铅胁迫下添加硫对小花南芥土壤微生物数量及植株铅累积特性的影响  

Effect of Sulfur Addition on Soil Microbial Quantity and Lead Accumulation Characteristics of Arabis alpina L Plant under Lead Stress

作　　者：李青[1] 赵秋利[1] 郭佩 王吉秀 LI Qing;ZHAO Qiuli;GUO Pei;WANG Jixiu(Yangling Vocational and Technical College,Yangling,Shaanxi 712100,China;Radio and Television Metrology and Inspection(xi'an)Co.,Ltd,Xi'an,Shaanxi 710100,China;Yunan Agricultural University,Kunming,Yunnan 650100,China)

机构地区：[1]杨凌职业技术学院,陕西杨凌712100 [2]广电计量监测(西安)股份有限公司,陕西西安710100 [3]云南农业大学,云南昆明650100

出　　处：《陕西农业科学》2022年第8期35-40,共6页Shaanxi Journal of Agricultural Sciences

基　　金：杨凌职业技术学院自然科学基金(批准号:ZK20-71)资助的课题。

摘　　要：为探明在铅胁迫下,外源添加不同硫浓度是否会影响小花南芥(Arabis alpina L. var.parviflora Franch)土壤微生物数量及植株铅累积特性,采用盆栽试验种植野生小花南芥,通过测定土壤pH、S、Pb含量,土壤微生物数量以及植株铅含量,揭示铅胁迫下,外源添加不同硫浓度对超富集植物小花南芥土壤微生物数量及植株铅累积特性的影响。结果表明:铅胁迫下,外源添加不同硫浓度(1)使土壤pH从6.87下降到6.17;(2)对土壤Pb含量有极显著影响,土壤铅含量可达2 100.22 mg/kg;(3)对细菌、真菌、放线菌无显著影响;(4)显著增加了地上部和地下部对铅的吸收,其中,地上部铅含量可达2 524.01 mg/kg,地下部铅含量可达1 672.94 mg/kg,富集系数、转运系数和转运量系数最高分别可达4.04、1.73和9.84。研究发现,铅胁迫下,外源添加不同硫浓度可促进小花南芥对铅的吸收,土壤中微生物的数量也发生变化。In order to clarify the effect of addition of different concentrations of sulfur under lead stress on the quantity of soil microorganisms and lead accumulation characteristics of Arabis alpina L, a pot experiment was conducted to grow wild Arabis alpina L. The content of soil pH, S, Pb, the number of soil microorganisms and the content of lead in plants revealed the effects of different concentrations of sulfur on the soil microbial number and the characteristics of lead accumulation in the hyperaccumulator plant under lead stress. The results showed that under lead stress,(1)the soil pH reduced from 6.87 to 6.17;(2)there was a very significant effect on the soil Pb content, and the soil lead content could reach 2 100.22 mg/kg;(3)the bacteria, fungi, and actinomycetes had no significant effect;(4)the absorption of lead in above ground and underground parts significantly increased. Among them, the lead content in the ground part could reach 2 524.01 mg/kg, and the lead content in the underground part could reach 1 672.94 mg/kg, the highest enrichment coefficient, transport coefficient and transport volume coefficient could reach 4.04, 1.73 and 9.84, respectively. Under lead stress, the addition of different concentrations of sulfur from external sources could promote the absorption of lead by Arabis alpina L, and the number of microorganisms in the soil also changed.

关 键 词：硫 铅 小花南芥 土壤微生物 

分 类 号：S154[农业科学—土壤学]