搜索结果: 31-45 共查到“知识库 土壤地理学”相关记录184条 . 查询时间(2.804 秒)
Proposal for a method for Colluvisol delineation in Chernozem region
soil erosion terrain modelling soil cover structure soil mapping
2015/2/4
Erosion, which is one of the most important exogenous processes forming the landscape, has become a main degradation factor affecting agroecosystems. One of the direct erosion effects is a change in t...
Effect of temperature on the distribution of polycyclic aromatic hydrocarbons in soil and sediment
sorption desorption thermodynamic parameters polycyclic aromatic hydrocarbons
2015/2/4
The knowledge of sorption-desorption processes of polycyclic aromatic hydrocarbons (PAHs) in natural solids is essential to predict the fate, transport, and environmental risks of these pollutants. In...
Assessing the stream water quality dynamics in connection with land use in agricultural catchments of different scales
nitrates land use drinking water reservoir basins GIS
2015/2/4
The ecological status of many surface waters in the Czech Republic is poor, mainly due to still relatively high discharges of N substances especially from agriculture. High nitrate values in the strea...
Creating of digital surface model and orthophoto from ASTER satellite data and their application in land/water research
remote sensing ASTER digital surface model orthophoto
2015/2/4
Satellite data has become a commonly used information source. Landscapes components such as water, inorganic substances, vegetation, and the atmosphere may be distinguished making use of their spectra...
The structural porosity in soil hydraulic functions – a review
soil structure bi-modal soils soil water retention unsaturated conductivity pore size distribution structural pore domain matrix pore domain
2015/2/3
Products of biological processes are the dominant factor of soil structure formation in A horizons, while in B horizons their role is less expressed. Soil structure influences dominantly the structura...
Comparison of soil maps with different scales and details belonging to the same area
detailed soil map reconnaissance soil map geographic information system
2015/2/3
Two different soil maps prepared by different institutes at scales of 1:200 000 and 1:25 000 covering identical areas were compared to determine the accuracy of reconnaissance. These soil maps are wid...
Using the sensitivity of biomass production to soil water for physiological drought evaluation
physiological drought soil water content transpiration biomass production mathematical modelling maize
2015/2/3
The analysis of drought as a phenomenon and the proposal of how to define and quantify the deficiency of water in soil for plants, so called physiological drought, are described. The presented approac...
A relationship between the verdure system and land use planning of a small town
small town verdure system functional and spatial structure
2015/1/22
Small towns are defined as towns with the population not exceeding 15,000 (20,000) residents. They are organisms that can be embraced visually, mostly with the clearly demarcated area. Residents know ...
Land use and Land cover Change in parts of Punjab Satluj Floodplain (India): A Geospatial Analytical Overview from 1975 – 2011
Land use Land cover Floodplain Land change science
2014/11/19
Land use and land cover change in part of Satluj flood plain is the analytical overview of the
changing Man - Environment relationship. This research theme includes two important
components i.e. l...
Developing an Efficient Cover Cropping System for Maximum Nitrogen Recovery in Massachusetts
automated lysimeter corn silage gepgraphical information system Nitrogen management rye winter cover crop soil water sampler
2014/11/4
Time of planting plays a critical role in nitrogen (N) uptake by rye cover crop (CC). Even a few days of delay in planting can severely decrease CC performance. Evaluating the amount of N accumulation...
磺草酮在土壤中的淋溶特性研究
磺草酮 超高效液相色谱-串联质谱 土壤 淋溶
2016/3/17
基于所建立的土壤中磺草酮残留的超高效液相色谱-串联质谱分析方法,通过土壤薄层层析试验研究了磺草酮在中国3种典型土壤中的淋溶特性。结果表明:添加水平为1和10 mg/kg时,磺草酮在土壤中的添加回收率为80%～104%,相对标准偏差为1.2%～8.1%,最低检测浓度为0.1 mg/kg。磺草酮在河北潮土、湖南红土和吉林黑土中的比移值(Rf)分别为 0.563、0.101 和0.422,其在潮土和黑土...
坡面细沟发育特征及其对流速分布的影响
细沟侵蚀 坡度 雨强 流速
2013/9/18
利用模拟降雨试验，采用2个雨强（1.5 mm min-1，2.0 mm min-1），4个坡度（10°，15°，20°，25°），对杨凌塿土细沟发育的特征及其坡面流速分布规律进行了研究。结果表明，坡度增加会造成细沟溯源侵蚀及下切侵蚀的加剧，但随着坡度的增加，总侵蚀量的增幅趋于平缓，暗示可能存在坡面侵蚀量由强转弱的临界坡度。坡度与各侵蚀指标间均表现出极显著的相关性，说明坡度是影响细沟发育的主要因素，...
GIS-based assessment of land suitability for alfalfa cultivation: a case study in the dry continental steppes of northern China
land suitability GIS MCDA Fuzzy analysis AHP Medicago sativa dry continental steppes
2014/10/24
Alfalfa (Medicago sativa L.) is the most valuable perennial forage grass in northern China. We selected 12 ecological criteria and 4 socioeconomic criteria to calculate the suitability of land for alf...
以亚热带坡地毛竹林地为试验背景,结合室内控制条件下的降解试验,研究咪唑烟酸在土壤中的分布与归趋,以指导咪唑烟酸在类似地区的安全使用。结果表明,实验室条件下,咪唑烟酸在土壤中的微生物降解较缓慢,降解半衰期为77 d,可能是因为纯毛竹林地土壤中可降解咪唑烟酸的微生物较少或活性较低所致。田间条件下,咪唑烟酸残留主要分布在0～20 cm深度土层。当施用前期咪唑烟酸浓度较高时,随降水作用咪唑烟酸淋溶现象明显...