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Contour hedgerow can efficiently improve soil structure and its ecological performance, retain soil nutrients and prevent non-point pollutants in sloping land. Effects of Leucaena Leucocephala hedgerow on the physical properties in 0-20 cm and 20-40 cm soil layer were evaluated under two kinds of land utilization patterns in 1.471%, 1.504% plots on sloping land in the purple soil area. Results indicate...
Through experiments in standard runoff plots, this paper studied effects of leucaena leucocephala hedgerow and vetiver hedgerow on bulk density, particle distribution and nutrient loss of the surface soil (the soil depth was 0–20 cm) of sloping farmland in the purple soil area, Sichuan, China. Results showed that: (1) the two hedgerows can reduce soil bulk density, and vetiver hedgerow had a bigger...
Priority assessment for rural roads is difficult due to different objective and subjective factors and needed to cooperate with the local administrative units and repair disaster damage information indeed master of the regional situation. The issues of AHP (Analytic Hierarchy Process) proposed Professor T.L. Saaty in 1980 is applied in this study to establish a comprehensive series of assessment tables...
The success of ecological recovery depends on the plants selection. The thirty-one typical sample plots were selected along Wushen road at different elevation in this article. The trees, shrubs, and grasses of the thirty-one typical sample plots were investigated in winter and spring detailedly. And the main plant kinds were obtained. The composition of plants and common plants were analyzed at different...
Both Loess Plateau and Northeast Phaeozem Region of China are main ecologically fragile regions in China. The unique climate conditions and intensified human activities may alter the soil organic carbon (SOC) content in these regions, and hence affect the carbon cycle of terrestrial ecosystem and climate change. In order to understand the mechanism of organic carbon transformation under those specific...
Polyacrylamide-degrading fungus was selected from the soil in the chemical plant producting polyacrylamide, and it was named PAMF4. It is capable of utilizing polyacrylamide as sole nitrogen source. According to the morphological characteristics and 18S rRNA sequence analysis, the strain was preliminarily identified as Geotrichum candidum. As the indices with PAMF4 growth and polyacrylamide degradation...
In this paper, it has been studied accounting of natural disaster reduction activities. It defines the characters and scope of natural disaster reduction activities, discusses the distinction from environmental protection activities. And natural disaster reduction activities are divided in this paper, which to define the structure of natural disaster reduce industry. Finally, it constructs the framework...
Because of the complex in calculating with coefficient Ø in P-III frequency curve and the difficult in planning with normal probability paper in existing frequency computation, so excel cannot be applied directly to the frequency computation. Plan the normal probability paper in existing frequency computation using the the formidable graph function of Excel software, calculate the coefficient Ø in...
This paper had the retrospective assessment of land consolidation project implementation ecological effects in Guangxi for the past few years. Firstly this paper summarized the differences of implementation situation of land arrangements, including the land smooth, the land development and land reclamation, simultaneously drew the spatial distribution of the situation. Then, typical cases had been...
Sandy prairie over-grazing and tourism passengers directly to forage, soil was trampled damages the soil compaction, the original structure and some physical properties, causing damage to vegetation growth environment, cannot normal growth, grassland phenomenon also increasingly serious soil erosion, so through investigation the soil quality, tourist traffic control etc. In order to research the tourism...
By interpretation of TM images respectively in 1990, 2000 and 2005, the map of current land use of the 5 km buffer zone around Taihu Lake in Jiangsu Province was compiled. Through overlaying, spatial analysis and statistic analysis supported by ArcGIS 9.2 software, the map of land use change rule and land cover in this area were showed, and the environmental impacts caused by the change of land use...
LUCC research is the focus of the study of entironment change, according to statistical and survey data, land use survey data and TM imagines from 1982 to 2008, analyzed the dynamic changes of LUCC in ShangHuang experiment area during the last 27 years. Based upon which, the major driving forces that influence the changes of land resources are discussed. The results indicated that throughout the study...
According to statistical and survey data, land use survey data and TM imagines from 2000 to 2008, dynamic changes of quantitative and regional difference of land use in ShangHuang experiment area during the last 8 years are analyzed. Based upon the model of Markov's shift matrix, the land use changes are discussed. The results indicated that the general trend of cultivated land during the past 8 years...
Based on the fact that severe water erosion is mainly caused by a few torrential rains of the year, this paper derives relationship between runoff velocity variations, energy increase in per width runoff and runoff concentration caused by nonuniformity of slope, with mechanical analysis of the main dynamic, surface runoff on the slope. The result shows that the value of energy increase in per width...
Northern Shaanxi is part of typical arid and semi-arid area of the Loess Plateau. Having been deteriorated by human and other factors for a long period, its natural ecology is extraordinarily vulnerable. It is very urgent and significant to restore and regenerate vegetation in order to improve the ecological environment here. This paper first analyzes the ecological and geographical characteristics...
In order to analyze the order and complexity of land resource utilization in Loess Hilly and Gully region, based on dissipative structure theory, the entropy exchange model were set up which according to the characters of utilizations of land resource in Loess Hilly and Gully region. Three types of information entropy were constructed, including protection and harness, production and environment entropy...
The Chinese traditional folk-house provides a basic comfortable living-space for people since long time. The article focuses on the ecological strategy of choosing site in traditional folk-house. Base on a great deal of literature and examples, the author concludes some strategy from different angles, such as orientation, soil, water, wind, plant, topography and so on. Then, the article gains the...
Seasonal changes in the fine-grained soil conditions caused by the freeze-thaw cycle of their physical and mechanical properties of the changes to the actual construction harm. Through indoor uniform orthogonal test explore and study the fine-grained soil in different water content, density, soluble salt content and clay content conditions, the different cycles of freezing and thawing, use direct...
Through a series of direct shear tests on the interfaces between soil-soil and soil-roots of Artemisia sphaerocephala and Sabina valgaris, friction properties of the interface were examined, and the influence of normal stress, dry density of soil, water content of soil on friction properties were analyzed. The results showed that the shear relationship of interface between soil-roots of Artemisia...
In this paper, we investigate the influence on shear strength of the roots of four typical plants which can fix the soil in coal mining subsidence area by direct shear tests ,and the shear strength of the root soil composite .The results indicate that with the same root diameter (1.25 mm) , Sabina valgsris Ant., Salix psammophila, Caragannmicrophylla Lam. Artemisia sphaerocephala Krasch are more intensive...
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