Using Ecological Stoichimetric Characteristies to Inform Grassland Management in the Karst Desertification Area
Abstract
:1. Introduction
2. Materials and Methods
2.1. Research Area
2.2. Sample Plot Setting
2.3. Sample Collection
2.4. Determination of Samples
2.5. Data Processing
3. Results
3.1. C, N and P Contents and Stoichiometric Ratios of Grassland Plants under Different Utilization Methods
3.2. C, N and P Contents and Stoichiometric Ratio of Grassland Soil under Different Utilization Methods
3.3. MBC, MBN and MBP Contents and Stoichiometric Ratio of Grassland Soil under Different Utilization Methods
3.4. Correlation Analysis of C, N, P Contents and Stoichiometric Ratios in Plant–Soil–Microorganism
4. Discussion
4.1. Plant C, N and P Content and Stoichiometric Ratio
4.2. Soil C, N and P Nutrient Content and Stoichiometric Ratio
4.3. Microorganisms C, N and P Content and Stoichiometric Ratio
4.4. Plant–Soil–Microbial Stoichiometric Correlation Analysis
5. Conclusions
- (1)
- There were significant differences in C, N, P and the ecological stoichiometric characteristics of plants under different grassland utilization methods. Among the three treatments, the EG treatment had the highest plant C content, while the MG treatment had the lowest. The plant P of GG and MG was significantly higher than that of EG. The plant N content in GG was significantly higher than that in MG and EG. The ratio of plant N:P in the three treatments was higher than 20, and P deficiency and P limitation existed in the three treatments. The P limitation of EG was the most serious, and that of MG was the least.
- (2)
- There were some differences in soil nutrients and ecological stoichiometry among the three treatments. EG may be more beneficial to accumulate SOC and increase TP content. The C:N in EG was higher than that in GG and MG, and the decomposition rate of SOC in EG was slower, which was beneficial to the long-term maintenance of soil fertility. The C:P ratio of MG was the highest, and the net mineralization of P in MG was stronger than that of GG and EG. Soil N:P ratios under three different grassland-use patterns were all lower than 14, indicating that there was obvious N limitation.
- (3)
- There were some differences in soil microbial biomass under different grassland-utilization methods. The MBC of GG and MG was higher than that of EG, but the MBN of EG was between that of GG and MG, and the MBP of EG was the highest. The MBC:MBN under the three different grassland-utilization methods ranged from 2.48 to 3.88, which was lower than the global average range. The MBC:MBP also showed significant differences, with MG being the highest and EG the lowest. The MBN:MBP ratios of GG and MG were both higher than 9.6, indicating that they were P-limited, while the MBN:MBP of EG was lower than 8.9, indicating that it was N-limited.
- (4)
- Plant C and N were significantly correlated with soil C and N (p < 0.05). Plant P was significantly negatively correlated with soil P (p < 0.05), but MBP was significantly positively correlated with soil TP (p < 0.05). The results of MBC:MBP showed that soil microorganisms in GG and MG had a tendency to assimilate soil available phosphorus, and there was a tendency for microorganisms to compete with crops to absorb soil available phosphorus, which had a strong phosphorus fixation potential. Meanwhile, soil microorganisms in EG had a greater potential to release P from mineralized soil organic matter, and MBP could supplement soil available phosphorus pool.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Utilization Methods | C/(g/kg) | N/(g/kg) | P/(g/kg) | C:N | C:P | N:P |
---|---|---|---|---|---|---|
Grazing grassland | 429.56 ± 9.92 b | 21.47 ± 0.16 a | 0.81 ± 0.08 a | 20.01 ± 0.61 c | 531.74 ± 42.68 b | 26.61 ± 2.62 b |
Mowing grassland | 406.70 ± 5.25 c | 18.54 ± 0.13 bc | 0.87 ± 0.10 a | 21.93 ± 0.22 b | 474.63 ± 61.02 bc | 21.63 ± 2.67 bc |
Enclosed grassland | 472.45 ± 12.90 a | 19.79 ± 0.03 b | 0.42 ± 0.02 b | 23.88 ± 0.68 a | 1133.09 ± 40.40 a | 47.49 ± 2.38 a |
Utilization Methods | C/(g/kg) | N/(g/kg) | P/(g/kg) | C:N | C:P | N:P |
---|---|---|---|---|---|---|
Grazing grassland | 19.48 ± 1.12 ab | 2.19 ± 0.09 a | 0.85 ± 0.05 b | 8.91 ± 0.97 c | 22.78 ± 0.83 b | 2.58 ± 0.36 b |
Mowing grassland | 17.37 ± 0.42 b | 1.74 ± 0.10 bc | 0.53 ± 0.01 c | 10.04 ± 0.67 b | 32.88 ± 0.79 a | 3.29 ± 0.27 a |
Enclosed grassland | 22.45 ± 1.39 a | 1.83 ± 0.09 b | 1.26 ± 0.020 a | 12.31 ± 1.91 a | 17.91 ± 2.07 c | 1.46 ± 0.08 c |
Utilization Methods | MBC (mg/kg) | MBN (mg/kg) | MBP (mg/kg) | MBC:MBN | MBC:MBP | MBN:MBP |
---|---|---|---|---|---|---|
Grazing grassland | 350.24 ± 37.56 a | 142.46 ± 10.45 a | 10.95 ± 37.56 b | 2.48 ± 0.41 bc | 32.34 ± 5.93 b | 13.11 ± 1.81 a |
Mowing grassland | 315.61 ± 31.44 ab | 81.53 ± 7.23 c | 7.50 ± 0.20 c | 3.88 ± 0.32 a | 42.09 ± 3.98 a | 10.86 ± 0.71 a |
Enclosed grassland | 270.89 ± 11.44 b | 96.93 ± 10.14 b | 18.82 ± 0.65 a | 2.81 ± 0.19 b | 14.39 ± 0.20 c | 5.14 ± 0.37 b |
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Pan, G.; Song, S.; Wang, X.; Chi, Y. Using Ecological Stoichimetric Characteristies to Inform Grassland Management in the Karst Desertification Area. Agronomy 2023, 13, 1841. https://doi.org/10.3390/agronomy13071841
Pan G, Song S, Wang X, Chi Y. Using Ecological Stoichimetric Characteristies to Inform Grassland Management in the Karst Desertification Area. Agronomy. 2023; 13(7):1841. https://doi.org/10.3390/agronomy13071841
Chicago/Turabian StylePan, Guochang, Shuzhen Song, Xueling Wang, and Yongkuan Chi. 2023. "Using Ecological Stoichimetric Characteristies to Inform Grassland Management in the Karst Desertification Area" Agronomy 13, no. 7: 1841. https://doi.org/10.3390/agronomy13071841
APA StylePan, G., Song, S., Wang, X., & Chi, Y. (2023). Using Ecological Stoichimetric Characteristies to Inform Grassland Management in the Karst Desertification Area. Agronomy, 13(7), 1841. https://doi.org/10.3390/agronomy13071841