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以福建省三明市本底条件一致的三片林分的土壤作为研究对象,采用湿筛法测定了水稳定性团聚体粒径分布,分析了不同形态铁铝氧化物含量与>0.25 mm大团聚体数量及团聚体平均重量直径(MWD)的关系。结果表明:(1)不同形态铁铝氧化物含量呈现出米槠次生林>米槠人工林>杉木人工林,游离结晶态(Fed、Ald)>无定形(Feo、Alo)>络合态(Fes、Als)。(2)>0.25 mm大团聚体含量呈现米槠次生林>米槠人促林>杉木人工林,林分之间差异显著,MWD值的趋势与之相似。(3)线性回归分析表明:不同形态铁铝氧化物均与>0.25 mm水稳定性大团聚体数量及MWD值达到显著甚至极显著相关,但通过分析相关系数R和显著性P说明氧化铝可能比氧化铁更有助于大团聚体的形成与稳定,无定形及络合态铁铝氧化物比游离态铁铝氧化物更能促进大团聚体的形成与稳定。
Taking the soil with the same background conditions in Sanming City of Fujian Province as the study object, the particle size distribution of water-stable aggregates was determined by wet sieving method. The effects of different forms of Fe-Al oxide content and> 0.25 mm agglomeration The number of body and the average weight diameter of aggregates (MWD). The results showed that: (1) The contents of Fe and Al in different forms showed as follows: secondary forest> poplar> poplar plantation> Chinese fir plantation, Fed-Ald, Feo, , Als). (2) The content of macro-aggregates> 0.25 mm showed the secondary forest of Mianyang> the forest of Mianyang> the difference was significant between Chinese fir plantation and stand, and the trend of MWD value was similar. (3) The linear regression analysis showed that all the morphologies of Fe-Al oxides were significantly or extremely significantly correlated with the> 0.25 mm water-stable macroaggregates and MWD values, but the analysis of correlation coefficient R and significance P indicated that alumina may More than iron oxide is more conducive to the formation and stability of large aggregates, amorphous and chelated iron and aluminum oxide than free iron and aluminum oxide to promote the formation and stability of large aggregates.