[Chemical structure characteristics of organic carbon in saline soil aggregates under straw returning condition].

We examined the regularity of distribution and chemical structure characteristics of organic carbon in soda alkaline fluvo-aquic soil aggregates after straw returning. We set up six different straw returning treatments in 2020, including 0 (CK), 2100 (ST), 4200 (ST), 6300 (ST), 8400 (ST) and 10500 kg·hm(full straw returning, ST). We measured organic carbon (OC) content and infrared spectroscopy characteristics of aggregates and internal different components through physical fractionation method and infrared spectroscopy technology.