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以平邑甜茶为试材进行连作土壤盆栽试验,研究在连作土壤中添加不同量的残根对幼苗生长和土壤环境的影响。结果表明连作土壤中添加0.3%的残根可提高平邑甜茶幼苗的生物量,当残根添加量为0.6%~2.4%时,则对幼苗生长有抑制作用;残根的加入也改变了土壤微生物的数量,与对照相比,0.6%、1.2%和2.4%处理使细菌总量分别减少19.36%、30.78%和39.6%,但放线菌和真菌数量明显增加;连作土壤中施入残根,显著增加了土壤中酚酸类物质的含量,0.6%、1.2%和2.4%使春季酚酸类物质总含量,分别增加57.49%、116.20%和131.71%,秋季分别增加29.03%、49.65%和70.27%;另外,残根的施入也影响了土壤酶活性,0.6%、1.2%和2.4%使土壤脲酶、蔗糖酶活性都有不同程度的降低,但中性磷酸酶活性有所升高。由此可见,连作土壤中残根含量对平邑甜茶幼苗的影响存在低促高抑的现象,当残根施入量大于0.3%后,则抑制幼苗生长,加重了连作障碍程度。
The pot experiment was conducted with potted sweet potato as test material to study the effects of adding different amounts of residual roots on the growth of seedlings and soil environment in continuous cropping soil. The results showed that adding 0.3% of residual roots to continuous soils increased the biomass of seedlings. When the content of residual roots was 0.6% ~ 2.4%, the growth of seedlings was inhibited. The addition of residual roots also changed the soil Compared with the control, 0.6%, 1.2% and 2.4% of the total amount of microorganisms decreased the total amount of bacteria by 19.36%, 30.78% and 39.6% respectively, but the number of actinomycetes and fungi increased obviously. , Which significantly increased the content of phenolic acids in soil. The total content of phenolic acids in spring increased by 57.49%, 116.20% and 131.71% respectively in the spring, increased by 29.03% and 49.65% in autumn and increased by 0.6%, 1.2% and 2.4% 70.27%. In addition, the application of residual roots also affected soil enzyme activities. Soil urease and invertase activities decreased to some extent with 0.6%, 1.2% and 2.4% respectively, but the activity of neutral phosphatase increased. Thus, the effect of residual root content in continuous cropping soil on the growth of Malus hupehensis Rehd. Seedlings was low and inhibited. When the amount of residual root application was more than 0.3%, the growth of seedlings was inhibited and the degree of continuous cropping obstacle was aggravated.