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[Effects of 40 Years of Fertilizer Application on the Characteristics of Soil Enzymatic Stoichiometry in Black Soil].

Authors :
Deng HY
Ma XZ
Liu ZK
Liu YJ
Hao XY
Zhao Y
He JZ
Shen JP
Source :
Huan jing ke xue= Huanjing kexue [Huan Jing Ke Xue] 2024 Aug 08; Vol. 45 (8), pp. 4915-4922.
Publication Year :
2024

Abstract

Microorganisms produce extracellular enzymes to meet elemental requirements and cope with stoichiometric imbalances of resources. To gain insights into the cycling of C, N, and P, the activities of the C∶N∶P acquisition enzymes have been extensively investigated. To detect the effects of long-term fertilization practices on soil nutrient balance and characteristics of soil enzymatic stoichiometry in black soil, four different fertilization treatments were selected: no fertilization (CK), nitrogen fertilizer (N), phosphorus fertilizer (P), and combination of nitrogen and phosphorus fertilizers (NP). Soil samples were collected in both April 2021 and April 2022 to determine soil enzyme activities and their stoichiometric characteristics. The results showed that soil acid phosphatase and β -D-glucosidase activities were significantly higher in the N and NP treatments than in CK by 68%-158% and 26%-222%, respectively. Soil β -N-acetylaminoglucosidase activities were significantly higher in the P and NP treatments, with the highest around 75.48 nmol·(g·h) <superscript>-1</superscript> and 106.81 nmol·(g·h) <superscript>-1</superscript> , respectively. Two-way ANOVA analysis showed that N and P inputs had a great impact on soil enzyme activities. Redundancy analysis showed that the main factors controlling enzyme activities were soil pH, microbial biomass phosphorus, and soil available P content. It was found that N inputs significantly increased enzyme vector length, which was ranged from 1.32 to 1.52, and the enzyme vector angles were all larger than 45°, suggesting C and P co-limited in the black soils. These findings suggest that 40 years of fertilization have had a great impact on soil enzymes and the related resource use strategy, which provides great implications for assessing soil nutrients balance and soil sustainability.

Details

Language :
Chinese
ISSN :
0250-3301
Volume :
45
Issue :
8
Database :
MEDLINE
Journal :
Huan jing ke xue= Huanjing kexue
Publication Type :
Academic Journal
Accession number :
39168707
Full Text :
https://doi.org/10.13227/j.hjkx.202309170