Impacts of Vegetation Types on Soil Nitrogen in Ziwuling Forest Region

WANG Bai-qun; WU Jin-shui; ZHAO Shi-wei

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Impacts of Vegetation Types on Soil Nitrogen in Ziwuling Forest Region

- Impacts of Vegetation Types on Soil Nitrogen in Ziwuling Forest Region
- Bulletin of Soiland Water Conservation Vol. 21, Issue 6, Pages: 23-25(2002)
- 作者机构：
  
  1. 中国科学院, 水利部, 水土保持研究所
  2. 西北农林科技大学, 陕西, 杨凌,712100
- 作者简介：
- 基金信息：
- DOI：
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- Published：2002
- 稿件说明：
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WANG Bai-qun, WU Jin-shui, ZHAO Shi-wei. Impacts of Vegetation Types on Soil Nitrogen in Ziwuling Forest Region[J]. Bulletin of Soiland Water Conservation, 2002, 21(6): 23-25.
DOI：

WANG Bai-qun, WU Jin-shui, ZHAO Shi-wei. Impacts of Vegetation Types on Soil Nitrogen in Ziwuling Forest Region[J]. Bulletin of Soiland Water Conservation, 2002, 21(6): 23-25. DOI：

摘要

以黄土丘陵沟壑区的子午岭次生林区主要植被类型为对象

研究了植被类型对土壤全氮的影响作用。结果表明

长期草地(白羊草地和茭蒿草地)、灌木林和乔木林地表层土壤(0-5cm)的全氮含量为坡耕地表层土壤全氮含量的1.4～2.5倍。长期草地和乔木林地表层土壤(0-5cm)全氮的含量相近

高于灌木林地及恢复草地表层土壤的全氮含量。在林草植被下

表层土壤的全氮含量明显高于下层土壤的含量

土壤剖面中全氮的含量随着土层深度的增加而表现为下降趋势。与坡耕地相比

草、灌木和乔木可以分别提高0-15cm

0-25cm和0-50cm土层中土壤全氮的含量

表明了植被类型对土壤全氮效应的差异性。研究结果说明

在黄土丘陵区

坡地退耕还林

恢复植被

可以有效地驱动上层土壤氮素含量逐渐提高。

Abstract

The study was conducted to exam the impacts of the vegetation types on soil nitrogen in Ziwuling secondary forest region loca ted in the middle part of the loess plateau.It was shown that the vegetation types could exert significant effects on soil total nitrogen according to the study results.The(0-5cm)total nitrogen contents of topsoilin the permanent grassla nd

bush land and forestland are 1.4～2.5 times of that in the farmland.The total nitrogen content of topsoil in the permanent grassland is almost similar to that in the forestland

which is higher than that in the bush land and restoring grassland.The total nitrogen contents of to psoil are much higher than that in the deep soil layers

and the soil total nitrogen contents decrease with the increase of soil depth in the profile in the grassland

bush land and forestland.Grass

bush and forest can raise the soil total nitrogen contents at the depth of 0-15cm

0-25cm and 0-50cm

respectively

indicating that soil nitrogen improvement depends on the vegetation types.The study results suggest that the soil total nitrogen can be significantly improved by conversing the farmland to grassland or forestland on the loess plateau.

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references

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