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Besides, the RI index was on a "high" risk level (120 less then RI less then 24 with an obvious spatial distinction. (3) The anthropogenic factors were the main sources for heavy metals, and mixed sources and natural sources were considered as the minor sources for metals. (4) The sources contributions for Co had obvious spatial heterogeneity in each park situated in four different urban planning districts.The effect of char addition on the digestion of animal by-products was evaluated as a way for enhancing the performance of the pr
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