State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,ISWC made new progress in the effects of nitrogen addition on C-N-P stoichiometry and microbial nutrient limitation
Update time:2022-06-20
Recently, Liu Guobin's research team published a paper entitled “Impact of nitrogen addition on plant-soil-enzyme C–N–P stoichiometry and microbial nutrient limitation” in the journal of Soil Biology and Biochemistry (G2 journal of the school). Dr. Xu Hongwei is the first author, Professor Xue Sha is the corresponding author, and the State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation is the first institution. This research was funded by the National Natural Science Foundation of China (42130717; 42171301), the Shaanxi Science Fund for Distinguished Young Scholars (2021JC-50), and the Fundamental Research Funds for the Central Universities (2452021165).
Global atmospheric nitrogen deposition significantly affects the nutrient cycling and C-N-P stoichiometry in ecosystems. However, the effects of nitrogen addition on plant, soil, and microbial C-N-P stoichiometry have not been quantified. Here, a global meta-analysis was conducted based on 898 pairwise observations to analyze the impact of nitrogen addition on plant-soil-enzyme C-N-P stoichiometry and microbial nutrient limitation in different ecosystem types (cropland, grassland, and forest) (Fig. 1).
Fig. 1. Global distribution of 164 study sites used in this meta-analysis.
Results showed that nitrogen addition significantly decreased plant C:N (shoot: 16.5%, root: 27.1%, litter: 16.5%), soil C:N (5.9%), enzyme C:P (1.2%), and enzyme N:P (5.1%), whereas significantly increased soil C:P (4.9%), enzyme C:N (7.1%), vector angle (4.4%), vector length (3.9%), and plant N:P (shoot: 24.1%, root: 23.8%, and litter: 13.5%). Furthermore, nitrogen addition mainly affected the enzyme C:N and vector length in grasslands. Additionally, the changes in C:N in plants, soil, and enzymes, and vector angle and length were higher at nitrogen addition intensity of >10 g N m-2 yr-1 (Fig. 2).
The study indicated that nitrogen addition significantly reduces C:N in plants and soil, but increases the plant N:P. Moreover, the microbial community is limited by C and P after nitrogen addition. Due to the different nutrient absorption strategies and efficiencies of different ecosystem types, nitrogen addition affects the microbial C limitation in grassland and microbial P limitation in forests. We also observed that nitrogen addition intensity and duration decrease the C:N ratio in plants and soil and weaken the microbial P limitation; nitrogen addition intensity exacerbated the microbial C limitation and nitrogen addition duration weaken the microbial C limitation. The results improve our understanding of the plant-soil-microbial nutrient cycling processes in terrestrial ecosystems under global nitrogen deposition.
Fig. 2 Effects of nitrogen addition on plant, soil, and microbial C-N-P stoichiometry
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State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,ISWC made new progress in the effects of nitrogen addition on C-N-P stoichiometry and microbial nutrient limitation
Recently, Liu Guobin's research team published a paper entitled “Impact of nitrogen addition on plant-soil-enzyme C–N–P stoichiometry and microbial nutrient limitation” in the journal of Soil Biology and Biochemistry (G2 journal of the school). Dr. Xu Hongwei is the first author, Professor Xue Sha is the corresponding author, and the State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation is the first institution. This research was funded by the National Natural Science Foundation of China (42130717; 42171301), the Shaanxi Science Fund for Distinguished Young Scholars (2021JC-50), and the Fundamental Research Funds for the Central Universities (2452021165).
Global atmospheric nitrogen deposition significantly affects the nutrient cycling and C-N-P stoichiometry in ecosystems. However, the effects of nitrogen addition on plant, soil, and microbial C-N-P stoichiometry have not been quantified. Here, a global meta-analysis was conducted based on 898 pairwise observations to analyze the impact of nitrogen addition on plant-soil-enzyme C-N-P stoichiometry and microbial nutrient limitation in different ecosystem types (cropland, grassland, and forest) (Fig. 1).
Fig. 1. Global distribution of 164 study sites used in this meta-analysis.
Results showed that nitrogen addition significantly decreased plant C:N (shoot: 16.5%, root: 27.1%, litter: 16.5%), soil C:N (5.9%), enzyme C:P (1.2%), and enzyme N:P (5.1%), whereas significantly increased soil C:P (4.9%), enzyme C:N (7.1%), vector angle (4.4%), vector length (3.9%), and plant N:P (shoot: 24.1%, root: 23.8%, and litter: 13.5%). Furthermore, nitrogen addition mainly affected the enzyme C:N and vector length in grasslands. Additionally, the changes in C:N in plants, soil, and enzymes, and vector angle and length were higher at nitrogen addition intensity of >10 g N m-2 yr-1 (Fig. 2).
The study indicated that nitrogen addition significantly reduces C:N in plants and soil, but increases the plant N:P. Moreover, the microbial community is limited by C and P after nitrogen addition. Due to the different nutrient absorption strategies and efficiencies of different ecosystem types, nitrogen addition affects the microbial C limitation in grassland and microbial P limitation in forests. We also observed that nitrogen addition intensity and duration decrease the C:N ratio in plants and soil and weaken the microbial P limitation; nitrogen addition intensity exacerbated the microbial C limitation and nitrogen addition duration weaken the microbial C limitation. The results improve our understanding of the plant-soil-microbial nutrient cycling processes in terrestrial ecosystems under global nitrogen deposition.
Fig. 2 Effects of nitrogen addition on plant, soil, and microbial C-N-P stoichiometry
Link: https://doi.org/10.1016/j.soilbio.2022.108714