Synergy between compost and cover crops leads to increasedsubsurface soil carbon storage

摘要: Abstract. Subsurface carbon stocks are a prime target for efforts to increase soil storage climate change mitigation and improving health. However, subsurface (C) dynamics not well understood, especially in soils under long term intensive agricultural management. We compared C tomato-corn rotations after 25 years of differing nutrient management the California Central Valley: CONV (mineral fertilizer), CONV+WCC fertilizer + cover crops) ORG (composted poultry manure + cover crops). Our results showed ~19 Mg/ha SOC down 1 m systems, no significant increases or accumulation carboxyl rich (60–100 cm) horizons all systems. Systems also had greater amounts aromatic order ORG>CONV+WCC>CONV. identified potential interaction between cover crops compost, theorizing that increased macropores from crop roots facilitate transport soluble nutrients into subsurface, thereby increasing stocks. These demonstrate tilled systems highlight pathway layers.