Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation.

3.4 Relationships of N concentration with N fixation and N resorption The soil N concentration showed a decreasing trend from east to west, and the N concentration was significantly higher in the alpine meadow than in the other three alpine ecosystems (Table 1 , p < .05).

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However, N resorption efficiency in the alpine species displayed an increasing trend along with a decline in soil nutrients and precipitation from east to west on the Changtang Plateau, which supports our second hypothesis.

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The NRE in both the legume and the nonlegume species was negatively correlated with precipitation, while the biological N fixation of the legume species displayed a positive trend along the precipitation gradient on the Changtang Plateau.

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