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171.
Thirty-five new microsatellite loci from the sea cucumbers H olothurian scabra(Jaeger, 1833) and Apostichopus japonicas(Selenka, 1867) were screened and characterized using the method of magnetic bead enrichment. Of the twenty-four polymorphic loci tested, eighteen were consistent with Hardy-Weinberg equilibrium after a modified false discovery rate(B-Y FDR) correction, whereas six showed statistically significant deviations(CHS2 and CHS11: P 0.014 790; FCS1, FCS6, FCS8 and FCS14: P 0.015 377). Furthermore, four species of plesiomorphous and related sea cucumbers(Holothurian scabra, Holothuria leucospilota, Stichopus horrens and Apostichopus japonicas) were tested for mutual cross-amplification using a total of ninety microsatellite loci. Although transferability and universality of all loci were generally low, the results of the cross-species study showed that the markers can be applied to identify individuals to species according to the presence or absence of specific microsatellite alleles. The microsatellite markers reported here will contribute to the study of genetic diversity, assisted breeding, and population conservation in sea cucumbers, as well as allow for the identification of individuals to closely related species. 相似文献
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Tillage pedogenesis of purple soils in southwestern China 总被引:5,自引:2,他引:3
HE Xiubin* BAO Yuhai NAN Hongwei XIONG Donghong WANG Li LIUYanfeng ZHAO Jingbo Institute of Mountain Hazards Environment Chinese Academy of Sciences Chengdu China Graduate School of the Chinese Academy of Sciences Beijing China Shaanxi Normal University Xi’an China 《山地科学学报》2009,6(2):205-210
Land cultivation and tillage process, and their consequent impacts on soil erosion, have been criticized as the main cause of degradation of land or soil quality. However, purple soils, classified as Regosols in FAO Taxonomy or Entisols in USDA Taxonomy, are formed from purple rocks of the Trias- Cretaceous system, have been developed or at least accelerated the development due to continual tillage operation, especially digging and ridging. The present study took micromorphological investigation on the sedimentary rocks and the soils under different operations of tillage. Results show that the purple rock of Feixiangguan Formation of the Trias system (Tlf) is the easiest to physical weathering and the most fertile soil material enriched in nutrients, and it has been, therefore, mostly cultivated and intensively tilled around the year. It has the fastest soil formation rate. Soil formation rate in the cropland with conventional tillage is higher than that in the forestiand and the grassland. It implies that the artificial brokenness and tillage disturbance play a great role in physical weathering and initiating soil formation processes. 相似文献
174.
Estimation of suspended sediment concentrations using Pulse-coherent Acoustic Doppler Profiler (PCADP) 总被引:3,自引:0,他引:3
The objective of the study is to investigate the suitability of using Pulse-coherent Acoustic Doppler Profiler (PCADP) to
estimate suspended sediment concentration (SSC). The acoustic backscatter intensity was corrected for spreading and absorption
loss, then calibrated with OBS and finally converted to SSC. The results show that there is a good correlation between SSC
and backscatter intensity with R value of 0.74. The mean relative error is 22.4%. Then the time span of little particle size
variation was also analyzed to exclude the influence of size variation. The correlation coefficient increased to 0.81 and
the error decreased to 18.9%. Our results suggest that the PCADP can meet the requirement of other professional instruments
to estimate SSC with the errors between 20% and 50%, and can satisfy the need of dynamics study of suspended particles.
Supported by National High Technology Research and Development Program of China (863 Program, No. 2008AA09Z113) 相似文献
175.
全新世高温期气候不稳定性记录 总被引:13,自引:0,他引:13
对黄土高原黄土剖面中的黑垆进行了植物孢粉植物硅酸体,碳同位素和化学分析测试,结果表明,黑垆土良好地记录了全新世高温期气候不稳定性,在大致9-6kaB.P.期间,曾发生数次强度不等的快速变化。 相似文献
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为了研究泉水化学成分特点和在一年内的变化,文章利用pH-电导率自动记录仪对陕西秦岭翠华山地区两处泉水化学成分进行了每月2次的观测,并进行了水化学分析。翠华山泉水中HCO-3含量在76.27~152.55mg/L之间,Ca2+含量在14.48~26.92mg/L之间,Mg2+含量在4.46~4.89mg/L之间,K+含量在0.60~2.75mg/L之间,Na+含量在0.93~1.09mg/L之间,这些成分的特点是含量低。泉水pH值在6.98~5.69之间,夏秋季低于该区雨水的pH值,具酸性特征,这是该区地层主要由片麻岩构成决定的。从1月到11月,水秋池村泉水pH值和电导率呈现由大到小再到大的变化规律,引起这种变化的主要原因是夏秋季土壤CO2含量比冬春季高,泉水在夏秋季流动过程中吸收了较多的CO2。翠华湖西泉水pH值和Ca2+,Mg2+,K+,Na+离子含量比水秋池泉水高,从1月到11月Ca2+,Mg2+,K+,Na+离子含量变化与水秋池泉水变化相反,这应当是两个泉水的来源不同或在流动过程中遇到了酸碱性不同的土层和地层造成的。翠华山地区泉水化学成分变化是易于观测到的规律性很强的变化。 相似文献
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180.