NDLI: Importance of point sources on regional nitrous oxide fluxes in semi-arid steppe of Inner Mongolia, China

Content Provider	Springer Nature Link
Author	Holst, J. Liu, C. Yao, Z. Brüggemann, N. Zheng, X. Han, X. Butterbach Bahl, K.
Copyright Year	2007
Abstract	The aim of the present work was to estimate the contribution of different point and diffuse sources to the regional N$_{2}$O emission strength of steppe in the Xilin river catchment, Inner Mongolia, People’s Republic of China. Transect studies showed that the topographic effect on N$_{2}$O emissions from upland soils was negligible and that upland steppe is only a very weak net source of N$_{2}$O during the growing season (0.8 ± 0.4 μg N$_{2}$O–N m$^{−2}$ h$^{−1}$). Slightly higher emissions were found for riparian areas (1.8 ± 0.3 μg N$_{2}$O–N m$^{−2}$ h$^{−1}$), which cover ∼4% of the landscape. Even faeces or urine additions stimulated N$_{2}$O emissions from steppe soils only weakly (<2.5 μg N$_{2}$O–N m$^{−2}$ h$^{−1}$ for a 5 days period). Due to low moisture contents, N$_{2}$O emissions from dung heaps were also rather low (6.2 ± 0.8 μg N$_{2}$O–N kg$^{−1}$ dry matter h$^{−1}$). In contrast, three orders of magnitude higher N$_{2}$O emissions were found at sheepfolds (2.45 mg N$_{2}$O–N m$^{−2}$ h$^{−1}$ on average). By calculating N$_{2}$O emissions on a landscape scale, we show that point sources, and especially sheepfolds, become the dominating regional N$_{2}$O source during the growing season if stocking rates are >1 sheep ha$^{−1}$. Our results indicate that the common grazing management in the Xilin river region leads to a translocation of nitrogen from large source areas towards defined spots. This finding is further supported by measurements of NH$_{3}$ concentrations at different sites. Since most of the nitrogen accumulated in these hot spots is finally lost through burning of the dried excrements by the farmers for heating and cooking purposes, the ecosystem faces a significant human perturbation of regional N cycling, which may contribute to an accelerated degradation of steppe in the Xilin river region.
Starting Page	209
Ending Page	226
Page Count	18
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	296
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-06-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrous oxide Ammonia Semi-arid grasslands Sheepfold Dung heap Urine patch Dung patch MAGIM Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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