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植物可以通过根系分泌、残茬降解等方式释放酚类化合物到土壤中,从而对自身或其它植物产生直接或间接的影响;但酚类化合物对土壤微生物的影响目前尚不十分清楚。该试验以“津绿3号”黄瓜品种为试材,通过外源添加在黄瓜连作体系中测得浓度的香草醛,研究了其对黄瓜幼苗生长及土壤微生物的影响。结果表明:外源香草醛影响了黄瓜幼苗生长及土壤微生物活性;在培养皿中,0.25~1.00mmol/L香草醛溶液处理显著抑制了黄瓜种子胚根伸长(P<0.05);在土壤条件下,0.05~0.20μmol/g土香草醛处理显著抑制了黄瓜幼苗株高及叶面积(P<0.05);同时,所有浓度的香草醛处理(0.02~0.20μmol/g土)均显著提高了土壤脱氢酶活性和土壤微生物生物量碳含量(P<0.05);总之,外源香草醛能同时抑制黄瓜幼苗生长并促进土壤微生物活性。
Plants can release phenolic compounds into the soil through root excretion and stubble degradation, which will directly or indirectly affect themselves or other plants. However, the influence of phenolic compounds on soil microorganisms is not yet clear. In this experiment, “Jinlu No.3” cucumber cultivars were used as materials to measure the concentration of vanillin in cucumber continuous cropping system by adding exogenous sources, and the effects on Cucumber seedling growth and soil microorganism were studied. The results showed that exogenous vanillin affected cucumber seedling growth and soil microbial activity. In petri dish, 0.25-1.00 mmol / L vanillin solution significantly inhibited the elongation of cucumber seedling roots (P <0.05) (P <0.05). At the same time, all concentrations of vanillin treatment (0.02 ~ 0.20μmol / g soil) significantly increased soil Dehydrogenase activity and soil microbial biomass carbon content (P <0.05). In conclusion, exogenous vanillin can inhibit the growth of cucumber seedlings and promote soil microbial activity.