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Second, the economic driver is positively correlated with pollution and fluctuates with time. Finally, the technology driver also presents significant spatiotemporal heterogeneity. These spatiotemporal heterogeneities make water pollution control more complicated.Maize (Zea mays) stover, with its natural 13C abundance, was incubated for two years in a gravelly brown earth sandy loam soil that had been under long term cultivation to wheat (Triticum aestivum) for more than 30 years. The relative abundances of 13C in the maize amendment allo