期刊
CATENA
卷 76, 期 1, 页码 63-69出版社
ELSEVIER
DOI: 10.1016/j.catena.2008.09.007
关键词
Baseflow; Coniferous forest; Headwater; Nitrogen; N saturation indicator; Watershed
资金
- Japan Science and Technology Agency
- Core Research for Evolutional Science and Technology
- National Natural Science Foundation of China [40535024]
Understanding the seasonal and regional patterns of nitrogen (N) components in the headwaters of forested watersheds is important for forests management. Here, we investigated the NO3-N concentration and its seasonal variations in the baseflow headwaters in Japanese coniferous forests with different N saturation status in five regions (i.e., Nagano, Tokyo, Aichi; Kochi and Mie). We found that the ratios of NO3-N to DON were significantly higher in the N-saturated regions including Nagano (14.1 +/- 2.2) and Tokyo (16.5 +/- 4.1), compared with the regions, which didn't experience N saturation including Aichi (1.4 +/- 0.2), Kochi (5.1 +/- 1.8), and Mie (2.2 +/- 0.5). In comparison with the regions without experiencing N saturation, the relatively higher NO3-N concentration, as well as its contrastive variation between growing season and dormant season, was also characteristic of the seasonal NO3-N concentration in the N-saturated regions. Our findings have indicated that NO3-N concentration, its seasonal variations, and the ratio of NO3-N to DON, are the better and applicable indicators for evaluating N saturation status in Japanese coniferous forests. (C) 2008 Elsevier B.V. All rights reserved
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