The Variation of Soil Phosphorus Fractions and Microbial Community Composition under Consecutive Cucumber Cropping in a Greenhouse

The distribution of phosphorus (P) fractions in soil plays a decisive role P bioavailability; however, the characteristics under consecutive cropping solar greenhouse remain unclear. To evaluate effects long-term successive vegetable on and microbial community composition soil, continuous experiment was conducted using cucumber (Cucumis sativus L.) starting from 2006 to 2018. Soil were determined Hedley extraction method phospholipid fatty acid (PLFA) method, respectively, 1st, 9th, 13th, 21st rounds cultivation. total (TP) content increased 0.90 g·kg−1 1st round 3.07 With an increase rounds, available (AP) activation coefficient (PAC) decreased, with no significant difference between 13th rounds. After 21 cropping, organic matter (SOM) 16.34 g·kg−1, 1.42 times that round. abundance bacteria, actinomycetes, Gram-negative bacteria (G−), Gram-positive (G+), PLFAs initially but then decreased significantly, ratios fungi:bacteria (F/B) G+/G− also significantly contents labile P, moderately non-labile over Together, these results demonstrate can directly lead accumulation fractions, it affect actinomycetes through SOM enrichment, which indirectly leads P. This study provides theoretical basis for future fertilizer management production sustainability.