Li W.,Chinese Academy of Forestry |
Feng W.,Chinese Academy of Forestry |
Feng W.,Xilingol Vocational College |
Yang W.,Chinese Academy of Forestry |
And 3 more authors.
Shuikexue Jinzhan/Advances in Water Science | Year: 2015
In order to analyze the relationship between deep layer moisture infiltration and rainfall in mobile dunes, using YWB-01 deep layer moisture infiltration recorder and soil water dynamics theory, this study explains the rainfall infiltration moisture transfer process in Mu Us Sandy Land mobile dunes, as well as the infiltration recharge characteristics at the soil layer of 150cm deep. The results showed that: the major source of deep layer soil moisture in mobile dunes was rainfall infiltration. The infiltration recharge amount was 141.4 mm for 2010 and 355.8 mm for 2011, counting for 55.1% and 68.2% of the total rainfall amount of that year. The major recharging season of deep layer infiltration lasted from May to November, and the recharge amount during these months counted for 95% of the total annual amount. When the soil moisture condition remained within the field moisture capacity, rainfall's recharging effect on 150 cm deep soil layer was mainly influenced by rainfall amount and density, with a significant positive correlation (P<0.01) between infiltration and rainfall amount. Water usually infiltrated into the 150 cm deep soil layer at 30 to 48 hours after the start of rainfall. The infiltration recharging rate increased rapidly in the first 3 to 5 hours, reaching its maximum at 3 to 8 hours, before decreasing slowly afterwards. The entire infiltration recharging process could last for longer than 96 hours. © 2015, Science Press. All right reserved.
Dong S.,Inner Mongolia University |
Liu B.,Wuhan University |
Liu H.,Inner Mongolia University |
Wang S.,Xilingol Vocational College |
Wang L.,Inner Mongolia University
Scientific World Journal | Year: 2014
In the rubber dam's impact area, the groundwater total hardness (TH) has declined since 2000, ultimately dropping to 100-300 mg/L in 2012. pH levels have shown no obvious changes. NH4-N concentration in the groundwater remained stable from 2000 to 2006, but it increased from 2007 to 2012, with the largest increase up to 0.2 mg/L. NO3-N concentration in the groundwater generally declined in 2000-2006 and then increased from 2007; the largest increase was to 10 mg/L in 2012. Total dissolved solids (TDS) of the groundwater showed a general trend of decline from 2000 to 2009, but levels increased after 2010, especially along the south bank of the Luohe River where the largest increase recorded was approximately 100 mg/L. This study has shown that the increases in the concentrations of NH4-N and NO3-N were probably caused by changes in groundwater levels. Nitrates adsorbed by the silt clay of aeration zone appear to have entered the groundwater through physical and chemical reactions. TDS increased because of groundwater evaporation and some soluble ions entered the groundwater in the unsaturated zone. The distance of the contaminant to the surface of the aquifer became shorter due to the shallow depth of groundwater, resulting in the observed rise in pollutant concentrations more pronounced. © 2014 Shaogang Dong et al.
Hu J.,Xilingol Vocational College |
Zou Z.,Xilinhot New Source Science and Technology Development Co. |
Xu S.,Chinese Academy of Agricultural Sciences
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2013
In order to improve the high lift and small flow wind power water pumping machine series in the north of China, adapt to different well depth and water carry conditions, the comparative analysis for several types of structure performance were done and the main parameter of wind power water pumping machine product were developed. Combined with popularization and application practice of pastoral areas for many years, with the new development of FSH-400 type of high performance wind power water pumping machine as an example, do the performance text for V-n characteristics, safety operation, the automatic protection, speed control and direction adjustment. Test showed that this type of wind pumping water equipment's rotor uses segment variable torsion angle and streamline blade, optimize the overall performance of the wind pumping water machine. It's energy conversion rate is high, fit well, low cost, unattended operation, simple and reliable operation. In addition to meet people and livestock drinking need, combined with micro drip irrigation technology, it can be used for pasture, feed irrigation, urban and rural road landscape greening, seeding cultivation, etc.
Sangjiezhabu,Xilingol Vocational College |
Sangjiezhabu,Nanyang Normal University |
Li G.-Q.,Nanyang Normal University
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015
Three-dimensionally LaPO4:Ce3+, Tb3+ inverse opal phosphors (IOPs) were fabricated by the PMMA colloidal template method. The modification of photonic stop band (PSB) on emission spectra and dynamics of Ce3+ and Tb3+ was studied. It is significant to observe that in the IOPs, as to the unique cavity structure of three-dimensional inverse opal photonic crystals, the spontaneous emission and radiation trapping of photoluminescence are greatly suppressed due to the periodic empty cavity structure of IOPs, which is significant for high-power light source and laser devices. © 2015, Chinese Ceramic Society. All right reserved.
Tian D.,CAS Institute of Botany |
Tian D.,University of Chinese Academy of Sciences |
Pan Q.,CAS Institute of Botany |
Simmons M.,University of Minnesota |
And 5 more authors.
PLoS ONE | Year: 2012
Bunchgrasses are one of the most important plant functional groups in grassland ecosystems. Reproductive allocation (RA) for a bunchgrass is a hierarchical process; however, how bunchgrasses adjust their RAs along hierarchical levels in response to nutrient addition has never been addressed. Here, utilizing an 11-year nutrient addition experiment, we examined the patterns and variations in RA of Agropyron cristatum at the individual, tiller and spike levels. We evaluated the reproductive allometric relationship at each level by type II regression analysis to determine size-dependent and size-independent effects on plant RA variations. Our results indicate that the proportion of reproductive individuals in A. cristatum increased significantly after 11 years of nutrient addition. Adjustments in RA in A. cristatum were mainly occurred at the individual and tiller levels but not at the spike level. A size-dependent effect was a dominant mechanism underlying the changes in plant RA at both individual and tiller levels. Likewise, the distribution of plant size was markedly changed with large individuals increasing after nutrient addition. Tiller-level RA may be a limiting factor for the adjustment of RA in A. cristatum. To the best of our knowledge, this study is the first to examine plant responses in terms of reproductive allocation and allometry to nutrient enrichment within a bunchgrass population from a hierarchical view. Our findings have important implications for understanding the mechanisms underlying bunchgrass responses in RA to future eutrophication due to human activities. In addition, we developed a hierarchical analysis method for disentangling the mechanisms that lead to variation in RA for perennial bunchgrasses. © 2012 Tian et al.