Altitudinal variations of the rate and temperature sensitivity of soil nitrogen mineralization on the Qinghai-Tibetan Plateau

Author:

Hou Xikang1,Kou Dan2,Hirota Mitsuru3,Guo Tong4,Lang Tao5

Affiliation:

1. State Key Laboratory of Environment Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences , Beijing 100012 , China

2. Biogeochemistry Research Group, Department of Biological and Environmental Sciences, University of Eastern Finland , Kuopio 70210 , Finland

3. Graduate School of Life and Environmental Sciences, University of Tsukuba , Tsukuba, Ibaraki , Japan

4. Institute of Ecology, College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes of Ministry of Education, Peking University , Beijing 100871 , China

5. MNR Key Laboratory for Geo-Environmental Monitoring of Great Bay Area & Shenzhen Key Laboratory of Marine Bio-resource and Eco-environmental Science, College of Life Sciences and Oceanography, Shenzhen University , Shenzhen 518071 , China

Abstract

Abstract Changes in soil nitrogen mineralization can impact nutrient availability, and further affect plant growth. It is unclear, however, how temperature elevation in alpine grassland will affect soil net N mineralization rate (Nmin) across altitudes. At six altitudes (3200–4200 m with an interval of 200 m) along a slope in Lenglong mountain in the northern Qinghai-Tibetan Plateau, we performed an in situ soil incubation experiment by using the resin-core method to assess altitudinal variations of Nmin. Meanwhile, we evaluated the effects of temperature elevation on Nmin and its temperature sensitivity (Q10) through a soil downward transplantation experiment based on three reference baseline altitudes (3800, 4000 and 4200 m). The results showed that high altitudes generally led to low values of Nmin. Structural equation modeling analysis revealed that Nmin along the altitude was mainly controlled by soil temperature. Increased temperature caused by the altitude transplantation significantly elevated Nmin for all of the three reference altitudes. The value of Q10 was 3.4 for soil samples transplanted from the reference altitude of 4200 m, which was about twice that of the lower reference altitudes of 4000 and 3800 m.

Funder

Second Tibetan Plateau Scientific Expedition and Research

National Natural Science Foundation of China

Postdoctoral Science Foundation of China

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics

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