Studies On The Effect Of Different Fertilization Patterns On Soil Respiration And Soil Nutrients In Maize Ecosystem

The effect of different fertilization patterns (such as normal chemical fertilizer, maize straw and farm manure) on soil respiration has been measured by the method of static chamber alkaline absorbing and the difference of soil carbon cycle has been analyzed by quantity. By studying the effect of different fertilization patterns on soil nutrients and yield, the sustainable fertilization patterns of farm ecosystem was explored, especially supply the practical direction and theory guiding for developing ecological agriculture and organic agriculture.The paper draws such conclusions:1 Soil temperature, soil water content, wind speed, air pressure, air temperature and air moisture all have an effect on soil respiration in the whole growth period. Among them, the amount of soil respiration has greater correlation with soil water content (0-20cm), soil temperature (5cm, 10cm, 15cm, 20cm), air temperature and air moisture, only soil surface (0cm) has a poor correlationship with soil respiration. Soil organic matter is the base of soil respiration. Large amount of soil respiration will exhaust a lot of organic carbon, which may lead to the decrease of soil nutrients. In addition, soil nitrogen pool also has an effect on soil respiration.2 The total amount of soil respiration are different in different fertilization patterns in the growth period (from May to Sep.). The amount of soil respiration in rum: manure culture (296.4kg/a)>normal chemical culture (254.3kg/a)>maize straw (227.1kg/a) >CK(227.1kg/a): Soil respiration ratio in growth period in turn : August>September>July>June>May in maize ecosystem.3 Since there is no obvious difference of soil respiration in the tendency in different fertilization patterns, the mean soil respiration can be regarded as the soil respiration of whole growth period in maize ecosystem. The amount of soil respiration is 252.8kg/a in the whole growth period (from May to Sep.) in maize ecosystem.4 The order of soil carbon pool loss is:Chemical fertilizer culture(17.3%)>CK(16.4%)>maize straw treatment(15.4%)>manure culture(15.2%).Chemical fertilizer culture soil carbon loss is the most and manure culture is the least ofsoil carbon pool from carbon balance. Soil organic matter can be regarded as one of soil fertility index, so manure culture and maize straw treatment is beneficial for soil fertility.5 Both organic matter fertilizer and chemical fertilizer have good effect on the increase in yield of maize and the two effects are almost the same, which indicates that manure can completely take the place of normal chemical fertilizer if it is reasonably used and organic agriculture is sustainable substitute agriculture. The result indicates that yield is obviously positively related to the content of soil organic matter, total nitrogen and total phosphorus. Manure culture, normal chemical fertilizer culture, maize straw can all improve soil organic matter, soil total nitrogen and soil total phosphorus which will decrease if maize is continuously planted without any fertilizer.Appliant: Qi Zhiyong Major: Ecology Supervisor: Prof.Wang Hongyan...