14 / 29
Page 110
Notes:
conferenceseries
.com
Volume 8, Issue 10 (Suppl)
J Earth Sci Clim Change, an open access
ISSN: 2157-7617
Climate Change 2017
October 19-21, 2017
CLIMATE CHANGE
October 19-21, 2017 | Rome, Italy
4
th
World Conference on
Nitrogen recovery of temperate desert ecosystem enhanced with precipitation and nitrogen deposition
increase
Xiaoqing Cui
1
, Ping Yue
2
and
Xuejun Liu
1
1
China Agricultural University, China
2
Chinese Academy of Sciences, China
Arid regions have been undergoing global climate change and widespread reactive nitrogen (N) deposition. And N retention
as a critical ecosystem function, our understanding about its response to climate and N deposition change is limited especially
in the desert ecosystem. Here, we use double-labeled
15
NH
4
15
NO
3
fertilizer (30 and 60 kg N ha
-1
yr
-1
) to tracer N fate and N
residual under ambient (no water addition) and enhanced precipitation (60 mm water addition) condition in a temperate
desert ecosystem in Northwest China. The N retention of plants showed a significantly different response to water and nitrogen
addition between years. Soil as the largest pool of N retention, N addition significantly enhanced the N retention of topsoil
layer. The whole ecosystem recovery significantly differed between years, in the dry year it was less than 10% and in the wet
year, it reached 75% averagely. What’s important, the residual N can be up taken by plants when precipitation was enough next
year. The two-year accumulated ecosystem recovery could be raised up to 58%. The whole ecosystem recovery significantly
enhanced with water addition and had no significant relationship with water addition. So, in future climate and nitrogen
deposition change scenario, the plant-soil ecosystem recovery will significantly increase in the temperate desert.
Biography
Xiaoqing Cui has majors in Plant Nutrition and Ecology. She has good expertise in evaluating the ecological impact of climate and nitrogen deposition on desert
ecosystem. She has quantified nitrogen fate in a
Haloxylon ammodendron
dominated desert ecosystem. This is of significant importance in evaluating the nitrogen
fluxes in arid desert ecosystem under future climate and anthropogenic activity, which is useful for updating nitrogen cycle model in arid regions.
cuixq111@163.comXiaoqing Cui et al., J Earth Sci Clim Change 2017, 8:10(Suppl)
DOI: 10.4172/2157-7617-C1-037