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中文摘要：
选取陕北延安地区原油和黄绵土，设计了完全混合和表面施油两种处理方式，通过盆栽试验，研究了不同浓度石油污染处理对植物生长和土壤呼吸的影响。结果表明，玉米和紫花苜蓿在完全混合的油污土壤上萌发良好，但生长受阻，而表面喷洒处理的石油污染严重影响紫花苜蓿的萌发和生长；土壤呼吸作用对石油污染十分敏感，完全混合处理土壤呼吸与石油污染比例成正相关关系，污染越重，土壤呼吸强度越大，所有污染处理1周后土壤呼吸强度出现抑制而迅速回落，并在波动中逐渐趋于稳定，但仍然显著高于对照组，表明黄土中存在对石油耐受的土著微生物群落。
英文摘要：
Crude oil and loess soil from north Shaanxi Province were selected to study effects of oil on growth of plant seedling and soil respiration in this pot experimental. Two kinds of oil treatment, the spilled oil-polluted soil （SOPS） and the mixed oil-polluted soil （MOPS）, were designed with different oil contamination levels. Result showed that SOPS treatments had no effect on germination of maize （Zea mays L. ）and alfalfa （Medicago sativa L. ） but adversely affected growth of the two plants; Both germination and growth of alfalfa were affected severe ly in the MOPS treatments. Soil respiration was sensitive to oil pollution, and increased with oil pollution rates. Although inhibition of oil contamination and some fluctuation since one week after oil treatment, soil respiration of all oil treated soils gradually went stable and had been significantly （p = 0.05） greater than the control by the end of the experimental. The results indicated there were tolerant microbial species in loess soil.
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