Long-Term Warming and Nitrogen Addition Have Contrasting Effects on Ecosystem Carbon Exchange in a Desert Steppe
- Qian WuQian WuKey Laboratory of Grassland Resources of the Ministry of Education, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture and Rural Affairs, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, ChinaMore by Qian Wu,
- Haiyan RenHaiyan RenKey Laboratory of Grassland Resources of the Ministry of Education, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture and Rural Affairs, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, ChinaMore by Haiyan Ren,
- Ton BisselingTon BisselingKey Laboratory of Grassland Resources of the Ministry of Education, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture and Rural Affairs, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, ChinaDepartment of Plant Sciences, Laboratory of Molecular Biology, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The NetherlandsMore by Ton Bisseling,
- Scott X. ChangScott X. ChangDepartment of Renewable Resources, University of Alberta, Edmonton, Alberta T6G 2E3, CanadaState Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, ChinaMore by Scott X. Chang,
- Zhen WangZhen WangInstitute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, ChinaMore by Zhen Wang,
- Yuanheng LiYuanheng LiInstitute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, ChinaMore by Yuanheng Li,
- Zhanlei PanZhanlei PanKey Laboratory of Grassland Resources of the Ministry of Education, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture and Rural Affairs, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, ChinaMore by Zhanlei Pan,
- Yinghao LiuYinghao LiuInstitute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, ChinaMore by Yinghao Liu,
- James F. Cahill JrJames F. Cahill, JrDepartment of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, CanadaMore by James F. Cahill, Jr,
- Xu ChengXu ChengDepartment of Plant Sciences, Laboratory of Molecular Biology, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The NetherlandsMore by Xu Cheng,
- Mengli ZhaoMengli ZhaoKey Laboratory of Grassland Resources of the Ministry of Education, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture and Rural Affairs, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, ChinaMore by Mengli Zhao,
- Zhongwu WangZhongwu WangKey Laboratory of Grassland Resources of the Ministry of Education, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture and Rural Affairs, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, ChinaMore by Zhongwu Wang,
- Zhiguo LiZhiguo LiKey Laboratory of Grassland Resources of the Ministry of Education, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture and Rural Affairs, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, ChinaMore by Zhiguo Li, and
- Guodong Han*Guodong Han*Email: [email protected]Key Laboratory of Grassland Resources of the Ministry of Education, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture and Rural Affairs, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, ChinaMore by Guodong Han
Abstract
Desert steppe, a unique ecotone between steppe and desert in Eurasia, is considered highly vulnerable to global change. However, the long-term impact of warming and nitrogen deposition on plant biomass production and ecosystem carbon exchange in a desert steppe remains unknown. A 12-year field experiment was conducted in a Stipa breviflora desert steppe in northern China. A split-design was used, with warming simulated by infrared radiators as the primary factor and N addition as the secondary factor. Our long-term experiment shows that warming did not change net ecosystem exchange (NEE) or total aboveground biomass (TAB) due to contrasting effects on C4 (23.4% increase) and C3 (11.4% decrease) plant biomass. However, nitrogen addition increased TAB by 9.3% and NEE by 26.0% by increasing soil available N content. Thus, the studied desert steppe did not switch from a carbon sink to a carbon source in response to global change and positively responded to nitrogen deposition. Our study indicates that the desert steppe may be resilient to long-term warming by regulating plant species with contrasting photosynthetic types and that nitrogen deposition could increase plant growth and carbon sequestration, providing negative feedback on climate change.
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