Influence of Vegetation Restoration Process on Mineral Nitrogen Accumulation in Soil Profile in Hilly and Gully Region of Loess Plateau--Sample with Zhifanggou watershed experimental area

HUANG Si-guang~

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Influence of Vegetation Restoration Process on Mineral Nitrogen Accumulation in Soil Profile in Hilly and Gully Region of Loess Plateau--Sample with Zhifanggou watershed experimental area

更新时间：2024-11-07

- Influence of Vegetation Restoration Process on Mineral Nitrogen Accumulation in Soil Profile in Hilly and Gully Region of Loess Plateau--Sample with Zhifanggou watershed experimental area
- Vol. 18, Issue 6, Pages: 58-62(2004)
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  CLC： S158.3
- Published：2004
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HUANG Si-guang~. Influence of Vegetation Restoration Process on Mineral Nitrogen Accumulation in Soil Profile in Hilly and Gully Region of Loess Plateau--Sample with Zhifanggou watershed experimental area[J]. 2004, 18(6): 58-62.
DOI：

HUANG Si-guang~. Influence of Vegetation Restoration Process on Mineral Nitrogen Accumulation in Soil Profile in Hilly and Gully Region of Loess Plateau--Sample with Zhifanggou watershed experimental area[J]. 2004, 18(6): 58-62. DOI：

摘要

根据不同植被类型和不同植被恢复年限

在位于半干旱黄土高原丘陵沟壑区延安安塞纸坊沟流域采集68个剖面样品

探讨植被恢复过程土壤剖面中残留矿质态氮的变化;同时采取该流域连续14年施用不同肥料处理的坡地长期定位试验剖面土样

研究连续施肥对农田土壤剖面残留NO3--N累积的影响。结果表明

NH4 -N在土壤剖面中的分布和累积基本不受植被恢复及植类型的影响

但NO3--N在土壤剖面中的累积量随植被恢复而下降。林地、草地和农田0～50cm土层平均累积的NO3--N分别为17 4kg/hm2

14 9kg/hm2和39 9kg/hm2;林地和草地剖面中NO3--N累积量所占矿质氮总累积量比例远小于NH4 -N

而对农田土壤

剖面中NO3--N累积量所占比例与NH4 -N所占比例基本相当;农田土壤剖面中NO3--N累积量所占比例显著大于林地和草地。长期定位试验结果进一步证明了在农田连续施用氮肥会显著增加土壤剖面中残留NO3--N累积

当农田退耕还林还草后

累积的这一部分NO3--N因植物吸收利用、土壤生物固定和损失等途径而下降

最终达到低而稳定的水平。

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