Carbon and nitrogen stoichiometry across plant-soil system accounts for the degradation of multi-year alfalfa grassland.

In contrast, PAD presented an increasing trend and ranged from 62.2% for planting for 5 years to 67.4% for planting for 20 years. 3.6.

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The soil TN content was between 0.89 g kg −1 and 1.02 g kg −1 , and the planting years had a significant effect on soil TN content, which showed a decreasing trend with increasing planting years ( Figure 2D ). 3.5.

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