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How agriculture managements influence biogeochemical cycles of soil carbon: processes, mechanisms and ecological consequences As the largest terrestrial carbon (C) pool, soil C includes soil organic carbon (SOC) and soil inorganic carbon (SIC, mainly solid carbonate). The global soil carbon pool is ~3 times the size of the atmospheric pool and ~4 times the size of the biotic pool. Recently, Earth is becoming more vegetated and biological carbon sequestration is significant. The carbon sink capacity of agricultural and degraded soils can account for approximate 50-66% of the historic carbon loss at the global scale. Similarly, individual countries (e.g. China) have seen SOC increases across agroecosystems over the last decades mainly due to the intensive agricultural activities in terms of nitrogen (N) fertilizers. However, substantial reactive N was involved into the ecosystem and thus significantly accelerated soil acidification at the global scales. This evidenced phenomenon shifted
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