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The increase of atmosphericCO2 caused by human activities has become an important scientific topic and has attracted widespread political and social attention
.
The Paris Agreement and the IPCC report both point to effectively curbing the increase of atmosphericCO2 as one of the effective measures to mitigate climate change, while emphasizing the need for a deeper understanding of atmospheric carbon sources and sinks
.
Soils are the largest carbon reservoir of terrestrial ecosystems, with at least half of their soil organic carbon stored in
forests.
Tropical and subtropical forests dominate the global forest carbon cycle, accounting for 78% of total carbon emissions and 55% of total carbon absorption
in global forests.
Human activities have also led to increased
atmospheric nitrogen deposition.
Nitrogen deposition changes forest soil respiration and carbon emissions by affecting plant growth and microbial activity, but the current academic understanding of how nitrogen deposition affects forest soil respiration mainly comes from short-time scale research
.
Since nitrogen deposition is a long-term ecological and environmental process, the pattern and mechanism
of nitrogen deposition regulating forest soil carbon emissions cannot be accurately understood without long-term and continuous research.
The ecosystem management research team of South China Botanical Garden of the Chinese Academy of Sciences (PI: Associate Professor Zheng Mianhai) relied on the earliest research platform for simulated forest nitrogen deposition in China and found that the impact of long-term nitrogen deposition on soil carbon emissions in tropical forests in South Asia showed phased changes
.
The research platform is located in Dinghushan National Nature Reserve of Guangdong Province, and includes three typical forest types: monsoon evergreen broad-leaved forest, mixed coniferous and broad-leaved forest and Pinus massoniana coniferous forest
.
After 9-13 years of long-term nitrogen addition treatment, forest soil respiration showed "no significant change-significant decrease-no significant change" of the three-stage pattern (Figure 1).
Compared with low and medium nitrogen treatment, high nitrogen treatment shortens the time
of the three-stage pattern.
During the whole experimental process, the total cumulative reduction of soil CO2 emissions by nitrogen addition was 6.
53-9.
06 mg CO2 ha-1, and nitrogen addition reduced soil CO2 The efficiency of emissions is 5.
80-13.
13 mgCO2mg N-1
.
Based on 849 carbon-nitrogen cycle data from soil, plant and microbial simulated nitrogen deposition samples in Dinghu Mountain, the research team also constructed a mechanism framework for nitrogen deposition to regulate soil carbon emissions in tropical forests (Figure 2).
These results suggest that many short-term nitrogen addition experiments in the past do not accurately reflect the pattern
of forest soil respiration in response to nitrogen deposition.
The research results provide important evidence for nitrogen deposition to promote soil carbon sequestration in tropical forests, and also provide a new basis
for global climate change prediction and the realization of ecosystem carbon neutrality.
The results were published on December 1, 2022 in Nature Geosciences, the top international geoscience journal (IF=21.
53).
(Link: style="font-size: 12pt; font-family: ; line-height: 150%; mso-fareast-theme-font: major-fareast; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"" _istranslated="1">) After the article was published, December 5 The daily journal was again reported in the form of Research Briefing.
。 Associate Professor Zheng Miaohai of the South China Botanical Garden of the Chinese Academy of Sciences is the first author of the paper, and Associate Professor Zhang Wei and Professor Mo Jiangming are the co-corresponding authors
of the paper.
In addition, Prof.
Xiankai Lu, Associate Prof.
Juan Huang, Assistant Prof.
Qinggong Mao, Dr.
Senhao Wang, Prof.
Yiqi Luo of Cornell University, Prof.
Qing Ye and Prof.
Juxiu Liu of South China Botanical Garden, and Dr.
Tao Zhang of Lingnan Normal University also participated in the work
.
The research results have been supported
by the National Natural Science Foundation of China, the General Project, the Youth Promotion Association of the Chinese Academy of Sciences, and the Young Talents Sponsorship Project of the Ecological Society of China.
Figure 1.
Effects of long-term nitrogen addition on soil carbon emissions in Dinghu Mountain forest
Figure 2.
A mechanism framework for long-term nitrogen deposition to regulate soil carbon emissions in tropical forests
Figure 3.
Phased changes in soil respiration in tropical forests under nitrogen deposition (Research Briefing)
