Designing a regional nitrogen cycle module of grassland for the IAP-N model |
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Authors: | Jin Yue Shenghui Han Xunhua Zheng |
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Institution: | State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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Abstract: | Assessment of the nitrogen (N) balance and its long-term trend is
necessary for management practices because of the negative environmental
effects caused by an imbalance of reactive N in grassland ecosystems. In this
study, we designed a module for the IAP-N (Improving Anthropogenic Practices of
managing reactive Nitrogen) model to enable it to assess the N budget of
regional grasslands. The module was developed to quantify the individual
components of the N inputs and outputs for grassland ecosystems using livestock
and human populations, grassland area, and fossil-energy consumption data as
the model inputs. In this paper, the estimation approaches for individual
components of N budget, data acquisition, and parameter selection are described
in detail. The model was applied to assess the N budget of Inner Mongolia in
2006 at the county scale. The simulation results show that the most important
pathway of N outputs from the grassland was livestock intake. The N output from
livestock intake was especially large in the middle of Inner Mongolia.
Biological fixation, atmospheric deposition, and livestock excreta deposition
were comparably important for the N inputs into the grassland. The N budget for
Inner Mongolia grassland in 2006 was -1.7×108±0.6×108 kg. The case study for Inner Mongolia shows that the new grassland
module for the IAP-N model can capture the characteristics of the N budget in a
semiarid grassland. |
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Keywords: | nitrogen budget grassland module example simulation |
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