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Agricultural Biotechnology 2024年第4期13卷 57-62页

作者： Yue YAN Zebin CHEN Qingmei LI Shengguang XU Zhiwei FAN Li LIN Song JIN Tianfang WANG Zaixiang ZHU College of Agronomy and Life Sciences Kunming UniversityKunming 650214China

At present,long-term continuous cropping in agricultural production has formed a relatively common development *** the increase of continuous cropping years,soil phenolic acids are also affected to varying *** paper summarized the effects of continuous cropping on soil phenolic acids and the research progress of continuous cropping obstacle reduction techniques,aiming at providing theoretical basis and technical support for the research of continuous cropping obstacle reduction techniques and promoting the healthy and sustainable development of modern agriculture.

关键词： soil Phenolic acid Continuous cropping obstacle Reduction technique soil improvement

Effects of Different Afforestation Techniques on soil Nutrients in Populus alba Woodland

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Meteorological and Environmental Research 2018年第4期9卷 15-18页

作者： Ye Yanhui Gao Yi Han Yanying Liu Yunlong Cheng Jiale Da Buqiong Ye Hong Resources & Environment College Tibet Agriculture & Animal Husbandry University

[Objective] The research aimed to study the influence of different afforestation technology measures on soil nutrients of P. alba wood-land in arid valley region of Rikaze, Tibet. It aimed to improve afforestation technology measure in arid valley region of Rikaze, Tibet, and provide theoretic basis for restoring the degraded ecosystem at upper reaches of the Yarlung Zangbo River. [ Method] In arid valley region of Duojiao Vil-lage, Nanmulin County, Rikaze City, the planted land using rooting powder, egg shell, leaves, mud and water retention agent was taken as re-search object, while the land without any afforestation measures was taken as the control, to determine soil nutrients under different afforestation measures. [Result] Under different afforestation measures, the contents of various soil nutrients were all obviously higher than control, in which available potassium, available phosphorus, alkali hydrolysable nitrogen and organic matter in soil obviously increased than control, but there was no similar rule among different measures. [Conclusion] Vegetation restoration in dry valley belt of Rikaze by different afforestation measures is favorable for improving physical-chemical properties of soil and increasing soil fertility.

关键词： soil improvement soil nutrient Rikaze of Tibet Populus alba

Effects of Continuous Cropping on soil Microbial Flora and Research Progress of Continuous Cropping Obstacle Reduction Techniques

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Agricultural Biotechnology 2024年第5期13卷 49-54页

作者： Qingmei LI Zebin CHEN Yue YAN Shengguang XU Zhiwei FAN Li LIN Song JIN Tianfang WANG Zaixiang ZHU College of Agronomy and Life Sciences Kunming UniversityKunming 650214China

Continuous cropping can bring economic benefits in a short time and meet the growing demand of agricultural products such as grain,but long-term continuous cropping will accelerate soil degradation,lead to the reduction of crop yield and the increase of disease rate,and destroy the balance of soil microbial ***,it is not conducive to the sustainable development of soil *** this paper,the problems caused by continuous cropping,such as imbalance of soil microbial flora,decrease of biodiversity,accumulation of root exudates and their effects on soil fertility and crop growth,were summarized,and some measures were suggested to alleviate the obstacles of continuous cropping,such as reasonable rotation,adjustment of intercropping planting mode and application of biological ***,the paper also looked forward to the development trend of continuous cropping obstacle reduction techniques,including the integration and application of biological techniques,the promotion of green ecological techniques and the application of intelligent management *** study provides theoretical basis and technical support for the research of continuous cropping obstacle reduction techniques and promote the healthy and sustainable development of modern agriculture.

关键词： soil Microorganism Continuous cropping obstacle Reduction technique soil improvement

improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technology

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Biogeotechnics

Biogeotechnics 2024年第1期2卷 33-44页

作者： Xiaorong Wang Chi Li Yanru Shi Zhenguo Zhang Qingguo Chi Panshi Wang College of Civil Engineering Inner Mongolia University of TechnologyHohhot 010051China Key Lab.of University of Geological Hazards and Geotechnical Engineering Defense in Sandy Drought and Cold RegionsHohhot 010051China Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering Inner Mongolia University of TechnologyHohhot 010051China College of Resources and Environmental Engineering Inner Mongolia University of TechnologyHohhot 010051China Inner Mongolia Academy of Science and Technology Hohhot 010020China

soil desertification and salinization are the main environmental disasters in arid and semi-arid *** is of great significance to study the water-salt migration law of saline soil and propose corresponding water-salt regulation and control ***-induced calcite precipitation(MICP)technology was proposed to improve saline soil based on salt inhibition,and the water–salt–heat coupling migration law and salt-frost heave deformation law of saline soil before and after improvement were studied using soil column model ***1#,XR2#(Saline-alkali-tolerant mineralization bacteria isolated from saline soil)and Sporosarcina pasteurii were used in the MICP improvement and the effect of XR1#was the *** high-temperature evaporation,the water migration change rate,water loss rate,accumulated evaporation amount,and accumulated salt content of the improved soil columns within a depth range of 0–40 cm were reduced by an average of 53.6%,47.3%,69.5%,and 40%,respectively,compared with the untreated soil *** low-temperature cooling,the characteristics of water-salt migration changed significantly,and the deformation of salt-frost heave decreased *** water-salt content at the freezing point(−4.5°C)changed from a cliff-like steep drop(untreated saline soil)to a slow decrease at environmental temperature(MICP-treated saline soil),and the amount of water crystallization decreased from 81%to 56.7%at−5°*** the end of the cooling process,the amount of salt-frost heaving on the surface of the soil columns decreased by an average of 62.7%.Based on the measured data,a numerical simulation was conducted using the HYDRUS-1D model,which had good reliability and accurately simulated and predicted the law of water-salt migration in saline soil under the conditions of microbial solidification and *** technology significantly reduced the change rate of water-salt migration and water evaporation in saline soil,hindered salt accumulation,and

关键词： Microbial-induced calcite precipitation(MICP) Saline soil soil improvement Water-salt transport

Bohai Granary:Harnessing the Saline-Alkali Lands

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Bulletin of the Chinese Academy of Sciences 2024年第4期38卷 244-250页

作者： LIU Xiaojing Center for Agricultural Resources Research Institute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuang 050022China

Agriculture forms the backbone of a nation,and food security is essential for social stability and sustainable economic *** China,ensuring adequate food production is not only critical for national well-being but also a strategic priority for maintaining *** enhance food security,two key approaches are increasing yields from the existing agricultural lands and improving the productivity of low-and medium-yield *** of China’s major underutilized resources is its extensive saline-alkali lands,which,despite historically low productivity due to poor soil conditions and scarce freshwater resources,hold immense potential for boosting grain *** this,the Chinese Academy of Sciences,in collaboration with the Chinese Ministry of Science and Technology(MOST),initiated the“Bohai Granary Scientific and Technological Demonstration Project”(Bohai Granary Project for short)in partnership with three provinces and one municipality-Hebei,Shandong,Liaoning,and *** project represents a landmark effort to rehabilitate saline-alkali lands and transform them into highly productive grain-producing regions,thereby contributing significantly to China’s food security *** this article,the author revisits the key milestones,technological breakthroughs,and outlook on the future potential of this project.

关键词： food security saline-alkali land Bohai Granary Project soil improvement agricultural innovation

Analysis on Green Development Strategy of Xinjiang Cotton

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Meteorological and Environmental Research 2019年第1期10卷 19-25页

作者： Tian Liwen Tian Conghua Cui Jianping Lin Tao Cash Crop Institute Xinjiang Academy of Agricultural Sciences Institute of Agricultural Economics and Technology Information Xinjiang Academy of Agricultural Sciences

Through on-the-spot investigation and survey in Xinjiang cotton region and relevant data( containing statistical data,online information and government documents,etc.),the characteristics of water resource,wind-sand disaster,soil salinization,cotton diseases,insect pests and weeds in Xinjiang are studied. It is proposed reasons and specific programmes of green development strategy of Xinjiang cotton,and specific strategies contain ecological water supply,land desertification control,soil improvement,and ecological control of diseases,insect pests and weeds,thereby providing the support for sustainable development of Xinjiang cotton.

关键词： Xinjiang cotton Green development Ecological water supply Land desertification control soil improvement Ecological control of diseases insect pests and weeds

The Effect of Jet Grouting on Enhancing the Lateral Behavior of Piled Raft Foundation in Soft Clay(Numerical Investigation)

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Advances in Geological and Geotechnical Engineering Research 2023年第1期5卷 24-39页

作者： Mostafa Esawwaf Wasiem Azzam Naha Eghrouby Faculty of Engineering Tanta UniversityTanta31511Egypt

Soft clay soils cannot usually support large lateral loads,so clay soils must be improved to increase lateral *** jet grouting method is one of the methods used to improve weak *** this paper,a series of 3D finite element studies were conducted using Plaxis 3D software to investigate the lateral behavior of piled rafts in improved soft clay utilizing the jet grouting *** models were analyzed to explore the influence of the width,depth,and location of the grouted clay on the lateral ***,the effect of vertical loads on the lateral behavior of piled rafts in grouted clay was also *** numerical results indicate that the lateral resistance increases by increasing the dimensions of the jet grouting beneath and around the piled *** increases in lateral resistance are 11.2%,65%,177%,and 35%for applying jet grouting beside the raft,below the raft,below and around the raft,and grouted strips parallel to lateral loads,*** was also found that increasing the depth of grouted clay enhances lateral resistance up to a certain depth,about 6 to 10 times the pile diameter(6 to 10D).In contrast,the improvement ratio is limited beyond ***,the results demonstrate that the presence of vertical loads has a significant impact on sideward resistance.

关键词： Finite element analysis Plaxis 3D Lateral bearing capacity Jet grouting Piled raft soil improvement

improvement of silty clay by vacuum preloading incorporated with electroosmotic method

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Journal of Rock Mechanics and Geotechnical Engineering 2010年第4期2卷 365-372页

作者： M. Q. Vu Department of soil Mechanics and Foundation Engineering National University of Civil Engineering

A laboratory test was performed to assess the effectiveness of vacuum preloading incorporated with electroosmotic (EOM) treatment on silty clay (combined method) for reclamation projects like new disposal ponds, where the horizontal electrode configurations beneath the soil layer were possible and the drainage pipes and the prefabricated vertical drains (PVDs) system could be easily installed in advance before the sludge dragged from sea bed or river bed was filled into the site. Three groups of tests were conducted on the silty clay from Qinhuai River in Nanjing, China. The model is able to apply vacuum pressure at the bottom of the soil layer and a direct current electric field simultaneously. It is also possible to measure the pore pressures at different depths of soil column, and the changes in settlement and volume with the elapsed time. In this study, the vacuum preloading method, vacuum preloading applied at the bottom (VAB method), was applied and the cathodes were installed beneath the soil layer. The results obtained indicate substantial reduction in water content, and increases in dry density and undrained shear strength in comparison with those obtained by the vacuum preloading only, particularly at the positions close to the anode. The combined method utilizes the vertical drainage flow created by the electroosmosis integrating the horizontal drainage flow created mostly by the vacuum pressure. The total drainage flow can be calculated as a result of the vertical drainage flow by electroosmosis only and the horizontal drainage flow by the vacuum preloading only. The way of placement of the cathode and the anode in the combined method also overcomes the disadvantage of EOM method itself, i.e. the appearance of cracks between the anode and the surrounding soil. Moreover, it is observed that the vacuum preloading plays a primary role in earlier stage in deduction of free pore water; meanwhile, the electroosmotic method is more efficient in later stage for

关键词： vacuum preloading VAB method soil improvement consolidation pore pressure undrained shear strength dry density electroosmotic method

Densification of Reclaimed soils with the Utilization of the Vibro Compaction Technique—A Case Study

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Open Journal of Civil Engineering 2023年第2期13卷 263-281页

作者： Emmanouil Spyropoulos Bedros Avakian Saudi Aramco Dhahran Kingdom of Saudi Arabia Menard Middle East Dubai United Arab Emirates

This paper presents a case study of the extensive soil improvement work carried out on a reclamation project on the shores of United Arab Emirates. The project consisted an area of approximately 480,000 m2 for recreation purposes. Following the dredging work, approximately 6.8 million cubic meters underwent densification using the vibrocompaction method. The general aims of such analysis are to investigate the effectiveness of vibrocompaction as a method of soil improvement and appraise the selection of this method as the most appropriate soil treatment technique necessary for the adequate densification of the overall loose soil masses. The efficiency of the vibrocompaction technique to densify thick granular-based soil formations of considerable thickness and the benefits obtained, equated to other soil treatment methods, was assessed through a comprehensive post quality control program including field and laboratory post-compaction testing. Based on the analysis conducted it is concluded that soil strength of the reclaimed materials achieved a noteworthy improvement reaching comfortably the required degrees of densification.

关键词： Reclamation Dredging Manmade Islands Compaction soil improvement

Effects of Rotating Summer Green Manure Crops and Straw Returning in Paddy Field on Rice Quality and Yield

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Agricultural Biotechnology 2018年第4期7卷 161-164,171页

作者： Fang QIN Tianming SU Lirong SU Qin LI Chengcheng ZENG Guangxi Academy of Agricultural Sciences Nanning 530007China

[Objectives] The aim was to explore the biological mechanism of green manure on improving soil fertility in paddy soil.[Methods] Early rice （chemical fertilizer） was used as a control to study the effects of returning green manure crops of mung bean, lablab bean to paddy fields and organic manure application on the bulk density, nutrient content, nutrient content and yield of rice soil.[Results] The soil bulk density in each treatment was significantly lower than that of the basic soil. The soil bulk density of treatment I was the least of 1.52 g/cm 3. The nitrogen content of rice in treatment IV was significantly higher than that of treatment I, treatment II, and treatment III. The phosphorus and potassium contents of rice in treatment III and treatment IV were significantly higher than those of treatment I and treatment II. Returning green manure crops to field and applying organic fertilizers could increase the polished rice ratio and reduce the chalkiness degree, chalkiness ratio and protein content of rice. The gel consistency of rice grain in treatment I was significantly higher than that of treatment II, treatment III and treatment IV. The rice of treatment III had the highest number of effective panicles per plant, 1 000-grain weight, theoretical yield and actual yield, respectively, 14.07 panicles/plant, 32.58 g, 6 236.27 kg/hm^2 and 5 086.80 kg/hm^2.[Conclusions] This study provided a theoretical basis for proposing good green manure varieties suitable for the continuous improvement of paddy soil quality.

关键词： Green manure soil improvement Lablab bean Yield