Fig. 10.2 The effects of N addition rate and frequencies on gene copy numbers of functional genes
involved in major steps of the nitrogen cycle (nifH, chiA, AOA-amoA, AOB-amoA, narG, nirK,
nirS, and nosZ) in a temperate steppe. Significant polynomial quadratic regression coefficients of
the best-fitting models are reported as p < 0.05Ã, p < 0.01ÃÃ, and p < 0.001ÃÃÃ. NS indicates
nonsignificant ( p > 0.05). (This figure was adapted from Ning et al. (2015) with permission by
Springer Nature)
10 Impacts of Nitrogen Deposition on China’s Grassland Ecosystems
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involved in major steps of the nitrogen cycle (nifH, chiA, AOA-amoA, AOB-amoA, narG, nirK,
nirS, and nosZ) in a temperate steppe. Significant polynomial quadratic regression coefficients of
the best-fitting models are reported as p < 0.05Ã, p < 0.01ÃÃ, and p < 0.001ÃÃÃ. NS indicates
nonsignificant ( p > 0.05). (This figure was adapted from Ning et al. (2015) with permission by
Springer Nature)
10 Impacts of Nitrogen Deposition on China’s Grassland Ecosystems
223