L. I. Liu

This study used a flame atomic absorption spectrometer (FAAS) and atomic fluorescence spec-trophotometer (AFS) to detect the concentrations of chromium (Cr), cadmium (Cd), lead (Pb), hy-drargyrum (Hg) and arsenic (As) in soils and three genotypes of vegetables in greenhouse, as well as analyzed the physical and chemical properties of soils, including soil pH, soil organic matter (OM), basic nutrients, electrical conductivity (EC) and cation exchange capacity (CEC) in Guan- zhong areas, Shaanxi province, China. The results showed that comparing to subsoil, the sampled topsoil is enriched in Cr, Cd, Pb, As and Hg. Cd (0.83 - 3.17 mg·kg-1) and Hg (0.40 - 1.44 mg·kg-1) are exceeding the limited value stated in “the 2006 Greenhouse Vegetable Producing Environmental Quality Evaluation Standards” of 0.40 mg·kg-1 and 0.35 mg·kg-1 respectively. However, Nanzhuang greenhouse soil is within the limits. The heavy metal pollution index (HPI) of soil in Sanyuan (8.10) is the highest and in Dongzhang (4.23) is the lowest. The contents of Pb (0.201 - 0.376 mg·kg-1) were exceeding the limited value (0.20 mg·kg-1) in vegetables species, and Cd (0.0363 - 0.0572 mg·kg-1) in some place were also exceeding the limited value (0.05 mg·kg-1). Greenhouse soils were becoming acidified year after year; the ratios of N, P and K in soil were seriously imbalanced. According to the impacting factors, OM, pH, available P, EC and CEC have obviously effected the accumulation of Cr and Hg. However, there was not enough evidence for the effects of available nitrogen and available potassium.

Fishburn and Vickson showed that, when applied to random alternatives with an equal mean, 3rd-degree and decreasing absolute risk aversion stochastic dominances represent equivalent rules. The present paper generalizes this result to higher degrees. Specifically, higher-degree stochastic dominance rules and common preference by all decision makers with decreasing higher-order absolute risk aversion are shown to coincide under appropriate constraints on the respective moments of the random variables to be compared.

Marxist value standpoint taking the value of working classes as more important and higher than universal human value has already been proved wrong by the antihuman practice led by the standpoint in the 20th century. Though the disastrous historical reality was definitely beyond or not the expectation of Marxism founders, the practice is logically necessary result of the unavoidable historical limitation and theory mistake of Marxism. In their early years, both Karl Marx and Friedrich Engels held the criterion of the universal human value such as freedom, democracy, equality and fraternity. However, decided or required by the spacetime concrete circumstance, they had to concretize the ideal of ‘human liberation’ into the aim of ‘the liberation of proletariat’. According to such the three principles: social existence decides social consciousness, there is no common human nature in a society in which people belong to the different classes, and productive forces is the final motive power and cause of social development, historical materialism demonstrates the supreme position of the value of working classes. These arguments are not persuasive in theory. Marxism itself has to take the universal human value as moral criterion against capitalism. Historical materialism has the problem of inherent reductionism in its epistemic methodology. Also, Marxism commits the obvious simple mistake to negate generality with specialty in expounding no common human nature existing in a class society. And The Marxism founders were rational arrogance when building their theory system. These are epistemology and psychology factors to form the prejudiced value standpoint. This reflection on the mistake of Marxist value standpoint expects to reach such a common consensus: to accept consciously and further improve and perfect the universal human values that mark the maturity level of today’s human spirit as human’s qualification.