文献类型：期刊文献

英文题名：Different Response Patterns of Soil Respiration to a Nitrogen Addition Gradient in Four Types of Land-Use on an Alluvial Island in China

作者：Zhai, Deping[1] Jin, Wanyu[3] Shao, Junjiong[1,2] He, Yanghui[3] Zhang, Guodong[3] Li, Ming[3] Huang, Hui[4,5] Zhou, Xuhui[1,2]

第一作者：Zhai, Deping

通信作者：Zhou, XH[1];Zhou, XH[2];Huang, H[3];Huang, H[4]

机构：[1]East China Normal Univ, Sch Ecol & Environm Sci, State Key Lab Estuarine & Coastal Res, 500 Dongchuan Rd, Shanghai 200241, Peoples R China;[2]East China Normal Univ, Ctr Global Change & Ecol Forecasting, Shanghai 200241, Peoples R China;[3]Fudan Univ, Minist Educ, Coastal Ecosyst Res Stn Yangtze River Estuary, Inst Biodivers Sci,Key Lab Biodivers Sci & Ecol E, 220 Handan Rd, Shanghai 200433, Peoples R China;[4]Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China;[5]Nanjing Forestry Univ, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Jiangsu, Peoples R China

年份：2017

卷号：20

期号：5

起止页码：904-916

外文期刊名：ECOSYSTEMS

收录：;Scopus(收录号：2-s2.0-85001052620);WOS:【SCI-EXPANDED(收录号:WOS:000407846100004)】；

基金：We are grateful to two anonymous reviewers for their valuable comments and suggestions. This research was financially supported by the National Natural Science Foundation of China (Grant No. 31370489), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, and the "Thousand Young Talents" Program in China.

语种：英文

外文关键词：carbon cycle; climate change; heterotrophic respiration; land-use types; nitrogen addition; soil respiration

摘要：It has been well documented that nitrogen (N) additions significantly affect soil respiration (R (s)) and its components [that is, autotrophic (R (a)) and heterotrophic respiration (R (h))] in terrestrial ecosystems. These N-induced effects largely result from changes in plant growth, soil properties (for example, pH), and/ or microbial community. However, how R (s) and its components respond to N addition gradients from low to high fertilizer application rates and what the differences are in diverse land-use types remain unclear. In our study, a field experiment was conducted to examine response patterns of R (s) to a N addition gradient at four levels (0, 15, 30, and 45 g N m(-2) y(-1)) in four types of land-use (paddy rice-wheat and maize-wheat croplands, an abandoned field grassland, and a Metasequoia plantation) from December 2012 to September 2014 in eastern China. Our results showed that N addition significantly stimulated R (s) in all four land-use types and R (h) in croplands (paddy rice-wheat and maize-wheat). R (s) increased linearly with N addition rates in croplands and the plantation, whereas in grassland, it exhibited a parabolic response to N addition rates with the highest values at the moderate N level in spite of the homogeneous matrix for all four land-use types. This suggested higher response thresholds of R (s) to the N addition gradient in croplands and the plantation. During the wheat-growing season in the two croplands, R (h) also displayed linear increases with rising N addition rates. Interestingly, N addition significantly decreased the apparent temperature sensitivity of R (s) and increased basal R (s). The different response patterns of R (s) to the N addition gradient in diverse land-use types with a similar soil matrix indicate that vegetation type is very important in regulating terrestrial C cycle feedback to climate change under N deposition.