Impacts of nitrogen addition on plant phosphorus content in forest ecosystems and the underlying mechanisms

doi:10.17521/cjpe.2018.0240

Abstract

Abstract:

Nitrogen (N) deposition has profound impacts on the phosphorus (P) cycling in forest ecosystems. Especially, the aggravated P limitation on tree growth under N addition has caused much attention to researchers. This article reviews the effects of N addition on plant P content in forest ecosystems. The result showed that N addition increased soil available P and facilitated the absorption of P by plants by promoting soil phosphatase activity, thereby increasing plant P content. Furthermore, changes in tree P content following N addition were also affected by species, life forms as well as experimental duration. Due to the inconsistency, the underlying mechanisms of changes in P content under N addition were further summarized as follows: 1) changes in soil available P content induced by exogenous N input affected the source of plant P; 2) N input affected the P uptake capacity of plants by affecting plant root exudates, mycorrhizal symbiosis and root morphological structure; 3) plant P utilization efficiency was also influenced with changes of P re-distribution and P re-absorption. Overall, for the changes in plant P under increasing exogenous N inputs, alterations of soil available P under N addition was the primary factor, while changes in plant P uptake capacity and P utilization efficiency ulteriorly regulated plant P content.

Key words: nitrogen deposition, forest ecosystems, plant phosphorus concentration, stoichiometry, underlying mechanisms

FENG Chan-Ying, ZHENG Cheng-Yang, TIAN Di. Impacts of nitrogen addition on plant phosphorus content in forest ecosystems and the underlying mechanisms[J]. Chin J Plant Ecol, 2019, 43(3): 185-196.

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