نتایج جستجو برای: loess soils
تعداد نتایج: 52082 فیلتر نتایج به سال:
Evapotranspiration (ET) plays a significant role in regional and global climates through its partitioning in hydrological cycles, and its estimation is thus of a great importance in assessing ground water and surface water resources, predicting crop yield and planning land use. For experimenting the possibility to assess the hydrological responses of ecological restoration in the Western Chines...
The red-clay sequence on the Chinese Loess Plateau (CLP) was deposited during the late Miocene-Pliocene and is encoded with important information of past climate changes. However, it has received much less study in comparison to the overlying Pleistocene loess-paleosol sequence. In this paper, we review recent progress in characterizing the environmental magnetic parameter-based paleoclimate hi...
With a vast area of marginal land, the Loess Plateau of China is a promising region for large-scale production of second-generation energy crops. However, it remains unknown whether such production is sustainable in the long run, especially under climate change. Using a regional climate change model, PRECIS, we analyzed the impact of climate change on Miscanthus production in the Loess Plateau....
The use of cover crops (CC) during the agricultural fallow period has been shown to help alleviate soil compaction and provide stabilizing effects against erosion. These benefits are particularly important as many silty, loess-derived soils major land resource area (MLRA) 134, Southern Mississippi Valley Loess, have large erosion potentials. This study evaluated CC no-cover crop (NCC) treatment...
Both osmotic and matric suction changes have a significant influence on the mechanical behaviour of clays. Despite different types interactions at microstructural level, both suctions havea relevant effect fabric non-expansive Starting from experimental observations laboratory scale, it is possible to identify some common features characterizing response clays salinity degree saturation changes...
Retardation of tritium migration in the Chinese loess media was studied through column experiments by comparison of the migration velocity with other three “non-adsorptive” tracers of Br, Tc, and I. Results showed that the transport peak of Br was 1.25 times earlier than that of tritium when the tracers were simultaneously injected into the column, and the migration of Tc was even 1.60 times fa...
Predicting the probability of the occurrence of a binary outcome or condition is important in biomedical research. While assessing discrimination is an essential issue in developing and validating binary prediction models, less attention has been paid to methods for assessing model calibration. Calibration refers to the degree of agreement between observed and predicted probabilities and is oft...
We present an analysis of the impacts of weather change and large-scale vegetation conservation programs on the vegetation dynamics in China’s Loess Plateau from 2000 through 2009. We employed a multiple lines of evidence approach in which multi-scale data were used. We employed Normalized Difference Vegetation Index (NDVI) data, acquired by the Moderate Resolution Imaging Spectroradiometer (MO...
BACKGROUND Adequate normalization minimizes the effects of systematic technical variations and is a prerequisite for getting meaningful biological changes. However, there is inconsistency about miRNA normalization performances and recommendations. Thus, we investigated the impact of seven different normalization methods (reference gene index, global geometric mean, quantile, invariant selection...
A 45 m outcrop of Quaternary sediments on Birch Creek, near Circle, Alaska, reveals a record of #uctuating environmental conditions that probably spans several glacial}interglacial cycles. From base to top the deposits are forested #oodplain (warm), colluvium with ice wedges (cold), forest soil (warm), loess (cold), paleosol containing Old Crow Tephra (OCt) (cool-to-warm), loess (cold), lacustr...
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