Distribution Characteristics and Influencing Factors of Inorganic Phosphorus in Soil Profiles During Ecological Restoration in Karst Mountain Areas

Cai Xinlin; Shu Yingge; Chen Mengjun

doi:10.13961/j.cnki.stbctb.2020.02.015

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Distribution Characteristics and Influencing Factors of Inorganic Phosphorus in Soil Profiles During Ecological Restoration in Karst Mountain Areas

- Distribution Characteristics and Influencing Factors of Inorganic Phosphorus in Soil Profiles During Ecological Restoration in Karst Mountain Areas
- Bulletin of Soiland Water Conservation Vol. 40, Issue 2, Pages: 107-114(2020)
- 作者机构：
  
  贵州大学农学院,贵州,贵阳,550025
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2020.02.015
  CLC： S153.6
- Published：2020
- 稿件说明：
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Cai Xinlin, Shu Yingge, Chen Mengjun. Distribution Characteristics and Influencing Factors of Inorganic Phosphorus in Soil Profiles During Ecological Restoration in Karst Mountain Areas[J]. Bulletin of Soiland Water Conservation, 2020, 40(2): 107-114.
DOI：

Cai Xinlin, Shu Yingge, Chen Mengjun. Distribution Characteristics and Influencing Factors of Inorganic Phosphorus in Soil Profiles During Ecological Restoration in Karst Mountain Areas[J]. Bulletin of Soiland Water Conservation, 2020, 40(2): 107-114. DOI： 10.13961/j.cnki.stbctb.2020.02.015.

摘要

[目的] 研究贵州喀斯特高原峡谷生态恢复过程中土壤剖面无机磷的形态分布特征，为喀斯特山区生态恢复过程土壤磷素的研究及科学管理提供科学依据。[方法] 选取贵州省晴隆县莲城镇内4种代表性样地（耕地、退耕还草地、荒草地和林草间作地）为对象，研究土壤无机磷形态特征及影响因素。[结果] 4种代表性样地土壤全磷和速效磷含量分别在1.96~3.88 g/kg，1.16~11.25 mg/kg范围。无机磷总量在591.39~1 024.79 mg/kg之间，表现为：耕地 > 退耕还草地 > 林草间作地 > 荒草地。不同土壤剖面磷素活化系数（PAC）均远小于2%。不同形态的无机磷含量依次表现为：O-P > Fe-P > Ca-P > Al-P；各形态的无机磷均与速效磷呈极显著正相关关系（O-P除外）；各无机磷形态之间呈显著相关关系。不同形态的钙素（水溶性钙和交换性钙）以及pH值、黏粒含量均会影响各形态无机磷的比例以及相互间的转化。[结论] 在生态恢复过程中，研究区由耕地→退耕还草地→荒草地→林草间作地，地表植物逐渐恢复，土壤理化性质得到了改善，土壤磷素含量也随之增加。

Abstract

[Objective] The distribution characteristics of inorganic phosphorus in the soil profile during the ecological restoration process in the karst plateau canyon of Guizhou Province were studied

in order to provide a scientific basis for the research and scientific management of soil phosphorus in the ecological restoration process in karst mountain.[Methods] Four types of representative plots (cultivated land

converted cropland to grassland

barren grassland

and forest-grass intercropping land) were selected in Liancheng Town

Qinglong County

Guizhou Province

to study the morphological characteristics and influencing factors of soil inorganic phosphorus.[Results] The contents of total phosphorus and available phosphorus in four representative plots were 1.96~3.88 g/kg and 1.16~11.25 mg/kg

respectively. The total amount of inorganic phosphorus ranged from 591.39 to 1024.79 mg/kg

which was manifested as cultivated land > returning cultivated land to grassland > forest-grass intercropping land > wild grassland. Phosphorus activation coefficient (PAC) in different soil profiles was much less than 2%. The content of inorganic phosphorus in different forms was showed as follows:OP > Fe-P > Ca-P > Al-P. All forms of inorganic phosphorus showed a very significant positive correlation with fast-acting phosphorus (except OP). Inorganic phosphorus in different forms was positively correlated with available phosphorus. Different forms of calcium (water-soluble calcium and exchangeable calcium)

as well as pH value and clay content

affected the proportion and conversion of inorganic phosphorus.[Conclusion] In the process of ecological restoration

the research area gradually recovered from cultivated land to grassland

to wild grassland

and to forest and grass intercropping. The soil physical and chemical properties were improved

and the soil phosphorus content was increased.

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