作　　者： (王卫华）; (雷龙海）; (杨启良）; (武振中）;

机构地区： 昆明理工大学现代农业工程学院,云南昆明650500

出　　处： 《排灌机械工程学报》 2017年第6期520-525,540,共7页

摘　　要： 为提高小桐子对重金属Pb的耐性及其对污染土壤的修复效率,推荐不影响其正常生长的最佳水铅组合,研究了水铅交互胁迫对小桐子生长及生理特性的影响.试验设计4种灌水水平(T1:100% FC,T2:80% FC,T3:60% FC,T4:40% FC)、4种土壤Pb污染水平(A:0 mg/kg,B:500mg/kg,C:1 000 mg/kg,D:1 500 mg/kg)进行交互试验.结果表明:在水铅交互胁迫下,T2水分胁迫显著提高了小桐子的生物量以及修复效果.水铅交互胁迫下,小桐子叶片SOD、POD酶活性表现为先升后降的趋势,与单一的水分胁迫、铅胁迫相比,交互胁迫提高了SOD、POD活性.水铅交互胁迫下小桐子细胞膜透性总体呈增大趋势,而处理C和D下T2在T1的基础上降低了细胞膜透性.土壤Pb质量比≤500 mg/kg时,小桐子叶水势随水分胁迫加剧逐渐下降,当土壤Pb质量比≥1 000 mg/kg时,小桐子叶水势随着水分胁迫的加剧逐渐增加.适当的交互胁迫有利于提高小桐子的耐Pb胁迫能力以及修复效率,为进一步推进小桐子在土壤铅污染领域的实践与推广提供理论依据. In order to improve the tolerance of Jatropha curcas L. to Pb and its effect on the remediation of contaminated soil and recommend the best water lead combination that does not affect the normal growth, the water lead interaction stress on the influence of growth and physiological characteristics of Jatropha curcas L. was studied. The experiment designed 4 irrigation levels （ T1 ： 100% FC, T2 ： 80% FC, T3：60% FC, T4：40% FC） ,4 soil Pb pollution levels （ A ：0 mg/kg, B ：500 mg/kg, C ： 1 000 rag/ kg, D：1 500 mg/kg）. The results show that lead water interaction under T2 water stress significantly increased the biomass and repaired effect of Jatropha curcas L. Under water lead interaction, the activities of SOD and POD of Jatropha curcas L. were increased first and then decreased. Compared with single water stress and lead stress, SOD and POD activities were increased under the interaction stress. Under the water - lead interaction stress, the cell membrane permeability of Jatropha curcas L. increased, while C and D under the treatment of T2 based on T1 reduced the permeability of cell membrane. Jatropha curcas L. leaf water potential decreased gradually with the increase of water stress when the soil Pb concentration was less than 500 mg/kg, Jatropha curcas L. leaf water potential increased gradually with the increase of water stress, when the soil Pb concentration was more than or equal to 1 000 mg/kg. The appropriate interaction stress can improve the Pb-tolerant stress ability and repair efficiency of Jatropha curcas L.. It provides a theoretical basis for further promoting the practice and promotion in the field of lead contaminated soil of Jatropha curcas L..

关 键 词： 小桐子 叶水势 细胞膜透性