Impact of vegetation zones on soil phosphorus distribution in Northwest China

• Published in: Plant, Soil and Environment
• Main Authors: Pingping Liu, Huarui Ren, Yiling Zhang, Tiantian Wu, Chunli Zheng, Tiancheng Zhang
• Format: Article
• Language: English
• Published: Czech Academy of Agricultural Sciences 2019-02-01
• Subjects: arid area; land cover; soil profile; phosphorus speciation; management practice
• Online Access: https://pse.agriculturejournals.cz/artkey/pse-201902-0003_impact-of-vegetation-zones-on-soil-phosphorus-distribution-in-northwest-china.php
• ISSN: 1214-1178; 1805-9368

Soil phosphorus (P) fraction distribution and correlation at different soil depths along vegetation succession in wetland next to a lake in the Hongjiannao National Nature Reserve, China were studied using the Hedley fraction method. The overall trend for soil P content was calcium-bound P (Ca-P) > organic P (O-P) > aluminum/iron-bound P (Al/Fe-P) > labile-P (L-P). Ca-P and O-P were the predominant P forms in all the soil layers, representing on average 53.8‒84.9% and 12.9‒45.2% of the total P, respectively, whereas L-P (ranging from 0.5 to 1.5 mg/kg) was less than 1%. The soil in the Bassia dasyphylla and Carex duriuscula vegetation zones had the largest P contents. In these two vegetation zones, soil L-P was greatest in the surface soil layer; Al/Fe-P was most abundant in the deep layer; O-P was highest in the middle layer. Ca-P levels were generally similar across all soil layers. Regression analysis showed that distribution of P was highly correlated with organic carbon, total nitrogen and plant biomass. Results showed that the soils under Bassia dasyphylla and Carex duriuscula have considerable carbon input potentials, which would facilitate P mineralization as compared to other plants.