Low molecular weight organic acids regulate soil phosphorus availability in the soils of subalpine forests, eastern Tibetan Plateau

CATENA ◽  
2021 ◽  
Vol 203 ◽  
pp. 105328
Author(s):  
He Zhu ◽  
Haijian Bing ◽  
Yanhong Wu ◽  
Hongyang Sun ◽  
Jun Zhou
Keyword(s):  
Molecular Weight ◽  
Tibetan Plateau ◽  
Organic Acids ◽  
Soil Phosphorus ◽  
Phosphorus Availability ◽  
Low Molecular Weight ◽  
Eastern Tibetan Plateau ◽  
Subalpine Forests

scholarly journals Effect of low-molecular-weight organic acids on phosphorus soil activation: A laboratory study of the soils from Wangbeng section of the Huaihe River Basin, China  

2021 ◽  
Author(s):  
Jinxin Zhang ◽  
Liangmin Gao ◽  
Zhendong Pang ◽  
Linghan Liu ◽  
Xiaoqing Chen ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Citric Acid ◽  
Organic Acids ◽  
Soil Phosphorus ◽  
Soil Samples ◽  
Low Molecular Weight ◽  
Huaihe River Basin ◽  
Huaihe River ◽  
Activation Rate ◽  
The Huaihe River

Farmland soil samples from the northern and southern banks of the Wangbeng section of the Huaihe River Basin, China, were collected and treated with three different low-molecular-weight organic acids (LMWOAs) (malic acid, citric acid, oxalic acid). This study aimed to determine how these acids affect soil phosphorus activation. The results showed that the average activation rate of total phosphorus, inorganic phosphorus, Fe/Al-P and Ca-P in soil samples from the southern bank treated with malic and citric acid was above 162%, except for organic phosphorus, with the highest at 192.04%. The three organic acids displayed significantly greater phosphorus activation in the northern bank soil samples than those of the southern bank. However, the overall average activation rate in the northern bank soils was lower than that of the southern bank. The four factors of phosphorus species, acid species, acid concentration, and treatment time had significant effects on phosphorus activation in the soils from both banks. This study showed that the three organic acids significantly activated inert phosphorus in the soil. Among them, malic acid and citric acid had a stronger effect on activating soil phosphorus and increased the available soil phosphorus utilisation rate.  

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