沂蒙山区土壤质量地球化学评价方法

为建立山东省临沂市沂蒙山区特殊地质背景土壤质量评价方法，在沂南县西南部研究区采集各类土壤样品1 029件，均分析了N、P、K、Mn、B、Mo、Cu、Zn、Co、V、Ni、Sr、Tl、Ti、As、Cd、Hg、Pb、Cr、Se、F、I、Ge、有机质、Na₂O、SiO₂、MgO、CaO质量分数及pH等29项指标。根据分析测试结果，建立了由土壤养分指标和环境指标组成的评价体系，并对该区土壤质量地球化学评价及其空间分布进行了研究。结果表明：研究区大部分土壤质量以良好、中等为主（土壤环境清洁，土壤养分丰富或中等）；研究区中部地区土壤肥力较好（w（N）>0.10%，w（P）>0.06%，w（K）>2.50%），西南部、东北部山区土壤肥力较差（w（N）<0.075%），土壤质量等级偏低。全区80%左右土壤的N元素、B元素、有机质均不足以满足常规农业生产需要，对常规作物生长不利。区内土壤环境质量水平总体较好，重金属元素分布受地质背景控制。

Geochemical Evaluation Method of Soil Quality in Yimeng Mountain Area

In order to establish an soil quality evaluation method with special geological background in Yimeng Mountain area of Linyi City, Shandong Province, a total of 1 029 soil samples were collected in the southwest of Yinan County, and 29 indexes of N, P, K, B, Mn, Mo, Se, I, Ge, F, Zn, Cu, Co, V, As, Cr, Cd, Hg, Pb, Ni, organic matter, pH, Sr, Na, Ca, Si, Mg, Tl, Ti were analyzed. Based on the analysis and test results, the evaluation system composed of soil nutrient index and environmental index was established. The geochemical evaluation and research of spatial distribution of soil quality in this area were conducted. The results showed that most of the soil quality in the whole area are good and medium (the soil environment is clean, the soil nutrient is rich or medium), the soil fertility in the middle of the study area is good (w(N)>0.10%,w(P)>0.06%,w(K)>2.50%), the fertility in the mountainous areas in the southwest and northeast of the study area is poor (w(N)<0.075%), thus the overall soil quality grade is low. The content of N, B and organic matter in about 80% of the soil of the whole region is not enough to meet the needs of conventional agricultural production. However,the soil environmental quality level in the area is generally good, and the distribution of heavy metals is controlled by the geological background.