Exogenous and endogenous nitrogen differentially affect the decomposition of fine roots of different diameter classes of Mongolian pine in semi-arid northeast China
文献类型：期刊论文
| 作者 | Gang, Qun1,2,3; Chang, Scott X.3; Lin, Guigang1; Zhao, Qiong1; Mao, Bing1; Zeng, De-Hui1 |
| 刊名 | PLANT AND SOIL
 |
| 出版日期 | 2019-03-01 |
| 卷号 | 436期号:1-2页码:109-122 |
| ISSN号 | 0032-079X |
| 关键词 | Decomposition Nitrogen addition Fine root Root diameter class Pinus sylvestris var mongolica |
| DOI | 10.1007/s11104-018-03910-0 |
| 英文摘要 | AimsNitrogen (N) addition could affect litter decomposition through its direct effects on soil N availability and indirect effects on initial litter chemistry. The aim of this study was to evaluate the relative contribution of these direct and indirect effects to the decomposition of fine roots with different diameter classes.MethodsA two-year reciprocal replant-transplant field experiment was conducted in a Mongolian pine (Pinus sylvestris var. mongolica) plantation to examine the relative effect of exogenous and endogenous N enrichment induced by N addition (10gNm(-2)yr.(-1)) on the decomposition of fine roots with different diameter classes: < 0.5mm (small fine root, SFR) and 0.5-2mm (large fine root, LFR).ResultsThe LFR had significantly higher decomposition rates (k: 0.315-0.397yr.(-1)) than the SFR (0.245-0.274yr.(-1)) after 2years of incubation. Exogenous N (i.e., increased soil N availability due to N addition) had no significant effect on the decomposition rates of fine roots, whereas endogenous N (i.e. increased N concentration in litter due to N addition) inhibited and accelerated the decomposition of SFR and LFR, respectively. Endogenous N decreased the net release of N but both endogenous and exogenous N increased the net release of phosphorus (P) from SFR. By contrast, exogenous and endogenous N decreased the net release of N and P from LFR.ConclusionsOur results suggest that N addition affected fine root decomposition indirectly by changing the chemical traits of fine roots rather than directly through changing soil N availability. Elevated input and decreased net N release of fine roots might be a potential mechanism explaining the increases of total organic carbon and total N in the semi-arid forest soil under N addition. Our study also suggests that SFR may be a more important source of stable soil organic matter relative to LFR. |
| 资助项目 | National Natural Science Foundation of China[31870603] ; National Natural Science Foundation of China[41877341] ; CAS Key Laboratory of Forest Ecology and Management |
| WOS研究方向 | Agriculture ; Plant Sciences |
| 语种 | 英语 |
| 出版者 | SPRINGER |
| WOS记录号 | WOS:000462031100007 |
| 源URL | [http://210.72.129.5/handle/321005/123981]  |
| 专题 | 中国科学院沈阳应用生态研究所 |
| 通讯作者 | Zeng, De-Hui |
| 作者单位 | 1.Chinese Acad Sci, CAS Key Lab Forest Ecol & Management, Daqinggou Ecol Stn, Inst Appl Ecol, Shenyang 110016, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2E3, Canada |
| 推荐引用方式 GB/T 7714 | Gang, Qun,Chang, Scott X.,Lin, Guigang,et al. Exogenous and endogenous nitrogen differentially affect the decomposition of fine roots of different diameter classes of Mongolian pine in semi-arid northeast China[J]. PLANT AND SOIL,2019,436(1-2):109-122. |
| APA | Gang, Qun,Chang, Scott X.,Lin, Guigang,Zhao, Qiong,Mao, Bing,&Zeng, De-Hui.(2019).Exogenous and endogenous nitrogen differentially affect the decomposition of fine roots of different diameter classes of Mongolian pine in semi-arid northeast China.PLANT AND SOIL,436(1-2),109-122. |
| MLA | Gang, Qun,et al."Exogenous and endogenous nitrogen differentially affect the decomposition of fine roots of different diameter classes of Mongolian pine in semi-arid northeast China".PLANT AND SOIL 436.1-2(2019):109-122. |
入库方式： OAI收割
来源：沈阳应用生态研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。