河北省土壤化学元素的背景值与基准值

地球化学背景值和基准值是了解土壤元素地球化学特征的重要参数，而河北省土壤化学元素背景值和基准值的研究程度尚浅.基于此，收集了河北省2004～2018年间的多目标区域地球化学调查和土地质量地球化学调查数据，覆盖范围约占全省陆域面积的71%.以表层和深层土壤数据为基础，利用科学和稳健的中位值-绝对中位差法，计算了河北全省及11个地级市土壤中54项指标Ag、Al₂O₃、As、Au、B、Ba、Be、Bi、Br、CaO、Cd、Ce、Cl、Co、Cr、Cu、F、Fe₂O₃、Ga、Ge、Hg、I、K₂O、La、Li、MgO、Mn、Mo、N、Na₂O、Nb、Ni、P、Pb、pH、Rb、S、Sb、Sc、Se、SiO₂、Sn、Sr、Th、Ti、Tl、U、V、W、Y、Zn、Zr和总碳(TC)、有机碳(C_org)]的背景值、基准值和它们的变化区间，同时还计算了每个指标的自然背景变化率.结果表明，与全国相比，河北省大多数土壤化学元素的背...

Geochemical Background and Baseline Value of Soil Chemical Elements in Hebei Province

Geochemical background and baseline values are important parameters for understanding the geochemical characteristics of soil elements, but the research degree of these two parameters is lacking in Hebei Province. Therefore, data from the multi-purpose regional geochemical survey and land quality geochemical assessment in Hebei Province from 2004 to 2018 were collected, covering approximately 71% of the land area of the whole province. Based on the data of surface soil and deep soil, scientific and robust methods including median value and median absolute deviation were used to calculate the geochemical background values, geochemical baseline values, as well as variation ranges of 54 indexes (Ag, Al₂O₃, As, Au, B, Ba, Be, Bi, Br, CaO, Cd, Ce, Cl, Co, Cr, Cu, F, Fe₂O₃, Ga, Ge, Hg, I, K₂O, La, Li, MgO, Mn, Mo, N, Na₂O, Nb, Ni, P, Pb, pH, Rb, S, Sb, Sc, Se, SiO₂, Sn, Sr, Th, Ti, Tl, U, V, W, Y, Zn, Zr, total carbon (TC), and organic carbon (C_org)) in Hebei Province and 11 prefecture-level cities. The change rate in geochemical background for each index was also calculated. The results showed that the geochemical background and baseline values of most soil chemical elements in Hebei Province were lower than those nationwide, but the values of Ba, Br, Cl, MgO, Na₂O, P, pH, S, Sr, and TC were higher, with CaO being the highest. Compared with those in north China, there was no significant difference in the geochemical background and baseline values for the 54 indexes, with the ratios of 0.83-1.17 and 0.79-1.19, respectively. Significant changes in the geochemical background for C_org, Hg, N, P, S, and Se were observed in Hebei Province, indicating that these indexes were greatly influenced by human factors. Preliminary analysis suggests that coal burning emissions and agricultural chemical use were two very important inducing factors.