The distribution and availability of phosphorus fractions in restored cut slopes soil aggregates: a case study of subalpine road, Southwest China

doi:10.1007/s11783-023-1642-z

Front. Environ. Sci. Eng.

2023, Vol. 17

Issue (4) : 42 https://doi.org/10.1007/s11783-023-1642-z

RESEARCH ARTICLE

The distribution and availability of phosphorus fractions in restored cut slopes soil aggregates: a case study of subalpine road, Southwest China

Mengke Zhu¹, Bocong Huang¹, Shenghao Ai^2,³, Zongyang Liu¹, Xiaoyan Ai¹, Meihua Sheng¹, Yingwei Ai¹(

)

¹. Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
². Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
³. University of Chinese Academy of Sciences, Beijing 100049, China

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Abstract

● There was no significant difference in soil aggregates TP along altitude gradient.

● Overall, PAC dropped steadily as aggregate size increased.

● In soil aggregate sizes, TPi > TPo > R-P at 3009,3347 and 3654 m except 3980 m.

● Active NaHCO₃-Pi was the main AP source.

● Proportion of small aggregate sizes was emphasized to increase AP storage.

The distribution and availability of phosphorus (P) fractions in restored cut slope soil aggregates, along altitude gradients, were analyzed. Samples were collected at 3009, 3347, 3654 and 3980 m of altitude. We examined soil aggregates total phosphorus (TP), available phosphorus (AP) and phosphorus activation coefficient (PAC), and discovered that there was no significant difference in TP levels between all four altitudes samples (p > 0.05). However, there was a significant difference in AP at 3009, 3347 and 3980 m of altitude (p < 0.05). At the altitudes of 3009, 3347 and 3654 m, the AP accumulation in small size aggregates was more advantageous. Overall, PAC dropped steadily as soil aggregates sizes increased, as shown: PAC (3654 m) > PAC (3347 m) > PAC (3009 m) > PAC (3980 m). In all particle size soil aggregates, the distribution of the P fractions was as follows: total inorganic phosphorus (TPi) > total organic phosphorus (TPo) > residual phosphorus (R-P), at 3009, 3347 and 3654 m, but a different registry was observed at 3980 m of altitude: TPo > TPi > R-P. Through correlation and multiple stepwise regression analysis, it was concluded that active NaHCO₃-Pi was the main AP source. It was also suggested that more attention should be given to the ratio of small particle size aggregates to increase soil AP storage. In order to improve the activation capacity and supply of soil P, along with promotion of the healthy development of soil ecosystem on slope land, it was suggest that inorganic P fertilizer and P activator could be added to soil at both low (3009 m) and high altitudes (3980 m).

Keywords Altitude gradient Restored cut slopes Soil aggregates Phosphorus fraction Available phosphorus

Corresponding Author(s): Yingwei Ai

Issue Date: 24 October 2022

Cite this article:

Mengke Zhu,Bocong Huang,Shenghao Ai, et al. The distribution and availability of phosphorus fractions in restored cut slopes soil aggregates: a case study of subalpine road, Southwest China[J]. Front. Environ. Sci. Eng., 2023, 17(4): 42.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-023-1642-z
https://academic.hep.com.cn/fese/EN/Y2023/V17/I4/42

Fig.1 Study area location and sampling points distribution (four altitude gradients).

Fig.2 Schematic diagram of P fractions extraction sequence in soil aggregates.

Tab.1 TP content (mg/kg) in soil aggregates along altitude gradient

Fig.3 Variation trends of TP and AP in soil aggregate sizes along altitude gradient.

Tab.2 AP (mg/kg) content in soil aggregates along altitude gradient

Fig.4 Variation trends of soil aggregates PAC along altitude gradient. Notes: Mean±SE. PAC= phosphorus activation coefficient.

Tab.3 Correlation analysis of P related indicators and fractions

Fig.5 The P form fractions content in soil aggregate sizes along altitude gradient.

Fig.6 The P stability fractions content in soil aggregate sizes along altitude gradient.

Tab.4 Multiple stepwise regression analysis of soil aggregates P fractions (X) on AP (Y)

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