【摘要】 研究5·12汶川地震后土壤Cu、Zn空间分布特征及影响因素,其结果对指导灾后农业生产和居民生活恢复,以及保障新型农村居民点的生态安全性具有十分重要的现实意义。以典型地震灾区彭州市新黄村为例,采用常规重金属测定方法,并用GIS研究了5·12汶川地震后土壤Cu、Zn空间分布特征及影响因素。结果表明,在水平方向上Cu含量([38.23±15.21)mg·kg-1]自中东部-北部和中东部-南部逐渐增加;Zn含量([109.01±29.68)mg·kg-1]从北到南先减少后增加,从东到西表现为先增加后减少;虽然两者均未超过国家土壤环境质量二级标准,但地震后帐篷安置点、生活垃圾堆放点、房屋倒塌点土壤Cu、Zn含量明显高于未受地震影响处;在垂直方向上,帐篷压实水田土壤耕作层和犁底层Cu、Zn含量大多高于自然水田,心土层和底土层二者含量差异不明显。影响因素分析结果表明,不同土地利用类型中水田和荒地土壤Cu含量显著高于旱地土壤,水田土壤Zn含量显著高于荒地和旱地土壤;有机质含量与Cu、Zn含量呈极显著正相关,相关系数分别为r=0.639**和r=0.561**;Cu含量与pH呈显著正相关(r=0.459*),Zn含量与pH相关性不强(r=0.380);人类活动对土壤中Cu、Zn含量有一定影响。更多还原

【Abstract】 There is great practical significance that study of soil Cu,Zn spatial distribution characteristics and influencing factors after 5·12 Wenchuan earthquake,Because the results can be to guide recovery of agricultural production and living after disaster,as well as to protect the ecological safety of new rural settlements.The paper studied the distributed characteristics and influencing factors of Cu,Zn in the soil in a typical earthquake-stricken area named new Huangcun Pengzhou City.The results showed that:Cu contents(38.23 ± 15.21)mg·kg-1 took a gradual increase from the middle east to the north and the middle east to the south in the horizontal direction;Zn contents(109.01 ± 29.68) mg·kg-1 reduced at first and then increased from north to south,while conducted differently from east to west.Both Cu and Zn did not exceed the soil environmental quality second-level standards.However,Cu,Zn contents in the soil under tent settlements after the earthquake,living garbage dumps and the housing collapse were significantly higher than the soil where were not affected by the earthquake.In the vertical direction,Cu,Zn contents in paddy field under tents were mostly higher than the natural paddy field on plow layer and plow pan layer,but other two layers had not obvious differences between the two fields.The influencing factors indicated that:Cu contents of paddy fields and wasteland were significantly higher than that of dry land in the different soil types,and Zn contents of paddy soil were significantly higher than the wasteland and dry land;The correlation coefficients of organic matter contents and the Cu,Zn contents were r=0.639 and r=0.561,which took a highly significant positive correlation;Cu contents and pH took a significant positive correlation(r= 0.459 ),and the correlation coefficient of Zn contents and pH was 0.380;The human activities had a certain impact on Cu,Zn contents in the studied area.更多还原