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17 tomato cultivars inoculated with larva nematodes were used in this paper to investigate their resistance to root knot nenatodes. The results showed that gall index of LA1312, 3601, HA4402, LA1007 were higher than other tomato cultivars. Compared with control ‘Caihong101’, root activity of LA0655 was higher, and the lowest root activity was observed in 3601, whose gall index was the highest among...
In the last decade, the role of NO in plants has received much attention. Due to its multifunctional activities in plants, NO is now being considered as a new candidate plant hormone. However, it is not very clear that the physiological mechanism of exogenous NO alleviates salt effects in vegetable plants. Therefore, an experiment was conducted to study the effects of exogenous NO on physiological...
According to the concentrations of Cr, Cu, Zn, As, Cd and Pb in the latosol f rom the West of Hainan Island, the integrated pollution effect of heavy metals of these latosol is evaluated by the technique of single factor index and Hakanson ecological risk.The results show that the average concentration of Cr, Cu, Zn, As, Cd and Pb is 39.245 mg/kg, 36.937 mg/kg, 57.997mg/kg , 17.606mg/kg, 0.198mg/kg,...
In this study we selected humidity index, days of sand wind in winter and spring, the texture of soil and the vegetation coverage as four indicators, to analysis and evaluation the desertification sensitivity of ChengDe regions by using the database of GIS technique evaluation factor. Results indicates that the desertification sensitivity of Chengde regions level is divided into three levels, namely...
Three different plasticity index subgrade soil are selected from seasonal frozen soil region. Static triaxial test is executed on the samples exposed to 0 to 7 times closed-system freeze-thaw cycles under different confining pressures. Resilient modulus is obtained from the line segment of deviator stress-strain curve. The results show that the resilient modulus of the same kind of soil increases...
Based on RS, GIS and statistical analysis, this paper discusses the relationship of rural settlement spatial distribution and topography, landform, soil erosion, economic development, as well as achieves the classification of population pressure in Huanren County in Eastean Mountain Areas. The results show that the distribution pattern of rural settlement is affected obviously by elevation, slope,...
Microstructure surface undulation is an important parameter to denote the loess microstructure characteristics, but the current studies are mostly qualitative and quantitative two-dimensional analysis, which difficult to reflect the situation of soil microstructure surface undulation. Analysis based on the microstructure characteristics of loess in western Liaoning, translate the gray value which...
Focus on major eco-environment problems in Dongjiangyuan area, the paper selected twelve evaluation indexes (including terrain, climate, soil, vegetation index, land use type, socio-economic data) were set up based on RS and GIS technology. Using 100 m×100 m real area as basic unit, the spatial principal components analysis method is apply to calculate the eco-environment synthesis exponent according...
The paper achieved identifying the Agricultural Non-point Source Pollution Critical Source Area in Xingkai Lake watershed using pollution index method with the help of RS and GIS. The conclusions were that: (1) the high pollution risk area mainly clustered in the border of ZhiYi, Baipaozi, Xingkaihu and Liumao Towns and the west southern area of Yangmu Town, and the serious soil erosion and high livestock...
Based on the red clay of Wuhan reinforced by Ionic Soil Stabilizer, the red clay was treated by different matches of ISS and water at first, then was tested in the Atterberg limits test and unconfined compressive strength test. The results show that the plastic index decreases, and unconfined compressive strength increases after mixing the ISS into the red clay. In addition, strength of ISS-reinforced...
Tanzania has two seasons in a year (dry and rain seasons), the problem of road impassability in rural areas of Tanzania throughout a year was studied under site investigation (field testing) and laboratory tests. The study investigated mineralogical reactive of native rural roads soil with lime, materials properties and characteristics of lime stabilized layers under critical structural performances...
Shandong province which is located in a warm temperate monsoon climate zone is rich in agricultural resource. However, Drought is the most serious natural disasters of it. There is an important period for the wheat harvest before the Mound Closure which could ensure the enough number of the wheat tillering. Within the wheat growing stages, Density of vegetation cover is a gradually changing from bare...
Distribution patterns of four seedling populations of the mangrove Avicennia marina in Southern-China Coast were analyzed using the multifractal method of fractal theory. The results showed that the patterns exhibited multi-scaling and multifractal behavior varying with the scales of observation. With q values changing from −2 to 4, values of Dq ranged from 1.078 to 1.997, ƒ(α) from 0.402 to 1.678,...
The ecological benefits of 10 perennial ornamental grasses named Andropogon scoparius, Bouteloua curtipendula, Bouteloua gracili, Stipa grandis, Festuca arundinacea, Elytrigia repens, Elymus nutans, Agropyron cristatum, Dactylis glomerata and Bromus inermis were studied by determining their ability of CO2 fixation and O2 release, capacity of water releasing and energy absorbed by transpiration, dust...
The study revised the evaluation index of the single factor Precipitation R value of the soil erosion sensitivity on the basis of USLE. In the support of GIS software, the study had a hierarchical and comprehensive evaluation about the impact factors of the soil erosion sensitivity. Results show that mild sensitive area accounts for 42%, moderate sensitive area accounts for 22%, highly sensitive area...
The RS and GIS research new technologies which suitable for large-scale regions research and the landscape index analysis method were used to study the overall land use pattern characteristics and dynamics trends of Xinzheng city from 1995 to 2000 by analyzing the remote sensing image maps. Results show that: the building lands increases unceasingly, forest land, meadow and waters area gradually reduced;...
Researchers at home and abroad are mainly focused on the bearing capacity, effects of soil plug and pile driving of PHC pipe piles. However, little attention is paid to property variation of soil before and after their installation especially when different installation technology is adopted. For further study of engineering property of PHC pipe pile composite foundation, the property variation of...
Phenolic acids was a group of allelochemicals with relatively high activity which was reported to have significant accumulation in soil of continuous cropping poplar plantations. The impact of phenolic acids on growth and development of poplars was essential in researches on degradation mechanism of forestland productivity. The effect of phenolic acids on detailed roots morphologic changes of poplars...
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