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The direct effects of burning led to increased pH and nutrient availability (extractable phosphorus and calcium), which decreased within 2 to 5 years of fallow. The increase in basic cations was sufficient to guarantee the soil nutrient status up to 7 years of fallow. Successive slash-and-burn cycles in the same area caused an increase in soil sand content, and reduced cation exchange capacity.A full-scale sewage treatment plant in Xi'an city is discovered as the first mainstream anaerobic ammonia oxidation (anammox) treatment process i
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