4种草坪草菌根发育状况及其主要土壤影响因子

Mycorrhizal Development Status of Four Turfgrass Plants and Their Main Soil Influence Factors

为明确影响草坪草菌根发育的土壤主控因子,以高羊茅、麦冬、吉祥草、结缕等4种草坪草为材料,研究了4种草坪草根系的丛枝菌根侵染率及其与根系可溶性糖,根际土壤有效磷、有机碳、有机质,根系和土壤球囊霉素含量等的关系。结果表明:4种草坪草菌根侵染率在12.14%~35.25%,且高羊茅>结缕草>麦冬>吉祥草。根系可溶性糖含量以吉祥草最高,为53.58 mg/g,结缕草最低,为21.05 mg/g;土壤有效磷含量以结缕草最高,为10.34 mg/kg,土壤有机碳和有机质含量均以麦冬最高。相关分析表明,草坪草根系菌根侵染率、侵入点与土壤有机碳、有机质、易提取球囊霉素相关土壤蛋白含量呈极显著负相关,与根系难提取球囊霉素含量呈极显著正相关。综上,田间栽培的4种草坪草菌根发育较好,其菌根发育状况主控因子为土壤养分、根系可溶性糖、球囊霉素。

To reveal the main controlling factors affecting the development of turfgrass mycorrhiza,the present study was conducted to analyze the arbuscular mycorrhiza(AM)colonization in roots of four turfgrass plants,including Festuca arundiacea,Ophiopogon japonicus,Reineckea carnea,and Zoysia japonica,and further evaluate the relationship between mycorrhizal infection rate and contents of root soluble sugar,soil available phosphorus,soil organic carbon,organic matter,root and soil glomalin.The results indicated that root mycorrhizal infection rate in four turfgrass plants varied from 12.14%to 35.25%,and the root colonization was ranked as the trend of F.arundiacea>Z.japonica>O.japonicus>R.carnea.Root soluble sugar content was the highest in R.carnea(53.58 mg/g)and the lowest in Z.japonica(21.05 mg/g).Soil available phosphorus level was the highest in Z.japonica(10.34 mg/kg),and soil organic carbon and soil organic matter contents were the highest in O.japonicus.Correlation analysis showed that root mycorrhizal infection rate and entry points in turfgrass plants were significantly negatively correlated with soil organic carbon,organic matter,and easily extractable glomalin-related soil protein contents,and were significantly positively correlated with root difficultly-extractable glomalin content.It concluded that the mycorrhizal status of the four turfgrass plants was good in the field and could be regulated mainly by soil nutrients,root soluble sugar and glomalin