长期不同施肥处理下黄泥土原土和团聚体颗粒组的菲含量变化

研究了太湖地区长期不同施肥处理下黄泥土团聚体颗粒组的组成、有机C含量,以及菲的分布和溶出特点.结果表明,不同施肥处理下,团聚体颗粒组均以0.25 ～ 0.02 mm所占比例最高,其质量分数范围为38.3% ～ 43.6%,而黏粒组所占比例最低仅为7.9% ～ 11.7%.另外,施用猪粪和秸秆可大幅度提高2.00 ～ 0.25 mm颗粒组所占的比例.而不同施肥处理下2.00 ～ 0.25 mm颗粒组的有机C含量最高,介于20.57 ～ 28.32 g/kg,并且施用猪粪和秸秆可提高原土和团聚体颗粒组的有机C含量.施肥处理对团聚体颗粒组的菲含量也有较大影响,以化肥区菲含量最高,其次为无肥区,常规区和秸秆区最低.而不同施肥处理下,菲在团聚体颗粒组中的分布具有相似的特征,主要分布在＜0.002 mm和2.00 ～ 0.25 mm两个颗粒组.长期施肥处理对原土和团聚体颗粒组菲的溶出无显著影响,在电解质作用下菲均无溶出.因此,长期不同施肥处理在影响团聚体颗粒组的组成、有机C含量的同时,也可对黄泥土团聚体颗粒组中的菲分布有着显著的影响.

Effects of Long-Term Fertilization on Phenanthrene Contents of Original Paddy Soil and Aggregate Fractions

This paper studied the characteristics of aggregate composition, organic C content and phenanthrene distribution and leaching in ferric-accumulic stagnic anthrosol from the Tai Lake region under different long-term fertilizations. The results showed that 0.25 ~ 0.02 mm aggregate fraction was dominant, consitituted of 38.3% ~ 43.6% of total aggregates, while clay fraction only constituted of 7.9% ~ 11.7% of the total aggregates. Pig-manure and straw increased significantly the content of 2.00 ~ 0.25 mm aggregate fraction. Organic C content of 2.00 ~ 0.25mm aggregate fraction was highest, reached to 20.57 ~ 28.32 g/kg, pig-manure and straw could increase it too. Fertilization influenced phenanthrene content, chemical fertilizer (CF) increased it most, followed by non-fertilizer (NF), conventional fertilizers (CFM) and straw (CFS). Phenanthrene distributions in aggregate fractions under different fertilizations were similar, mainly contained in <0.002mm and 2.00 ~ 0.25 mm aggregate groups. And long-term fertilization didn't influence significantly phenanthrene leaching in original soil and aggregate fraction, no phenanthrene leaching occurred in electrolyte solution.