搜索结果: 136-150 共查到“知识库 土壤生态学”相关记录1076条 . 查询时间(1.171 秒)
基于Radarsat-2全极化数据的张掖地区土壤水分的反演
土壤水分 Radarsat-2 经验模型 AIEM
2019/4/18
土壤水分是水文、农业、生态等众多研究领域中的重要参数。基于已建立的简化土壤水分反演模型，结合全极化雷达数据的特征，消除简化模型中的粗糙度参数，以提高反演的精度。通过简化经验模型分析，结果显示VV/HH、VV/VH和HH/HV极化组合均能够较好地模拟裸土区土壤水分，其中VV/VH极化组合模拟结果最好。利用Radarsat-2数据反演黑河中游裸土区和植被区的土壤水分，并利用实测数据对结果进行验证。结果...
农牧交错带农田土壤风蚀PM10释放特征
农牧交错带 农田 风蚀 PM10释放
2018/4/18
粉尘释放是风蚀造成危害的一个重要过程。以农牧交错带沙区和非沙区农田土壤为研究对象，利用室内风洞模拟实验，实时监测了风蚀过程中释放的PM10，分析了PM10的动态变化特征，以深入认识土壤风蚀粉尘释放机理。结果表明：非沙区农田土壤风蚀强度远低于沙区农田，与风速呈指数函数关系；非沙区农田的土壤粉尘释放在不同风速下均以气流直接抬升模式为主，平均PM10通量与风速呈线性函数关系，最大PM10通量与风速呈幂函...
国际土壤科学联合会公告122（IUSS Bulletin 122）。
定量揭示土壤水分与有机质对高光谱的作用规律，为提高土壤水分、有机质的光谱估测精度提供基础。【方法】以山东省泰安市岱岳区90个棕壤土样为研究对象，进行室外光谱采集、室内土壤水分和有机质测定，运用Savitzky-Golay filter对光谱曲线进行平滑去噪预处理。根据含水量、有机质含量的高低将土壤样本分为9组，运用比较法对9组原始光谱数据进行分析，初步探究土壤水、有机质对光谱的作用规律。然后采用相...
国际土壤科学联合会公告112（IUSS Bulletin 112）。
国际土壤科学联合会公告107（IUSS Bulletin 107）。
国际土壤科学联合会公告13（IUSS Bulletin 13）。
Spatial differentiation of ecosystem risks of soil pollution in floodplain areas of the Czech Republic
floods persistent organic pollutants soil contamination spatial patterns trace elements
2017/4/6
Extensive soil sampling and screening assessment of ecosystem risks combined with a multidimensional statistical analysis were used to estimate and spatially characterize the ecosystem risks stemming ...
Impact of animal manure addition on the weathering of agricultural lime in acidic soils: The agent of carbonate weathering
Carbonate weathering Soil/atmospheric CO2 CO2 source/sink
2018/3/23
Fertilization and aglime (agricultural lime) application, as important agricultural activities in acid soil, exert an influence on the fluxes of carbon both between and within ecosystems. Animal manur...
Scale effects of eroded sediment transport in Wujiang River Basin, Guizhou Province, China
Sediment transport modulus Scale effect Soil erosion Wujiang River Basin
2018/3/23
In recent years, research on spatial scale and scale transformation of eroded sediment transport has become a forefront field in current soil erosion research, but there are very few studies on the sc...
Risk assessment of heavy metals in topsoil along the banks of theYangtze River in Huangshi, China
Heavy metals Risk assessment Soil chemical analysis The Yangtze River Huangshi
2018/3/23
High concentrations of heavy metal in farmland threatens food production and human health. Our study assesses soil quality and the distribution of Cd, Cr, Cu, Zn, Pb and Ni, to identify possible sourc...
Research on the effect of straw mulching on the soil moisture by field experiment in the piedmont plain of the Taihang Mountains
Straw mulching Soil moisture Soil water content Deep layer Soil moisture conservation
2018/3/23
To reveal the influencing effect of the long-term straw mulching on the soil moisture, this paper employed the field experiment data in 2010 of a typical area of Taihang Mountains plain, observed the ...
Evaluating the effect of biological stabilization on landslide control at the edge of forest road
sliding area stabilized area alder trees soil mechanics benchmarking
2018/3/6
Landslide is one of the negative sides of building non-standard roads in forest areas. The aim of the present study
was to assess the effect of biological stabilization on landslide at the edge of fo...
Comparison of different erosion control techniques in the Hyrcanian forest in northern Iran
best management practices runoff skid trail soil loss water bar
2018/3/6
The aim of this study was to evaluate the effects of closure best management practices (BMPs) on runoff volume and
soil loss on skid trails that received two densities of soil cover mats and were loc...