沙化对高寒草甸土壤磷素组分的影响

李冬梅; 尹霞; 李良安; 刘淑英; 高永恒; 王平

doi:10.13961/j.cnki.stbctb.2023.06.009

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沙化对高寒草甸土壤磷素组分的影响

试验研究

- 沙化对高寒草甸土壤磷素组分的影响
- Effects of Desertification on Phosphorus Fractions of Alpine Meadow Soils
- 水土保持通报 2023年43卷第6期页码：65-71
- 作者机构：
  
  1. 甘肃农业大学资源与环境学院,甘肃,兰州,730070
  2. 中国科学院成都生物研究所,四川,成都,610041
- 作者简介：
- 基金信息：
  
  国家重点研发计划项目“若尔盖退化高寒草地恢复关键过程研究”（2016YFC0501802）
- DOI：10.13961/j.cnki.stbctb.2023.06.009
  中图分类号： S812.2
- 纸质出版：2023
- 稿件说明：
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李冬梅, 尹霞, 李良安, 等. 沙化对高寒草甸土壤磷素组分的影响[J]. 水土保持通报, 2023,43(6):65-71.

Li Dongmei, Yin Xia, Li Liangan, et al. Effects of Desertification on Phosphorus Fractions of Alpine Meadow Soils[J]. Bulletin of Soiland Water Conservation, 2023, 43(6): 65-71.
李冬梅, 尹霞, 李良安, 等. 沙化对高寒草甸土壤磷素组分的影响[J]. 水土保持通报, 2023,43(6):65-71. DOI： 10.13961/j.cnki.stbctb.2023.06.009.

Li Dongmei, Yin Xia, Li Liangan, et al. Effects of Desertification on Phosphorus Fractions of Alpine Meadow Soils[J]. Bulletin of Soiland Water Conservation, 2023, 43(6): 65-71. DOI： 10.13961/j.cnki.stbctb.2023.06.009.

摘要

[目的

]

土壤磷素组分决定着土壤演变过程中磷素的迁移和可用性。探讨高寒草甸不同退化程度下土壤磷组分的空间分布特征，为沙化草甸植被恢复提供科学参考。[方法

]

以青藏高原若尔盖沙化高寒草甸土壤为研究对象，采用修正后的Hedley磷素分级方法，探究未沙化、轻度、中度和重度沙化程度下高寒草甸土壤磷组分变化。[结果

]

①随着沙化程度的加剧，土壤有机碳、全氮、全磷、速效磷及含水量显著降低（p

0.05）；pH值显著升高（p

0.05）。②土壤树脂态磷（Resin-Pi）、碳酸氢钠磷（NaHCO

-P）、氢氧化钠磷（NaOH-P）、稀盐酸无机磷（D.HCl-Pi）和浓盐酸磷（C.HCl-P）含量随沙化程度的加剧均出现显著（p

0.05）下降，其中在中度和重度沙化下有机磷组分含量较无机磷下降更为明显。③相关性分析显示，在高寒草甸沙化过程中土壤磷素组分的转化主要发生在D.HCl-Pi，NaHCO

-P与氢氧化钠有机磷（NaOH-Po）组分之间；而HCl-P，NaOH-P和Resin-Pi是植物生长重要的磷源。[结论

]

沙化对土壤碳氮、水分、pH值和磷素组分有显著影响，沙化导致土壤碳氮、水分及pH值和磷素组分发生不同程度的变异，且多发生于沙化中后期；在高寒草甸沙化土壤中HCl-P，NaOH-P和Resin-Pi是植物生长重要的磷源。

Abstract

[Objective] Soil phosphorus fractions determine the migration and availability of phosphorus during soil evolution. The spatial distribution characteristics of soil phosphorus fractions in alpine meadows under different desertification levels were studied in order to provide a scientific reference for vegetation restoration in sandy meadows. [Methods] The modified Hedley phosphorus classification method was used to determine changes in phosphorus fraction in alpine meadow soils under different degrees of desertification (non-desertification; and light

medium and heavy desertification) using desertifed Zoige alpine meadow soils on the Qinghai-Tibet Plateau. [Results] ① Soil organic carbon

total nitrogen

total phosphorus

active phosphorus

and water content decreased significantly (p<0.05) with increasing sand content; pH value increased significantly (p<0.05). ② Soil Resin-Pi

NaHCO3-P

NaOH-P

D.HCl-Pi

and C.HCl-P contents all decreased significantly (p<0.05) with increasing sand content. Organic phosphorus fractions decreased more significantly than inorganic phosphorus fractions under moderate and severe desertification. ③ Correlation analysis showed that the conversion of soil phosphorus fractions during desertification in alpine meadows occurred mainly between D.HCl-Pi and NaHCO3-P and NaOH-Po. HCl-P

NaOH-P

and Resin-Pi were important phosphorus sources for plant growth. [Conclusion] Desertification produced significant effects on soil carbon

nitrogen

moisture and pH value

and on phosphorus fractions. Desertification also produced different degrees of variability in soil carbon

nitrogen

moisture

and pH value

and on phosphorus fractions

and mostly occurred in the middle and late stages of desertification. HCl-P

NaOH-P

and Resin-Pi were important phosphorus sources for plant growth in desertified alpine meadow soils.

关键词

Keywords

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