贵州省赤水市耕(园)地土壤质量地球化学评价

Geochemical Evaluation on Soil Quality of Cultivated(Garden)Land in Chishui City,Guizhou Province

根据1∶50000耕地质量地球化学调查,对研究区环境和养分进行分级并评价,在环境和养分等级评价基础上,对土壤质量进行综合评价。结果表明,研究区土壤环境总体偏酸性;土壤环境质量优良,无重金属超标现象。除镉外,其余7种元素超过99.8%的土壤属于Ⅰ类优先保护类。养分含量整体较缺乏,除有效锌、氮元素外,其余11种养分元素均以较缺乏-缺乏等级为主,其中有效磷、硼、锰最为缺乏,缺乏等级比例均超过61%;土壤质量以中等等级为主,占总面积76.81%。上述研究结果说明,赤水市土壤呈酸性,环境质量优良,养分含量低,应增施草木灰、禽畜、粪便等有机肥,增加土壤肥力,提高农产品质量,发展绿色农业。

According to the 1∶50000 cultivated land quality geochemical survey, the environment and nutrients of the study area are graded and evaluated. Based on the environment and nutrient grade evaluation,the soil quality is comprehensively evaluated. The results show that:(a) the soil environment is generally acidic in the study area.(b) The soil is free of heavy metals and the environmental quality is excellent. Except for cadmium,the remaining 7 elements with more than 99.8% of the soil belong to ClassⅠ(priority protection category).(c) The nutrient content is relatively lacking. Except for effective zinc and nitrogen,the remaining 12 nutrients are mainly lacking-lacking grades. Among them,available phosphorus,boron,and manganese are most scarce,and the proportion of lacking grades exceeds 61%.(d) The soil quality is mainly medium grade,accounting for 76.81% of the total area. The above research results indicate that the soil is acidic,the environment is of good quality,and the nutrient content is low. Organic fertilizers such as grass ash,livestock,and manure should be added to increase soil fertility,improve the quality of agricultural products,and develop green agriculture.