Research Progress on Effects of Phosphorus Addition on Forest Soil Organic Carbon
The change of soil nutrient supply capacity may change the functions of forest soil carbon pool as source and sink.Phosphorus is one of the limiting nutrients in terrestrial ecosystem,and its a-vailability can directly or indirectly regulate the turnover of soil organic carbon.At present,many liter-atures have discussed the effect of phosphorus addition on forest soil organic carbon and its regulation mechanism,but relatively systematic and comprehensive summary is still lacking.The effects of phos-phorus addition on forest soil organic carbon content were reviewed and the influence mechanism of phosphorus addition on forest soil organic carbon was revealed from three aspects:organic carbon input(litter and root exudates),organic carbon output(soil respiration)and the mechanism of organic car-bon sequestration.It was found that soil organic carbon content increased,decreased and did not change significantly after phosphorus addition,which was mainly related to ecosystem type,intensity of phosphorus addition and soil carbon turnover process.In addition,the short duration of phosphorus ap-plication,the inconsistent determination methods of organic carbon components and the lack of means to reveal the carbon turnover process are the constraints to systematically predict and evaluate the effects of phosphorus addition on soil organic carbon.In the future,we should focus on the effects of long-term phosphorus application on soil organic carbon,strengthen the integration of new technologies of microbial functional omics,and consider the contribution of nitrogen and phosphorus interaction to forest soil organic carbon under the background of global change.The results are helpful to further un-derstand and accurately predict forest soil carbon dynamics under future climate change scenarios,and provide theoretical basis for forest management.
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