|
| Variations in eco-enzymatic stoichiometric characteristics of fluvo-aquic soil with different use intensities in The North China Plain |
| Received:October 12, 2022 Revised:November 03, 2022 |
| View Full Text View/Add Comment Download reader |
| KeyWord:land use intensity;microbial nutrient limitation;soil enzyme activity;eco-enzymatic stoichiometric characteristics;temporary grassland |
| Author Name | Affiliation | E-mail | | LI Shengjun | Key Laboratory of Original Agro-environment Pollution Prevention and Control of Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agroenvironment and Agro-product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SHENG Meijun | Key Laboratory of Original Agro-environment Pollution Prevention and Control of Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agroenvironment and Agro-product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LI Gang | Key Laboratory of Original Agro-environment Pollution Prevention and Control of Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agroenvironment and Agro-product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | ligang20032002@126.com | | YANG Xinyue | Key Laboratory of Original Agro-environment Pollution Prevention and Control of Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agroenvironment and Agro-product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Rui | Key Laboratory of Original Agro-environment Pollution Prevention and Control of Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agroenvironment and Agro-product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LI Jie | Key Laboratory of Original Agro-environment Pollution Prevention and Control of Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agroenvironment and Agro-product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Guilong | Key Laboratory of Original Agro-environment Pollution Prevention and Control of Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agroenvironment and Agro-product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | XIU Weiming | Key Laboratory of Original Agro-environment Pollution Prevention and Control of Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agroenvironment and Agro-product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | xiuweiming@126.com |
|
| Hits: 1394 |
| Download times: 1771 |
| Abstract: |
| To explore the response characteristics of soil enzyme activities and microbial nutrient restriction levels to land use intensity, in the present study, a chronic fixed field experiment was conducted. The experiment had four treatments：one treatment with high use intensity（wheat-maize rotation, MW）; two treatments with middle use intensity（temporary grassland rotation with wheat and maize rotation with temporary grassland, GW and MG, respectively）; one treatment with low use intensity（perennial grassland, PG）. The soil enzyme activities and ecological stoichiometry were analyzed after 6 years. The results indicated decreasing soil pH with decreasing land use intensity（only PG was significant）. PG and GW treatments increased organic carbon（OC）, total nitrogen（TN）, and available phosphorus （AP）contents in soil, thereby increasing the soil C∶N and N∶P ratios. Land use intensity had major impacts on key soil enzymatic activities, with higher activities of β -1, 4-glucosidase（BG）, β -N-acetyl-glucosaminidase + leucine aminopeptidase（NAG + LAP）, alkaline phosphatase（ALP）, C/P ratio of extracellular enzymatic activities（EEAC∶P）, and N/P ratio of extracellular enzymatic activities（EEAN∶P） observed in PG and GW compared with MW and MG treatments, but alleviated P limitation. Correlation analysis suggested that key enzymatic activities showed a positive relationship with OC and TN contents as well as C∶P, and N∶P ratios, but a remarkedly negative association with NH4+-N content. Both EEAC∶P and EEAN∶P ratios were significantly positively correlated with OC content and C∶P and N∶P ratios. However, a significantly negative relationship was observed only between EEAN∶P ratio and NH4+-N content. Random forest analysis illustrated that pH was the main explanatory variant for microbial C limitation, while C∶P and N∶P ratios as well as NH4+-N content contributed more to soil microbial P limitation. These results indicate that integrating temporal grass into agricultural land use management can enhance soil carbon sequestration and nitrogen supply, improve soil enzyme activities, and lower soil microbial P limitation. These findings provide a theoretical basis and technical support for improving soil ecosystem quality under intensive agricultural management. |
|
|
|
