Decoupling of greenness and gross primary productivity as aridity decreases
文献类型：期刊论文
| 作者 | Hu, Zhongmin2,3,4; Piao, Shilong5,6; Knapp, Alan K.1,7; Wang, Xuhui5,6; Peng, Shushi5,6; Yuan, Wenping4,8; Running, Steve9; Mao, Jiafu10,11; Shi, Xiaoying10,11; Ciais, Philippe12 |
| 刊名 | REMOTE SENSING OF ENVIRONMENT
 |
| 出版日期 | 2022-09-15 |
| 卷号 | 279页码:10 |
| ISSN号 | 0034-4257 |
| 关键词 | Gross primary productivity Greenness Leaf area index Inter-annual variability Land models Light-use efficiency |
| DOI | 10.1016/j.rse.2022.113120 |
| 通讯作者 | Hu, Zhongmin(huzm@igsnrr.ac.cn) |
| 英文摘要 | Ecosystem primary productivity is a key ecological process influencing many ecosystem services, including carbon storage. Thus, clarifying how primary productivity in terrestrial ecosystems responds to climatic variability can reveal key mechanisms that will drive future changes in the global carbon budget. Satellite products of canopy greenness are widely used as proxies for vegetation productivity to evaluate how ecosystems respond to climate variability. However, to what degree inter-annual variations in productivity are consistent with greenness and how this relationship varies spatially remains unclear. Here we investigated the strength of the coupling between inter-annual variations in leaf area index (LAI, a measure of greenness) and ecosystem gross primary productivity (GPP) derived from eddy covariance towers, i.e., the r(2) of the LAI-GPP relationship. Overall, inter-annual GPP and LAI were highly coupled (i.e., high r(2)) in arid grasslands, but were fully decoupled in mesic evergreen broadleaf forests, indicating that this relationship varies strongly along aridity gradients. A possible mechanism of the spatial variation in the LAI-GPP relationship is that the tradeoff between ecosystem structure (LAI) and physiology (photosynthesis per unit leaf area) becomes stronger in more humid climates. Land models overestimated the r(2) of LAI-GPP correlation for most ecosystem types and failed to capture the spatial pattern along aridity gradients. We conclude that relying on greenness products for evaluating inter-annual changes in vegetation productivity may bias assessments, especially in tropical rainforest ecosystems. Our findings may also reconcile observed disparities between responses in greenness and GPP during drought in Amazon forests. |
| WOS关键词 | VARIABILITY ; DROUGHT ; CO2 ; SENSITIVITY ; DYNAMICS ; PROGRAM ; FLUXES ; FOREST |
| 资助项目 | National Natural Science Foundation of China[31922053] ; National Key Research and Development Program of China[2017YFA0604801] ; Second Tibetan Plateau Scientific Expedition and Research Program[2019QZKK0405] ; Hainan University[KYQD(ZR)21096] ; NASA ROSES Grant[NNX10AG01A] ; NASA ROSES Grant[NNH10AN681] ; CDIAC ; ICOS Ecosystem Thematic Center ; OzFlux office ; ChinaFlux office ; AsiaFlux office |
| WOS研究方向 | Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE INC |
| WOS记录号 | WOS:000841460500001 |
| 资助机构 | National Natural Science Foundation of China ; National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Hainan University ; NASA ROSES Grant ; CDIAC ; ICOS Ecosystem Thematic Center ; OzFlux office ; ChinaFlux office ; AsiaFlux office |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/166574]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Hu, Zhongmin |
| 作者单位 | 1.Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA 2.South China Normal Univ, Sch Geog, Shipai Campus, Guangzhou 510631, Peoples R China 3.Hainan Univ, Key Lab Agroforestry Environm Proc & Ecol Regulat, Haikou 570228, Hainan, Peoples R China 4.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Guangdong, Peoples R China 5.Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China 6.Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China 7.Colorado State Univ, Grad Degree Program Ecol, Ft Collins, CO 80523 USA 8.Sun Yat Sen Univ, Sch Atmospher Sci, Guangzhou 519082, Peoples R China 9.Univ Montana, Coll Forestry & Conservat, NTSG, Missoula, MT 59812 USA 10.Oak Ridge Natl Lab, Climate Change Sci Inst, Oak Ridge, TN 37831 USA |
| 推荐引用方式 GB/T 7714 | Hu, Zhongmin,Piao, Shilong,Knapp, Alan K.,et al. Decoupling of greenness and gross primary productivity as aridity decreases[J]. REMOTE SENSING OF ENVIRONMENT,2022,279:10. |
| APA | Hu, Zhongmin.,Piao, Shilong.,Knapp, Alan K..,Wang, Xuhui.,Peng, Shushi.,...&Yu, Guirui.(2022).Decoupling of greenness and gross primary productivity as aridity decreases.REMOTE SENSING OF ENVIRONMENT,279,10. |
| MLA | Hu, Zhongmin,et al."Decoupling of greenness and gross primary productivity as aridity decreases".REMOTE SENSING OF ENVIRONMENT 279(2022):10. |
入库方式： OAI收割
来源：地理科学与资源研究所
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