Effects of Plastic Film Mulching on Soil Enzyme Activities and Stoichiometry in Dryland Agroecosystems.

The correlation analysis ( Figure 6 ) shows that soil pH was positively correlated with βG and AP ( p < 0.01); the SOC content in the soil showed a highly significant positive correlation ( p < 0.01) with E C:N and E C:P and a significant negative correlation ( p < 0.05) with E C:N .

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At each stage, with the increase in nitrogen application levels, the soil EEA showed a trend of increasing first and then decreasing (or remained unchanged), and both LD and PM treatments reached their highest activity at the 225 kg·hm −2 nitrogen application rate.

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Meanwhile, the SOC, TN and TP contents under the PM and LD treatments showed an increasing trend with the increase of in nitrogen application levels and reached the highest level at 225 kg·hm −2 on the whole ( Figure 1 , Table 1 ).

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