The impacts of crop rotation systems on the arbuscular mycorrhizal fungal (AMF) spore density, mycorrhizal colonization of rice roots, soil C fractions and C stocks in seasonally dry climatic zone of Sri Lanka were examined in Rice–Soybean (RS) and Rice–Onion (RO) crop rotation systems during the subsequent rice cultivation season and, compared these with a rice monoculture, i.e. Rice–Rice (RR). The study also examined the correlations between AMF occurrence and soil carbon stocks. Results revealed that RS crop rotation system significantly enhances the occurrence of AMF spores in soil with a higher fraction of large sized spores, the total organic C (TOC), microbial biomass C (MBC), water soluble C (WSC), labile C and a high AMF colonization in rice roots in the subsequent rice cultivation season. The diversity of AMF morphospecies were also the highest in RS. Reduction in AMF density in the soil in RR crop rotation system may be due to prolonged anaerobic conditions prevailed. The growth of onion has drastically reduced the AMF colonization in rice and soil C contents. Soil carbon stocks showed positive correlations with % root colonization and AMF spore number in soil. Thus, the study confirmed that C stocks in paddy soils can be improved by intercropping with AMF supporting plants like soya bean. This is the first report that shows positive correlations of AMF sporulation and % root colonization in lowland rice with soil carbon stocks.

在水稻-大豆（RS）和水稻-洋葱中研究了轮作制度对斯里兰卡季节性干旱气候区的丛枝菌根真菌（AMF）孢子密度，水稻根系菌根定殖，土壤碳组分和碳储量的影响。 （RO）在随后的水稻种植季节中的作物轮作系统，并将其与水稻单一栽培进行比较，即。稻米（RR）。该研究还检查了AMF发生与土壤碳储量之间的相关性。结果表明，RS作物轮作系统显着增强了土壤中AMF孢子的发生，其中较大比例的大孢子，总有机碳（TOC），微生物生物量C（MBC），水溶性C（WSC），不稳定C和在随后的水稻种植季节中，水稻根部会发生较高的AMF定殖。在RS中，AMF形态种类的多样性也是最高的。RR作物轮作系统土壤中AMF密度的降低可能是由于长期厌氧条件的普遍存在。洋葱的生长大大减少了水稻和土壤中C的AMF定殖。土壤碳储量与土壤根定殖百分率和AMF孢子数呈正相关。从而，该研究证实，通过与大豆等AMF支持植物间作，可以改善水稻土中的碳储量。这是第一个显示低地水稻中AMF孢子形成和根定殖百分比与土壤碳储量呈正相关的报告。