矿山土地复垦不同压实密度土壤中菌根作用机理及生态效应研究

Study on mycorrhizal mechanism and ecological effect of different compaction density soil in mine land reclamation

矿山复垦区土壤采用分层覆盖、碾压的工程技术方法,土壤密实程度明显高于普通土壤,不利于植物的生长。采用实验室实验及对比分析方法,模拟土壤压实密度为1.35、1.65、1.95 g/cm^(3)共3个水平试样,选择丛枝菌根真菌,研究在不同压实密度土壤中接种菌根对植物生长的促进效应及作用机理。结果表明,通过接种摩西球囊菌(G.mosseae),菌根与植物的亲和程度较高,菌丝长度显著增加,扩大了植物根系的活动空间和作用范围,提高了植物的抗逆性并促进了植物的生长,提高了植物从土壤中吸收N、P、K等养分的能力及生长量,使植物在1.65 g/cm^(3)密度水平的土壤中生长的适宜程度提升至与1.35 g/cm^(3)密度水平相当。

The engineering technology method of stratified covering and rolling is adopted in the soil of mine reclamation area,and the degree of soil compaction is obviously higher than that of ordinary soil,which is not conducive to the growth of plants.Laboratory experiments and comparative analysis were used to simulate three horizontal soil samples with compacted densities of 1.35 g/cm^(3),1.65 g/cm^(3)and 1.95 g/cm^(3).Arbuscular mycorrhizal fungi were selected to study the promoting effect and mechanism of mycorrhizal fungi on plant growth in soil with different compaction densities.The results show that,by the Glomus mosseae mycorrhizal inoculation,the affinity degree between mycorrhizal and plants is high,the length of hyphae is increased significantly,the activity space and scope of plant roots are expanded and the resistance and growth condition of plant are improved,the ability and growth of plants to absorb N,P,K and other nutrients from the soil are improved,so that the suitable growth degree of plants in the soil density level of 1.65 g/cm^(3)is improved to the same as that of 1.35 g/cm^(3).