Response of water extractable organic matter and its fluorescence fractions to organic farming and tree species in poplar and robinia-based alley cropping agroforestry systems
Organic farming and robinia increased soil organic C and total N content. Organic farming decreased water extractable organic matter (WEOM) content. Robinia enriched more soil organic C in organic farming than in integrated farming. Robinia increased WEOM components but did not affect the content of WEOM. Organic farming and ribinia both led to WEOM of higher stability.