We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
模拟增温对青藏高原东部高寒灌丛 土壤氮转化的影响.
- Authors
刘美; 马志良
- Abstract
We investigated the effects of warming on soil nitrogen cycling process in alpine scrub ecosystem, with an in-situ simulated warming experiment at Sibiraea angustata alpine scrubland on the eastern Qinghai-Tibet Plateau, China. We examined the responses of soil nitrogen transformation rate to warming in three critical periods (the early, late, and non-growing seasons). The results showed that warming increased soil temperature by 1.2 °C but decreased soil moisture by 2.5%. The soil net nitrogen mineralization rates (i. e., ammonification and nitrification) in the growing season were significantly higher than those in the non-growing season. The rates of soil net nitrogen fixation in the non-growing season were significantly higher than that in the growing season. Soil nitrification was the major process of soil nitrogen transformation in the early growing season, while soil ammonification was the major one in the late growing season and non-growing season. The effects of experimental warming on soil nitrogen transformation differed among those three periods. Experimental warming significantly increased soil net ammonification, nitrification, nitrogen mine-ralization and fixation in the early growing season, and enhanced soil net nitrification and nitrogen mineralization in the non-growing season. However, warming significantly decreased soil net nitrification, nitrogen mineralization and fixation in the late growing season and soil net ammonification in the non-growing season. Moreover, warming did not affect soil net nitrogen fixation rates in the non-growing season and soil net nitrification rates in the late growing season. Future climate warming would significantly change soil nitrogen transformation by accelerating soil nitrogen cycling in the alpine scrub ecosystem on the eastern Qinghai-Tibet Plateau.
- Subjects
CHINA; NITROGEN fixation; MOUNTAIN ecology; GROWING season; NITROGEN cycle; NITROGEN in soils; TUNDRAS
- Publication
Yingyong Shengtai Xuebao, 2021, Vol 32, Issue 6, p2045
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202106.007