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覆盖栽培经营多年后,雷竹土壤会出现明显的酸化现象。土壤酸化会活化土壤中的铝,从而抑制雷竹的生长。因此,了解集约经营模式下雷竹林土壤铝的形态变化显得尤为重要。采用Tessier连续浸提法分析了不同种植年限下雷竹林土壤中各种形态的铝含量,结果表明:随着种植年限的增加,土壤pH值显著下降,表层土壤活性铝含量增加,雷竹栽种15年后,其在总铝中所占的比例由对照的6.15%增加至10.8%;醋酸铵提取的交换性铝由无到有,在种植15年后心土亦有显著增加;有机络合态铝含量随着种植年限的增加而增加,种植15年时表层土壤较对照增长42%,底层增长27%;其他各形态铝含量则随着种植年限的增加有下降的趋势。土壤pH值,有机质、全氮及交换性酸含量与交换态、铁锰氧化物结合态、有机络合态及残渣态的铝显著相关,而与碳酸盐结合态铝含量无关。
Over many years of cultivation and cultivation, the obvious acidification of the soil occurs. Soil acidification activates aluminum in the soil, thereby inhibiting the growth of the thunder bamboo. Therefore, it is particularly important to understand the morphological changes of soil aluminum in Phyllostachys pubescens forest under intensive management. The Tessier continuous extraction method was used to analyze the contents of aluminum in different forms of Phyllostachys praecox. The results showed that with the increase of planting years, the soil pH decreased significantly and the content of active aluminum in surface soil increased. Year later, its proportion in the total aluminum increased from 6.15% of the control to 10.8%; the exchangeable aluminum extracted by ammonium acetate was non-existent, and the heart soil was also significantly increased after 15 years of planting. The organic complexation state The content of aluminum increased with the increase of planting years. When planted for 15 years, the surface soils increased by 42% compared with the control and the ground floor by 27%. The content of aluminum in other forms decreased with the increase of planting years. Soil pH, organic matter, total nitrogen and exchangeable acid content were significantly correlated with exchangeable, Fe-Mn oxide-bound, organic-bound and residual-state aluminum, but not with carbonate-bound aluminum.