| 黄棕壤铁铝氧化物与土壤稳定性有机碳和氮的关系 |
| 摘要点击 2746 全文点击 1401 投稿时间：2009-12-31 修订日期：2010-03-17 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 黄棕壤 铁铝氧化物 稳定性有机碳 稳定性有机氮 C稳/N稳 稳定性指数（SI） |
| 英文关键词 yellow-brown soil Fe, Al oxides stable organic carbon stable organic nitrogen |
|
| 中文摘要 |
| 用6%NaOCl氧化不同粒级的黄棕壤，得到稳定性有机碳和氮的样品.用选择性溶提技术提取铁铝氧化物的含量，与稳定性有机碳和氮的关系表明：在2～250 μm粒级上，游离铁、无定形铁和络合态铁含量的变化范围分别为6～60.8 g/kg、 0.13～4.8 g·kg-1和0.03～0.47 g·kg-1，在 < 2 μm粒级上分别为43.1～170 g·kg-1、 5.9～14.0 g·kg-1和0.28～0.78 g·kg-1. 在 >2 μm粒级上，无定形铝和络合态铝含量变化范围分别为0.08～1.34 g/kg和0.11～0.47 g/kg，在 <2 μm粒级上分别为2.96～6.20 g·kg-1和0.38～0.78 g·kg-1.水稻土黄棕壤的选择性溶提铁的含量一般高于旱地黄棕壤，而选择性溶提铝的含量低于旱地黄棕壤.在 2～250 μm粒级上，土壤稳定性有机碳和有机氮含量变幅分别为0.93～6.0 g·kg-1和0.05～0.36 g·kg-1，在< 2 μm粒级上分别为6.05～19.3 g·kg-1和0.61～2.1 g·kg-1，水稻土的稳定性有机碳和氮的含量高于旱地黄棕壤.在 2～250 μm粒级上，稳定性有机碳与有机氮比值（C稳/N稳）的变幅为9.50～22.0，在 < 2 μm粒级上分别为7.43～11.54.在 2～250 μm粒级上，土壤有机碳（氮）的稳定性指数SIC和SIN的变化分别为14.3～50.0和11.9～55.6，在 <2 μm粒级上分别为53.72～88.80 和40.64～70.0；旱地黄棕壤的SIC和SIN一般低于水稻土的，水稻土黄棕壤有利于有机碳和氮的保存.各种形态的铁铝氧化物含量与稳定性有机碳（氮）含量呈极显著正相关，且氧化物铁铝含量和稳定性有机碳（氮）含量在黏粒部分最高，即细粒级能保护土壤有机碳（氮）. |
| 英文摘要 |
| The stable organic carbon and nitrogen of the different particles were gained by oxidation of 6% NaOCl in the yellow-brown soils. The relationships between the contents of selective extractable Fe/Al and the stable organic carbon/nitrogen were investigated. It shown that amounts of dithionite-citrate-(Fed) and oxalate-(Feo) and pyrophosphate extractable (Fep) were 6-60.8 g·kg-1 and 0.13-4.8 g·kg-1 and 0.03-0.47 g·kg-1 in 2-250 μm particles, respectively; 43.1-170 g·kg-1 and 5.9-14.0 g·kg-1 and 0.28-0.78 g·kg-1 in < 2 μm particles, respectively. The contents of oxalate-(Alo) and pyrophosphate extractable (Alp) were 0.08-1.34 g·kg-1 and 0.11-0.47 g·kg-1 in 2-250 μm particles, respectively; 2.96-6.20 g·kg-1 and 0.38-0.78 g·kg-1 in < 2 μm particles, respectively. And amounts of selective extractable Fe are generally higher in paddy yellow-brown soils than in arid yellow-brown soils, and that of selective extractable Al are lower in the former than in the latter. Amounts of the stable organic carbon and nitrogen, higher in paddy yellow-brown soils than in arid yellow-brown soils, were 0.93-6.0 g·kg-1 and 0.05-0.36 g·kg-1 in 2-250 μm particles, respectively; 6.05-19.3 g·kg-1 and 0.61-2.1 g·kg-1 in < 2 μm particles, respectively. The ratio of the stable organic carbon and nitrogen (Cstable/Nstable）were 9.50-22.0 in 2-250 μm particles and 7.43-11.54 in < 2 μm particles, respectively. The stabilization index (SIC and SIN) of the organic carbon and nitrogen were 14.3-50.0 and 11.9-55.6 in 2-250 μm particles, respectively; 53.72-88.80 and 40.64-70.0 in < 2 μm particles, respectively. According to SI, it is lower in arid yellow-brown soils than in paddy yellow-brown soils. The organic carbon and nitrogen are advantageously conserved in paddy yellow-brown soil. An extremely significant positive correlation of the stable organic carbon and nitrogen with selective extractable Fe/Al is observed. The most amounts between the stable organic carbon and nitrogen and selective extractable Fe/Al appear in clay particles, namely the clay particles could protect the soil organic carbon and nitrogen. |
|
|
|
