关键词: 土壤线虫, 长期施肥, 无机肥, 旱地红壤, 土壤质量

Abstract: Understanding the effects of simulated N deposition on temperature sensitivity of soil respiration (Q₁₀) can reduce the uncertainty in the assessment of soil carbon budget under global change scenarios. In this study, 60 literatures on the effects of simulated N deposition on Q₁₀ in China’s terrestrial ecosystems were investigated by meta analysis. The results showed that the effects of simulated N deposition on Q₁₀ were not significant (0.49%). Nitrogen deposition had negative effects on Q₁₀ in the plateau climate zone (16.32%) and positive effects on that in marsh (38.19%). The effect size was related to the dosage of simulated N deposition. When simulated N deposition dosage was less than 50 kg·hm^-2·a^-1, Q₁₀increased by 2.59%; when the dosage was 50-150 kg·hm^-2·a^-1 and greater than 150 kg·hm^-2·a^-1, Q₁₀ decreased by 4.33% and 1.61%, respectively. The deposited nitrate nitrogen significantly increased Q₁₀ (34.33%), while urea application significantly decreased Q₁₀ (8.11%). Moreover, simulated N deposition with a duration over 15 months significantly reduced Q₁₀ (19.24%). The alteration of Q₁₀ by simulated N deposition may be due to the alteration of the metabolism of roots and soil microbes.  

Key words: soil nematodes, long-term fertilization, inorganic fertilizer, upland red soil, soil quality.