文章基本信息

标题：Microbial properties explain temporal variation in soil respiration in a grassland subjected to nitrogen addition
本地全文：下载
作者：Yue Li ; Yinghui Liu ; Shanmei Wu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2016
卷号：5
期号：1
DOI：10.1038/srep18496
语种：English
出版社：Springer Nature
摘要：The role of soil microbial variables in shaping the temporal variability of soil respiration has been well acknowledged but is poorly understood, particularly under elevated nitrogen (N) deposition conditions. We measured soil respiration along with soil microbial properties during the early, middle, and late growing seasons in temperate grassland plots that had been treated with N additions of 0, 2, 4, 8, 16, or 32 g N m⁻² yr⁻¹ for 10 years. Representing the averages over three observation periods, total (R_s) and heterotrophic (R_h) respiration were highest with 4 g N m⁻² yr⁻¹, but autotrophic respiration (R_a) was highest with 8 to 16 g N m⁻² yr⁻¹. Also, the responses of R_h and R_a were unsynchronized considering the periods separately. N addition had no significant impact on the temperature sensitivity ( Q ₁₀) for R_s but inhibited the Q ₁₀ for R_h. Significant interactions between observation period and N level occurred in soil respiration components, and the temporal variations in soil respiration components were mostly associated with changes in microbial biomass carbon (MBC) and phospholipid fatty acids (PLFAs). Further observation on soil organic carbon and root biomass is needed to reveal the long-term effect of N deposition on soil C sequestration.