, and 240（C240） kg N ha~（^（–1））; all applied as a basal fertilizer） with no N application as a control（CK）. The continuous release of N from CRU matched well with the N demands of crop throughout entire growing stages. soil NO_3~–-N content varied less and peaked shallower in CRU than that in urea treatments. The differences, however, were smaller in winter wheat than that in summer maize seasons. The average yield of summer maize was the highest in C120 in CRU treatments and in U160 in urea treatments, and apparent N use efficiency（NUE） and N agronomic efficiency（NAE） were higher in C120 than in U160 by averages of 22.67 and 41.91%, respectively. The average yield of winter wheat was the highest in C180 in CRU treatments and in U240 in urea treatments with C180 increasing NUE and NAE by averages of 14.89 and 35.62% over U240, respectively. The annual yields under the two N fertilizers were the highest in C120 and U160. The results suggested that CRU as a basal fertilizer once could be a promising alternative of urea as split application in semiarid areas.

关键词： controlled-release urea nitrogen availability soil fertility nitrogen use efficiency soil productivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of Vegetation on Runoff and Sediment in Wind-water Erosion Crisscross Region in the Upper Yellow River of China

引用

Chinese Geographical Science 2017年第4期27卷 569-576页

作者： WANG Jinhua LI Zhanbin YAO Wenyi DONG Guotao Xi'an University of Technology Xi'an 710048China Key laboratory of soil and water Loss Process and Control on the Loess Plateau of Ministry of water Resources Yellow River Institute of Hydraulic ResearcesZhengzhou 450003China

All characteristics of vegetation,runoff and sediment from 1960 to 2010 in the Xiliu Gully watershed,which is a representative watershed in wind-water erosion crisscross region in the upper reaches of the Yellow River of China,have been analyzed in this *** on the remote sensing image data,and used multi-spectral interpretation method,the characteristics of vegetation variation in the Xiliu Gully watershed have been *** the rules of precipitation,runoff and sediment's changes have been illuminated by using mathematical statistics ***′s more,the influence mechanism of vegetation on runoff and sediment has been discussed by using the data obtained from artificial rainfall simulation *** results showed that the main vegetation type was given priority to low coverage,and the area of the low vegetation coverage type was reducing year by *** the country,the area of the high vegetation coverage type was gradually *** a word,vegetation conditions had got better improved since 2000 when the watershed management project *** average annual precipitation of the river basin also got slightly increase in 2000–*** average annual runoff reduced by 37.5%,and the average annual sediment reduced by 73.9% in the same *** results of artificial rainfall simulation tests showed that the improvement of vegetation coverage could increase not only soil infiltration but also vegetation evapotranspiration,and then made the rainfall-induced runoff production *** root system could increases the resistance ability of soil to erosion,and vegetation aboveground part could reduce raindrop kinetic energy and splash soil ***,with the increase of vegetation coverage,the rainfall-induced sediment could decrease.

关键词： vegetation coverage runoff sediment infiltration rate wind-water erosion crisscross region

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical Simulation of soil water Dynamics in a Drip Irrigated Cotton Field Under Plastic Mulch

引用

Pedosphere 2013年第5期23卷 620-635页

作者： LIU Mei-Xian YANG Jing-Song LI Xiao-Ming YU Mei WANG Jin State Key laboratory of soil and Sustainable Agriculture Institute of soil Science Chinese Academy of Sciences Institute of Subtropical Agriculture Chinese Academy of Sciences water Conservancy Bureau of Yuhuatai Wulanwusu Agro-Meteorological Experiment Station

Drip irrigation under plastic mulch has been widely applied in arid Northwest China as a water-saving irrigation technology. A comprehensive knowledge of the distribution and movement of soil water in root zone is essential for the design and management of irrigation regimes. Simulation models have been proved to be efficient methods for this purpose. In this study, the numerical model Hydrus-2D was used to simulate the temporal variations of soil water content in a drip irrigated cotton field under mulching. A concept of partitioning coefficient, calibrated to be 0.07, was introduced to describe the effect of plastic mulch on prevention of evaporation. The soil hydraulic parameters were optimized by inverse solution using the field data. At the optimized conditions, the model was used to predict soil water content for four field treatments. The agreements between the predictions and observations were evaluated using coefficient of determination （R2） and root mean square error （RMSE）. The results suggested that the model fairly reproduced the variations in soil water content at all locations in four treatments, with R2 ranging from 0.582 to 0.826 and RMSE from 0.029 to 0.050 cm3 cm-3, indicating that the simulations agreed well with the observations.

关键词： arid area drip irrigation evapotranspiration Hydrus-2D model root zone

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geospatial Mapping of soil Nitrate-Nitrogen Distribution Under a Mixed-Land Use System

引用

Pedosphere 2009年第4期19卷 434-445页

作者： S. LAMSAL C. M. BLISS D. A. GRAETZ School of Forest Resources and Conservation University of Florida USDA Forest Service Southern Research Station soil and water Science Department University of Florida

Mapping the spatial distribution of soil nitrate-nitrogen （NO3=N） is important to guide nitrogen application as well as to assess environmental risk of NO3-N leaching into the groundwater. We employed univariate and hybrid geostatistical methods to map the spatial distribution of soil NO3-N across a landscape in northeast Florida. soil samples were collected from four depth increments （0-30, 30-60, 60-120 and 120-180 cm） from 147 sampling locations identified using a stratified random and nested sampling design based on soil, land use and elevation strata. soil NO3-N distributions in the top two layers were spatially autocorrelated and mapped using lognormal kriging. Environmental correlation models for NO3-N prediction were derived using linear and non-linear regression methods, and employed to develop NO3-N trend maps. Land use and its related variables derived from satellite imagery were identified as important variables to predict NO3-N using environmental correlation models. While lognormal kriging produced smoothly varying maps, trend maps derived from environmental correlation models generated spatially heterogeneous maps. Trend maps were combined with ordinary kriging predictions of trend model residuals to develop regression kriging prediction maps, which gave the best NO3-N predictions. As land use and remotely sensed data are readily available and have much finer spatial resolution compared to field sampled soils, our findings suggested the efficacy of environmental correlation models based on land use and remotely sensed data for landscape scale mapping of soil NO3-N. The methodologies implemented are transferable for mapping of soil NO3-N in other landscapes.

关键词： environmental correlation general linear model kriging land use regression

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：