Simulation On The Effects Of Temperature And Moisture On Mineralization Of Organic Matter In Main Cultivated Soils Of Jilin Province

Global climate change has received the attention of all countries in the world today. The changes of temperature and precipitation caused by climate will have a significant impact on the decomposition of soil organic matter. This experiment using indoor incubation method and simulated two kinds of climate conditions of warming-dried(increased temperature in the case of soil moisture is lower) and warming-wetted(increased temperature in the case of soil moisture is higher), studying the organic matter content and active organic carbon fractions content(easily oxidized organic carbon, microbial biomass carbon, dissolved organic carbon) in main cultivated soils(black soil, albic soil, chernozem) of Jilin province, in order to provide a theoretical foundation of soil fertility techniques to adapt to climate change. The research results are as follows:1. Under the warming-dried condition and the warming-wetted condition, the change trend of total organic carbon content of soil was different. Under the warming-dried condition, the total organic carbon content of black soil and albic soil in the four setting temperature conditions showed that:-10?>30?>20?>10?,the total organic carbon content of chernozem shows that:-10?>30?>10?>20?. Temperature and organic carbon in black soil showed a significant negative correlation, temperature and organic carbon in albic soil and chernozem had no correlation. Under the warming-wetted condition, total organic carbon content of three kinds of soils decreased. Temperature and total organic carbon in black soil, albic soil and chernozem had a very significant negative correlation. At the conditions of same temperature and different moisture, the total organic carbon content in the lower moisture treatment was larger than the suitable moisture condition.2. Under the warming-dried condition and the warming-wetted condition, the change trend of mineralization ratio of soil was different. Under the warming-dried condition, the mineralization ratio of black soil and albic soil in the four setting temperature conditions showed that: 10?>20?>30?>-10?, the mineralization ratio of chernozem shows that:-10?>30?>10?>20?.Under the warming-wetted condition, the mineralization ratio of three kinds of soils shows that: 30?>20?>10?>-10?.The research results also show that in the condition of 30?and 150 days, soil water content increased from 7.5%-9.5% to 15%-19%, the amount of soil organic carbon mineralization loss can be increased from 5.2%-10% to 13.7%-14%.3. Under the warming-dried condition and the warming-wetted condition, the change trend of labile organic carbon content of soil was different.Under the warming-dried condition, the easily oxidized organic carbon content of black soil in the four setting temperature conditions showed that:-10?>30?>20?>10?,the easily oxidized organic carbon content of albic soil and chernozem show that-10?>30?>10?>20?. Temperature and the easily oxidized organic carbon in black soil and albic soil showed a significant negative correlation, temperature and the easily oxidized organic carbon in chernozem had no correlation. The microbial biomass carbon content of three kinds of soils in the four setting temperature conditions showed that:-10?>30?>20?>10?. Temperature and the microbial biomass carbon in black soil and chernozem showed a significant negative correlation, temperature and the microbial biomass carbon in albic soil had no correlation. The dissolved organic carbon content of three kinds of soils in the four setting temperature conditions showed that:-10?>30?>20?>10?.Temperature and the dissolved organic carbon in black soil showed a very significant negative correlation, temperature and the dissolved organic carbon in albic soil and chernozem had no correlation.Under the warming-wetted condition, the labile organic carbon content of three kinds of soils were decreased.Temperature and the labile organic carbon in black soil, albic soil and chernozem showed a very significant negative correlation4. Under the warming-dried and warming-wetted conditions, soil stability, fertility and nutrient availability of soil were decreased. They decreased significantly under the warming-wetted condition. The correlation between total organic carbon and active organic carbon was very significant. The active organic carbon fraction can be used as an early indicator of the effect of temperature on the organic matter content.