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soil type-dependent effects of drying-wetting sequences on aggregates and their associated OC and N

International soil and Water Conservation Research 2022年第4期10卷 649-661页

作者： Na Mao Xiaorong Wei Mingan Shao State Key Laboratory of soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water ResourcesYangling712100China Institute of soil and Water Conservation Northwest A&F UniversityYangling712100China CAS Center for Excellence in Quaternary Science and Global Change Xi'an710061China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China

Evaluating the impacts of drying-wetting(DW)cycles on soil aggregates and their associated organic carbon(OC)and nitrogen(N)is crucial to understand the OC and N *** are likely subjected to DW cycles with different sequences depending on seasons or in ***,studies on how DW sequences influence OC and N dynamics within aggregates,and whether this effect is dependent on soil type,are relatively ***,two DW sequences,i.e.,drying-wetting-dryingwetting(2DW)and wetting-drying-wetting-drying(2WD)treatments were designed,and a consistent wetting(CW)was set as a control to assess the effects of DW *** soils(Entisol,Ultisol,Anthrosol and Mollisol)varying in texture and OC content were *** aggregate size distribution,the OC,total N(TN),readily oxidizable OC(ROOC)and mineral N(Min-N)content in aggregates were *** showed that 2DW treatment increased but 2WD treatment decreased the large aggregates of Entisol and Ultisol,while 2DW and 2WD treatments synchronously increased the large aggregates of Anthrosol but decreased them of *** DW treatments increased the OC in each aggregate of Entisol,Anthrosol and Mollisol but decreased them of *** 2DW didn't affect but 2WD treatment decreased ROOC in 1e2 mm aggregates of Entisol andsoil type with DW sequences on aggregate turnover and OC and N cycling should be reconsidered to provide more precisive evidences for global C and N cycles under the scenario of future climate changes.

关键词： Aggregates Carbon Nitrogen Drying-wetting sequences soil type

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Influence of water potential and soil type on conventional japonica super rice yield and soil enzyme activities

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Journal of Integrative Agriculture 2017年第5期16卷 1044-1052页

作者： ZHANG Jing WANG Hai-bin LIU Juan CHEN Hao DU Yan-xiu LI Jun-zhou SUN Hong-zheng PENG Ting ZHAO Quan-zhi College of Agronomy Henan Agricultural University/Collaborative Innovation Center of Henan Grain Crops/Henan Key Laboratory of Rice BiologyZhengzhou 450002P.R.China

We carried out a pool culture experiment to determine the optimal water treatment depth in loam and clay soils during the late growth stage of super rice. Three controlled water depth treatments of 0-5, 0-10 and 0-15 cm below the soil surface were established using alternate wetting and drying irrigation, and the soil water potential （0 to -25 kPa） was measured at 5, 10 and 15 cm. A 2-cm water layer was used as the control. We measured soil enzyme activities, root antioxidant enzyme activities, chlorophyll fluorescence parameters, and rice yield. The results showed that the 0-5-cm water depth treatment significantly increased root antioxidant enzyme activities in loam soil compared with the control, whereas soil enzyme activities, chlorophyll fluorescence parameters and yield did not differ from those of the control. The 0-10- and 0-15-cm water depth treatments also increased root antioxidant enzyme activities, whereas soil enzyme activities, chlorophyll fluorescence parameters and yield decreased. In clay soil, the soil enzyme activities, root antioxidant enzyme activities, chlorophyll fluorescence parameters, and yield did not change with the 0-5-cm water treatment, whereas the 0-10- and 0-15-cm water treatments improved these parameters. Therefore,the appropriate depths for soil water during the late growth period of rice with a 0 to -25 kPa water potential were 5 cm in loam and 15 cm in clay soil.

关键词： rice yield components soil type soil enzyme activity antioxidant enzyme activity chlorophyll fluorescence parameters water potential

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Spatial patterns of insect herbivory within a forest landscape:the role of soil type and forest stratum

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Forest Ecosystems 2021年第4期8卷 923-936页

作者： Xinliang Shao Qin Zhang Xitian Yang Key Laboratory of Plant Genetics and Molecular Breeding Zhoukou Normal University466001 ZhoukouChina College of Forestry Henan Agricultural University450002 ZhengzhouChina

Background:Insect herbivory has profound impacts on ecosystem processes and *** many efforts have been made to recognize the main drivers of insect herbivory at different scales,the results are *** likely reason is that studies have insufficiently captured the spatially heterogeneous factors such as soil type and forest stratum within the stand that may significantly affect insect *** particular,there is a lack of studies that address the detailed spatial patterns of insect herbivory which are influenced by these ***:We measured the detailed spatial patterns of insect herbivory on cork oak(Quercus variabilis Bl.)in response to soil type(gravel soil and loam)and forest stratum(the upper,lower,and sapling stratum),and correlated these patterns with a set of influencing factors(litter coverage,coverage of shrubs and herbs,soil nutrients,soil moisture,and leaf traits)in a forest ***:Generally,insect herbivory was spatially heterogeneous within *** was significantly lower in gravel soil areas than in loam soil areas and the highest herbivory occurred in the lower ***,there were also 41 individual plots in which the highest herbivory occurred in the upper stratum and 29 plots in which the highest herbivory occurred in the sapling *** were significant differences in soil nutrient and water status between soil types,but no significant differences in leaf *** effects of forest stratum on leaf traits were also inconsistent with those on insect ***:Leaf traits may not be the main factors influencing insect herbivory in the *** type may have major effects on herbivory patterns by influencing litter coverage while higher coverage of shrubs and herbs may reduce herbivory in the sapling *** findings may advance our understanding of tree-herbivore interactions in real-world situations and have important implications for the sustainable managemen

关键词： Forest stratum Heterogeneity Insect herbivory Leaf litter Leaf traits soil nutrient soil type

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Impact of soil type Used in Tunneling on Land Subsidence and Mobility Effective Time under Different Earthquake Records

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Open Journal of Geology 2016年第11期6卷 1469-1480页

作者： Arash Rostami Alireza Firoozfar Behnam Adhami Nima Asghari Department of Civil Engineering Islamic Azad University Central Tehran Branch Tehran Iran Department of Civil Engineering University of Zanjan Zanjan Iran Department of Civil Engineering Noshirvani University of Technology Babol Iran

During recent decades, tunnels construction in urban environments has been recognized as a useful factor in improving transportation situation in cities. Construction of underground structures like tunnels has a direct impact on the above-ground structures. The most important impacts are soil crust movement of the structure movement), acceleration change of the earthquake on structures, and land subsidence. The present research aims at seismic evaluation of the effect of soil type in land subsidence and effective mobility time in tunneling projects. For this purpose, two different soil types are chosen to model and assess factors using numerical methods. The outcome of this research concludes that tunneling changes in the dominant frequency record if these changes reach to the extent that structure frequency equals to record frequency, resonance phenomenon happens.

关键词： soil type Dominant Frequency Movement Duration soil Subsidence

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soil Organic Carbon Stock Variation under Different soil types and Land Uses in the Sub-Humid Noun Plain, Western Cameroon

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Open Journal of soil Science 2024年第4期14卷 191-209页

作者： Frank Abigail Sobze Kenfack Georges Kogge Kome Achille Bienvenue Ibrahim Viviane Pauline Mandah Dieudonne Bitondo Department of soil Science Faculty of Agronomy and Agricultural Sciences (FASA) University of Dschang Dschang Cameroon Department of Land Surveying National Advanced School of Public Works Yaound&#233 Cameroon International Institute of Tropical Agriculture Cameroon Eco-Regional Center HFS Yaound&#233 Cameroon Department of Earth Science Faculty of Science University of Dschang Dschang Cameroon

This study was conducted to assess the current stock of soil organic carbon under different agricultural land uses, soil types and soil depths in the Noun plain in western Cameroon. Three sites were selected for the study, namely Mangoum, Makeka and Fossang, representative of the three dominant soil types of the noun plain (Andosols, Acrisols and Ferralsols). Three land uses were selected per site including natural vegetation, agroforest and crop field. soil was sampled at three depths;0 - 20 cm, 20 - 40 cm, and 40 - 60 cm. Analysis of variance showed that soil type did not significantly influence carbon storage, but rather land uses and soil depth. SOCS decreased significantly with depth in all the sites, with an average stock of 66.3 ± 15.8 tC/ha at 0 - 20 cm, compared to an average stock of 33.3 ± 7.4 tC/ha at 40 - 60 cm. SOCS was significantly highest in the natural formation with 57.2 ± 19.7 tC/ha, and lowest in cultivated fields, at 37.7 ± 10.6 tC/ha. Andosols, with their high content of coarse fragments, stored less organic carbon than Ferralsols and Acrisols.

关键词： Carbon Stocks soil type soil Depth Agricultural Land Use Noun Plain

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Experimental and analytical investigation on friction resistance force between buried coated pressurized steel pipes and soil

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Frontiers of Structural and Civil Engineering 2024年第4期18卷 615-629页

作者： Shaurav ALAM Tanvir MANZUR John MATTHEWS Chris BARTLETT Erez ALLOUCHE Brent KEIL John KRAFT Department of Civil Engineering and Construction Engineering Technology Louisiana Tech UniversityRustonLA 71270USA Department of Civil Engineering Bangladesh University of Engineering and TechnologyDhaka 1000Bangladesh Georgia Tech Research Institute AtlantaGA 30332USA Stantec Inc. Edmonton T5J0K4Canada North West Pipe Company VancouverWA 98684USA

This paper presents an analytical approach for estimating frictional resistance to pipe movement at soil and external pipe surface of buried coated pressurized steel pipes relative to the internal thrust *** proposed analytical method was developed based on 36 experiments,which involved three coating types(cement mortar(CM),polyurethane type-I(PT-I),prefabricated plastic tape(PPT))on pipes’surfaces,three different soils(pea-gravel(PG),sand(S),silty-clay(SC)),and four simulated over burden depths above the pipe’s *** showed frictional resistance decreased with increasing over burden depth above the pipe’s *** degree of frictional resistance at the pipe-soil interface was found to be in the order of PG>SC>S for all coating variations and overburden *** coated pipe buried in all three types of soil produced significantly higher frictional resistance as compared to other coating *** on experimental data,the developed analytical introduced a dimensionless factor“Z”,which included effects of types of coatings,soil,and overburden depths for simplified rapid *** showed that the method provided a better prediction of frictional resistance forces,in comparison to previous analytical methods,which were barely close in predicting friction resistance for different coating variations,soil types,and overburden *** resistance force values reported herein could be considered conservative.

关键词： friction resistance force thrust force coated pressurized steel pipe soil type overburden depth

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Effects of Typical soil and Stratification Thickness on Water Infiltration Characteristics in Central Ningxia

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Meteorological and Environmental Research 2024年第4期15卷 58-65页

作者： Tianwen ZHANG Wei CHEN Xiaoying CHEN Rongjun ZHI Lin CHEN Haibo ZHANG Wei LIANG Ningxia Hui Autonomous Region Institute of Mineral Geology Yinchuan 750021China Key Laboratory of Restoration and Reconstruction of Degraded Ecosystems in Northwest China Ministry of Education(Ningxia University)Yinchuan 750021China College of Ecology and Environment Ningxia UniversityYinchuan 750021China

In order to compare the influence of different soil types and stratification on water infiltration capacity,two main types of soil in the desert steppe,sierozem(S)and aeolian sandy soil(A),were selected,and infiltration simulation tests were conducted on homogeneous soil and layered soil(layer thickness 5,10,and 20 cm),*** results show that during the whole experiment,there was a small difference between S5A95(aeolian sandy soil 95 cm thick was covered with sierozem 5 cm thick)and S10A90(aeolian sandy soil 90 cm thick was covered with sierozem 10 cm thick)in the wetting front process,infiltration rate and cumulative infiltration,but there was a significant difference between S5A95 and S20A80(aeolian sandy soil 80 cm thick was covered with sierozem 20 cm thick).In the initial infiltration stage,there was no significant difference between A5S95(sierozem 95 cm thick was covered with aeolian sandy soil 5 cm thick)and A10S90(sierozem 90 cm thick was covered with aeolian sandy soil 10 cm thick).However,with the increase of infiltration time,the wetting front process,A5S95,A10S90 and A20S80 had significant differences in terms of wetting front process,infiltration rate and cumulative *** infiltration capacity of A was significantly higher than that of *** with linear R 2 value and model parameters,the three infiltration models were comprehensively compared,and the fitting process and results of the general empirical model for the infiltration process of homogeneous soil and layered soil showed good *** models were used to simulate the water infiltration process of layered soil with different textures,and the order of the effect is as follows:general empirical model>Kostiakov model>Philip *** type and layer thickness had a great influence on water infiltration *** sierozem was covered with aeolian sandy soil 20 cm thick,the infiltration capacity was the *** aeolian sandy soil was covered with sierozem 10 cm thic

关键词： soil type Layer thickness Water infiltration Desert steppe

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Physiological and biomass partitioning shifts to water stress under distinct soil types in Populus deltoides saplings

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Journal of Plant Ecology 2020年第5期13卷 545-553页

作者： Senlin Yang Jian Shi Lianghua Chen Jian Zhang Danju Zhang Zhenfeng Xu Jiujin Xiao Peng Zhu Yang Liu Tiantian Lin Li Zhang Hanbo Yang Yu Zhong Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province&National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River&Rainy Area of West China Plantation Ecosystem Permanent Scientific Research Base Institute of Ecology&ForestrySichuan Agricultural UniversityChengdu 611130China

Aims Although soil environments exist extensive heterogeneity for many plants with a wide range of distribution,researches about effects of soil conditions on plants’tolerance and adaptation are particularly *** our study,the aims are to reveal physiological strategies of Populus deltoides against drought stress under different soil conditions and to select the most suitable soil type for *** *** Under controlled conditions,we used *** as a model species to detect differences in gas exchange rate,antioxidative capacity,nitrogen metabolism and biomass accumulation and partitioning in response to drought stress under three mineral soil types with distinct physicochemical characters,*** soil(RS),yellow soil(YS)and yellow-brown soil(BS).Important Findings Exposure to 25%of field water holding capacity in soil for 3 months had significantly decreased biomass of all organs,photosynthetic rate,enzyme activities related to N assimilation,but increased H2O2,malondialdehyde and content of both NO3−and NH4+,when *** was planted in both RS and *** contrast,under BS,there are slightly negative effects exerted by water deficit on total biomass,gas exchange rate,activities of enzymes related to nitrogen metabolism and membrane damage caused by reactive oxygen species,which can be associated with a consistent increase in superoxide dismutase,peroxidase and catalase,and a higher ratio of root mass to shoot *** is concluded that,such higher capacity in tolerance and adaptation against drought stress under BS relative to both RS and YS could be accounted for more sufficient nutrient provision in soil parental materials and better soil aeration conditions which play a vital role in plant acclimation to water *** study also revealed that,distribution areas of BS might be preferable for cultivation of ***,when compared with those of RS and YS.

关键词： drought stress abiotic stress Populus soil type nitrogen metabolism

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Factors Influencing the Acidification Trends in Agriculture soils: A Case Study of Slovakia

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Journal of Geoscience and Environment Protection 2024年第9期12卷 269-282页

作者： Jarmila Makovníková Stanislav Kološta Boris Pálka National Agricultural and Food Centre/soil Science and Conservation Research Institute Bratislava Regional Station Banská Bystica Slovakia Faculty of Ecomonics Matej Bel University in Banská Bystrica Tajovského Banská Bystrica Slovakia

This study aims to evaluate the development of soil reaction values in 15 key localities of soil Partial Monitoring System from 1994 to 2023, and to identify the most important regional drivers of pH value development. soil samples were collected from the depth 0 - 0.10 m yearly in the spring (5 samples from each locality). In the dry soil, samples were determined actively and exchanged soil reaction. The most significant negative changes (decreases of soil reaction) were determined in Haplic Stagnosols group and Cambisols group. The pH value in topsoil is primarily controlled by soil type and soil substrate, soil management and land use, and to a lesser extent by climatic region.

关键词： pH Value Acidification Climatic Region soil type

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soil properties drive the bacterial community to cadmium contamination in the rhizosphere of two contrasting wheat(Triticum aestivum L.)genotypes

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Journal of Environmental Sciences 2023年第6期128卷 117-128页

作者： Min Lu Lukuan Huang Qiong Wang Xuerui Cao Qiang Lin Zhenli He Ying Feng Xiaoe Yang Key Laboratory of Environmental Remediation and Ecosystem Health Ministry of Education(MOE)College of Environmental and Resources SciencesZhejiang UniversityHangzhou 310058China Tea Research Institute Shandong Academy of Agricultural SciencesJinan 250100China College of Ecology Taiyuan University of TechnologyTaiyuan 030024China Zhejiang Institute of Landscape Plants and Flowers Hangzhou 311251China University of Florida Institute of Food and Agricultural SciencesIndian River Research and Education CenterFort PierceFL 34945USA

Cadmium(Cd)bioavailability in the rhizosphere makes an important difference in grain Cd accumulation in ***,pot experiments combined with 16S rRNA gene sequencing were conducted to compare the Cd bioavailability and bacterial community in the rhizosphere of two wheat(Triticum aestivum L.)genotypes,a low-Cd-accumulating genotype in grains(LT)and a high-Cd-accumulating genotype in grains(HT),grown on four different soils with Cd *** showed that there was non-significant difference in total Cd concentration among four ***,except for black soil,DTPA-Cd concentrations in HT rhizospheres were higher than those of LT in fluvisol,paddy soil and purple *** of 16S rRNA gene sequencing showed that soil type(52.7%)was the strongest determinant of root-associated community,while there were still some differences in rhizosphere bacterial community composition between twowheat *** specifically colonized in HT rhizosphere(Acidobacteria,Gemmatimonadetes,Bacteroidetes and Deltaproteobacteria)could participate inmetal activation,whereas LT rhizosphere was highly enriched by plant growth-promoting *** addition,PICRUSt2 analysis also predicted high relative abundances of imputed functional profiles related to membrane transport and amino acid metabolism in HT *** results revealed that the rhizosphere bacterial community may be an important factor regulating Cd uptake and accumulation in wheat and indicated that the high Cd-accumulating cultivar might improve Cd bioavailability in the rhizosphere by recruiting taxa related to Cd activation,thus promoting Cd uptake and accumulation.

关键词： Cadmium(Cd) Bioavailability Rhizosphere Bacterial community soil type Wheat genotypes

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