Abstract:An increase in foliar nitrogen isotope composition (δN) with decreasing precipitation has been shown to occur widely in non-N-fixing plant species. However, similar patterns have not been identified in N-fixing species. Here, we tested the relationships of foliar δN with local environmental factors and leaf properties in two leguminous shrub species ( and ) sampled from 30 populations. Results indicated that the mean annual precipitation (MAP) primarily accounted for the variation of foliar δN in the two speci… Show more
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