【摘要】 为了探讨在重金属胁迫下,不同用量（0,1%,4%,8%）生物炭与间作望江南（Cassia occidentalis）对土壤碳氮养分、刨花润楠（Machilus pauhoi）及望江南株高、生物量和根系形态的影响,研究生物炭与间作联合对刨花润楠促生增效效应,以刨花润楠为研究对象,开展了室内盆栽试验。结果表明:在Cd,Cr和Zn胁迫土壤中,间作望江南对土壤碳氮含量的影响不显著,生物炭则显著增加了土壤碳氮含量及碳氮比,且随施用量的增加而增加。生物炭与间作互作对两种植物生长前期的株高影响不明显,但随生长期的延长,各处理间两种植物的长势差异均逐渐显现,不同用量生物炭处理下望江南株高间差异不显著,但与对照相比,均显著增加。同时,施加生物炭有助于根系形态的发育及干物质积累,相比于单作下对照（CK）,间作与生物炭（T₃）复合处理下刨花润楠根系和地上部干重分别增加了81.48%和122.52%,与不施炭相比,各生物炭处理下,望江南根系和地上部干重增幅分别为27.12%～39.63%和17.19%～19.03%;生物炭显著增加了望江南及刨花润楠根系各形态参数,与单作相比,间作下刨花润楠根系形态参数也略有增加,但影响不显著。生物炭与间作互作比各自单一处理对植物的促生增效作用更明显。该研究为轻度污染区植被造林提供科学依据和参考。更多还原

【Abstract】 Machilus pauhoi was taken as the test material, a pot experiment at greenhouse was conducted to study the effect of the combination of different dosages（0, 1%, 4%, 8%） of biochar and intercropping Cassia occidentalis on soil carbon and nitrogen nutrient, Machilus pauhoi and Cassia occidentalis plant height, biomass and root morphology under heavy metal stress, in order to study the combination of biochar and intercropping on the Machilus pauhoi growth promoting synergistic effect. The results showed that,under Cd,Cr and Zn stresses,the effect of intercropping on the soil carbon and nitrogen contents was not significant; the soil carbon and nitrogen contents and C/N ratio significantly increased with the increase of the biochar application amount; the influences of biochar and intercropping on the plant height growth of the two species were not obvious at early growth stage, but with the extension of their growing periods, the growth differences of the two species between different treatments both started to appear gradually. There was no significant difference of the Cassia occidentalis plant height among different amounts of biochar application, while the plant height in biochar treatment groups were significantly higher than that in control group. At the same time, biochar was helpful for the development of root morphology and dry matter accumulation. Compared with monoculture under control（CK）, Machilus paunoi root and shoot dry weight increased by 81.48% and 122.52% with the combination of T₃ treatment and intercropping. Compared with no application of biochar, the growth rate of Cassia occidentalis root and shoot dry weight increased by 27.12%～39.63% and 17.19%～19.03%, respectively, under each biochar treatments. Biochar significantly increased the morphological parameters of Cassia occidentalis and Machilus paunoi root. Compared with monoculture, Machilus paunoi root morphological parameters in intercropping treatments also increased, but the effect was not significant. The interaction effect of biochar and intercropping on plant growth was more obvious than single treatment. This study could provide scientific basis and reference for the vegetation afforestation in the mild polluted areas.更多还原