Arid
DOI10.1007/s11104-024-06668-w
Stimulation of organic N mineralization by N-acquiring enzyme activity alleviates soil microbial N limitation following afforestation in subtropical karst areas
Liu, Lijun; Zhu, Qilin; Wen, Dongni; Yang, Lin; Ni, Kang; Xu, Xingliang; Cao, Jianhua; Meng, Lei; Yang, Jinling; Zhou, Jinxing; Zhu, Tongbin; Mueller, Christoph
通讯作者Zhu, TB
来源期刊PLANT AND SOIL
ISSN0032-079X
EISSN1573-5036
出版年2024
英文摘要Aims Stoichiometry of soil extracellular enzymes such as the ratios of carbon (C)-, nitrogen (N)-, and phosphorus (P)-acquiring enzymes as well as their vector length and angle are used to reveal the biogeochemical equilibrium between microbial nutrient requirements and soil nutrient availability. However, the dynamics of soil extracellular enzymes activities and microbial N limitation following afforestation remain poorly understood in karst rocky desertification areas. Methods Soil samples were collected from Dodonaea viscosa plantations after 0, 10, 20, and 40 years of afforestation following the abandonment of croplands in a karst rocky desertification area, and a natural restored shrubland soil was served as the control. The activities of C, N, and P extracellular enzymes were measured and the stoichiometric and vector ratios of extracellular enzymes were calculated to quantify microbial nutrient limitation. Results The stoichiometric ratio of soil C: N:P acquisition enzymes was 0.63:1.48:1.0, with a vector angle of 34.7 in croplands, indicating high microbial N limitation. Compared to the croplands, D. viscosa afforestation significantly increased soil C-, N-, and P-acquiring enzyme activities and gradually increased C: N:P stoichiometric ratio and vector angle to 0.75:1.39:1-0.76:1.17:1 and 34.9-38.2, respectively, indicating that afforestation alleviated microbial N limitation. Furthermore, gross N mineralization and gross ammonium immobilization rates increased by 140-278% and 340-801% following afforestation due to the increase in soil organic C and total N contents and the > 2 mm soil aggregates. The vector angle positively correlated with beta-N-acetylglucosaminidase activity, gross N mineralization, and gross ammonium immobilization. Notably, the vector angle of extracellular enzymes following 40-year afforestation was still 6.63% lower than that of the shrubland soil. Conclusion Our results suggested that afforestation could substantially increase gross N mineralization through stimulating beta-N-acetylglucosaminidase activity and gross ammonium immobilization, thereby reducing microbial N limitation. However, this limitation persists even following long-term afforestation in karst rocky desertification areas.
英文关键词Karst Vegetation restoration Soil extracellular enzyme stoichiometry Microbial N limitation Mineralization
类型Article ; Early Access
语种英语
收录类别SCI-E
WOS记录号WOS:001201750000002
WOS关键词ECOENZYMATIC STOICHIOMETRY ; NITROGEN TRANSFORMATIONS ; NUTRIENT ACQUISITION ; RETENTION CAPACITY ; MICROORGANISMS ; CARBON ; ACCUMULATION ; RECOVERY ; NITRATE ; MATTER
WOS类目Agronomy ; Plant Sciences ; Soil Science
WOS研究方向Agriculture ; Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/405094
推荐引用方式
GB/T 7714
Liu, Lijun,Zhu, Qilin,Wen, Dongni,et al. Stimulation of organic N mineralization by N-acquiring enzyme activity alleviates soil microbial N limitation following afforestation in subtropical karst areas[J],2024.
APA Liu, Lijun.,Zhu, Qilin.,Wen, Dongni.,Yang, Lin.,Ni, Kang.,...&Mueller, Christoph.(2024).Stimulation of organic N mineralization by N-acquiring enzyme activity alleviates soil microbial N limitation following afforestation in subtropical karst areas.PLANT AND SOIL.
MLA Liu, Lijun,et al."Stimulation of organic N mineralization by N-acquiring enzyme activity alleviates soil microbial N limitation following afforestation in subtropical karst areas".PLANT AND SOIL (2024).
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