Can high level of phosphorus reduce the food resources for mycophagous mites?

Soil is known to be the largest organic carbon reservoir in the terrestrial biosphere, and plays a crucial role in the terrestrial carbon cycle. The agricultural soil compartment has the potential to increase carbon sequestration with available management options. Although different farming practices have reportedly resulted in various carbon sequestration rates, as driven by the soil food web, there is lack of adequate knowledge regarding the processes and mechanisms.

The application of phosphorus fertilizer in China rapidly increased from 20 kg ha -1 in 1980 to 160 kg ha -1 in 2008, which resulted in remarkable accumulation of phosphorus in agricultural soil. According to a long-term observation by the China Fertilization Net, the content of available phosphorus in about 40% long-term experimental sites increased to nearly or over 100 ppm, which is significantly correlated with the application of organic and conventional chemica (NPK) fertilizers.

In our long-term field experiments, accumulation of available phosphorus in soil was observed under the treatments with either organic or chemical fertilizer. Based on changes in the community structure and abundance of soil mites, a hypothesis was proposed, that a “high level of phosphorus probably suppressed fungi, thus reducing the food resources for mycophagous mites".

In order to prove this hypothesis, two field experiment sites were selected in Quzhou County of Heibei Province and Shouguang County of Shandong Province. Both sites were located in the North Plain of China. Investigations on soil physicochemical properties, soil organic carbon fractions, and soil microorganism structure and abundance were conducted in three types of agricultural soils.

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