Threshold responses of soil gross nitrogen transformation rates to aridity gradient
文献类型：期刊论文
| 作者 | Song, Lei2; Wang, Jinsong2; Zhang, Ruiyang2; Pan, Junxiao; Li, Yang; Wang, Song2; Niu, Shuli1,2 |
| 刊名 | GLOBAL CHANGE BIOLOGY
 |
| 出版日期 | 2023 |
| ISSN号 | 1354-1013 |
| 关键词 | N-15 labeling drought nitrogen cycling Qinghai-Tibet plateau soil depth |
| DOI | 10.1111/gcb.16737 |
| 文献子类 | Article ; Early Access |
| 英文摘要 | The responses of soil nitrogen (N) transformations to climate change are crucial for biome productivity prediction under global change. However, little is known about the responses of soil gross N transformation rates to drought gradient. Along an aridity gradient across the 2700 km transect of drylands on the Qinghai-Tibetan Plateau, this study measured three main soil gross N transformation rates in both topsoil (0-10 cm) and subsoil (20-30 cm) using the laboratorial N-15 labeling. The relevant soil abiotic and biotic variables were also determined. The results showed that gross N mineralization and nitrification rates steeply decreased with increasing aridity when aridity was less than 0.5 but just slightly decreased with increasing aridity when aridity was larger than 0.5 at both soil layers. In topsoil, the decreases of the two gross rates were accompanied by the similar decreased patterns of soil total N content and microbial biomass carbon with increasing aridity (p < .05). In subsoil, although the decreased pattern of soil total N with increasing aridity was still similar to the decreases of the two gross rates (p < .05), microbial biomass carbon did not change (p > .05). Instead, bacteria and ammonia oxidizing archaea abundances decreased with increasing aridity when aridity was larger than 0.5 (p < .05). With an aridity threshold of 0.6, gross N immobilization rate increased with increasing aridity in wetter region (aridity < 0.6) accompanied with an increased bacteria/fungi ratio, but decreased with increasing aridity in drier region (aridity > 0.6) where mineral N and microbial biomass N also decreased at both soil layers (p < .05). This study provided new insight to understand the differential responses of soil N transformation to drought gradient. The threshold responses of the gross N transformation rates to aridity gradient should be noted in biogeochemical models to better predict N cycling and manage land in the context of global change. |
| 学科主题 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| WOS关键词 | MINERALIZATION ; NITRIFICATION ; FOREST ; IMMOBILIZATION ; DIVERSITY ; PATTERNS ; FLUXES ; DEPTH |
| 语种 | 英语 |
| 出版者 | WILEY |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/193435]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Synth Res Ctr Chinese Ecosyst Res Network, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song, Lei,Wang, Jinsong,Zhang, Ruiyang,et al. Threshold responses of soil gross nitrogen transformation rates to aridity gradient[J]. GLOBAL CHANGE BIOLOGY,2023. |
| APA | Song, Lei.,Wang, Jinsong.,Zhang, Ruiyang.,Pan, Junxiao.,Li, Yang.,...&Niu, Shuli.(2023).Threshold responses of soil gross nitrogen transformation rates to aridity gradient.GLOBAL CHANGE BIOLOGY. |
| MLA | Song, Lei,et al."Threshold responses of soil gross nitrogen transformation rates to aridity gradient".GLOBAL CHANGE BIOLOGY (2023). |
入库方式： OAI收割
来源：地理科学与资源研究所
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