Effects of Short-Term Nitrogen and Phosphorus Addition on Soil Respiration Components in a Subalpine Grassland of Qilian Mountains

被引：0
|
作者：
Jiang Y. [1 ]
Gan X.-L. [1 ]
Cao F.-F. [1 ]
Zhao C.-Y. [1 ]
Li W.-B. [1 ]
机构：
[1] State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, Ministry of Agriculture and Rural Affairs Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Education Engineering Research Center of Grassland Industry, College
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 04期
关键词：
autotrophic respiration rate; heterotrophic respiration rate; N addition; N and P mixed application; P addition; total soil respiration rate;
D O I：
10.13227/j.hjkx.202205177
中图分类号：
学科分类号：
摘要：
In order to investigate the effects of short-term nitrogen and phosphorus addition on soil respiration and its components in a subalpine grassland located on the Qilian Mountains, a random block design of nitrogen [10 g.(m2.a) - 1 , N], phosphorus [5 g.(m2.a) - 1 , P], nitrogen and phosphorus addition [10 g.(m2.a) - 1 N and 5 g.(m2.a) - 1 P, NP], the control (CK), and complete control (CK') was conducted from June to August 2019, and total soil respiration and its component respiration rates were measured. The results showed that nitrogen addition reduced soil total respiration and heterotrophic respiration rates at a lower rate than P addition [ - 16. 71% vs. -19. 20%; -4. 41% vs. -13. 05%], but the rate of decrease in autotrophic respiration was higher than that of P addition (-25. 03% vs. -23. 36%); N and P mixed application had no significant effect on soil total respiration rate. The total soil respiration rate and its components were significantly exponentially correlated with soil temperature, and the temperature sensitivity of soil respiration rate was decreased by nitrogen addition (Q10 : -5. 64%-0. 00%). P increased Q10 (3. 38%-6. 98%), and N and P reduced autotrophic respiration rate but increased heterotrophic respiration rate Q10 (16. 86%) and decreased total soil respiration rate Q10 (-2. 63%- -2. 02%). Soil pH, soil total nitrogen, and root phosphorus content were significantly correlated with autotrophic respiration rate (p <0. 05) but not with heterotrophic respiration rate, and root nitrogen content was significantly negatively correlated with heterotrophic respiration rate (p < 0. 05). In general, autotrophic respiration rate was more sensitive to N addition, whereas heterotrophic respiration rate was more sensitive to P addition. Both N and P addition significantly reduced soil total respiration rate, whereas N and P mixture did not significantly affect soil total respiration rate. These results can provide a scientific basis for the accurate assessment of soil carbon emission in subalpine grassland. © 2023 Science Press. All rights reserved.
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页码：2283 / 2292
页数：9
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