不同暖季型草坪草品种对盐碱地土壤理化性质和微生物群落的影响

Effects of different warm-season turfgrass cultivars on soil physicochemical property and microbial community of saline-alkali land

在江苏盐碱地中种植暖季型草坪草狗牙根〔Cynodon dactylon(Linn.)Pers.〕品种‘阳江’(‘Yangjiang’)和杂交结缕草(Zoysia sinica×Z.matrella)品种‘苏植3号’(‘Suzhi No.3’),探索这2个品种对盐碱地的植株地下部生物量以及土壤理化性质和微生物群落的影响。结果表明:‘阳江’和‘苏植3号’种植样地的植株地下部生物量和土壤有机质含量均显著高于对照样地;土壤的pH值和电导率均显著低于对照样地。细菌群落结构和真菌群落结构与对照样地均有显著差异,‘阳江’和‘苏植3号’种植样地的细菌Shannon-Wiener多样性指数均显著高于对照样地;固氮细菌、丛枝菌根真菌和粪腐生真菌的相对丰富度均显著高于对照样地。总体上看,‘阳江’和‘苏植3号’种植样地土壤中功能细菌类群关系较近,二者与对照样地的关系均较远;而3种样地土壤中功能真菌类群关系均较远。‘阳江’和‘苏植3号’种植样地的植株地下部生物量和土壤理化性质明显影响土壤中细菌多样性,植株地下部生物量以及土壤的pH值和电导率明显影响土壤中部分功能细菌的丰富度,植株地下部生物量和土壤pH值明显影响土壤中部分功能真菌的丰富度。综合分析认为,在江苏滨海盐碱地中种植‘阳江’和‘苏植3号’对盐碱地的植株地下部生物量以及土壤理化性质和微生物群落有明显的积极影响,在盐碱地生态修复中具有重要作用。

Warm-season turfgrass namely cultivar‘Yangjiang’of Cynodon dactylon(Linn.)Pers.and cultivar‘Suzhi No.3’of Zoysia sinica×Z.matrella were planted in saline-alkali land in Jiangsu,and the effects of these two cultivars on under-ground biomass of plant and soil physicochemical property and microbial community of soil of saline-alkali land were explored.The results show that under-ground biomass of plant and organic matter content in soil of plots planted with‘Yangjiang’and‘Suzhi No.3’are both significantly higher than those of the control plot;soil pH value and electric conductivity are both significantly lower than those of the control plot.There are significant differences in both bacterial community structure and fungal community structure compared with the control plot,and the Shannon-Wiener diversity index of bacteria in plots planted with‘Yangjiang’and‘Suzhi No.3’are both significantly higher than that of the control plot;relative abundance of nitrogen fixation bacteria,arbuscular mycorrhizal fungi,and dung saprotroph fungi are all significantly higher than those of the control plot.In general,the relationships of functional bacterial groups in soil between plots planted with‘Yangjiang’and‘Suzhi No.3’are relatively close,and the relationships between them and the control plot are both relatively far;while the relationships of functional fungal groups in soil among three kinds of plots are all relatively far.The soil bacterial diversity in plots planted with‘Yangjiang’and‘Suzhi No.3’are obviously affected by under-ground biomass of plant and soil physicochemical property,the abundance of some functional bacteria in soil are obviously affected by under-ground biomass of plant and soil pH value and electric conductivity,the abundance of some functional fungi in soil are obviously affected by under-ground biomass of plant and soil pH value.The comprehensive analysis indicates that planting‘Yangjiang’and‘Suzhi No.3’in coastal saline-alkali land in Jiangsu has an evident positive impact on under-ground biomass of plant and physicochemical property and microbial community of soil of saline-alkali land,and has an important role in ecological remediation of saline-alkali land.