Nitrogen is an important factor limiting the productivity of terrestrial ecosystems. We used the method of spatiotemporal substitution and Pinus massoniana woodlands with different restoration history lengths as the research subject.In order to understand the effects of Dicranopteris dichotoma on nitrogen fixation during the vegetation restoration process,we measured the stable isotope 15 N,the nitrogen content of different components,and the ratios of different components of nitrogen to total nitrogen in t...
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