关键词: 原核表达, 原核表达

Abstract:

56 sample points were selected in Jinzhai Mazongling nature reserve of Anhui province in order to analyze forestry soil organic carbon content and the distribution of space and time. The results showed that the distribution of soil organic carbon content in this research area varied with soil depth, altitude and different seasons. The average soil organic carbon content was 3.07% in 0-20 cm soil layers, ranged from 0.94% to 15.67%; the average soil organic carbon content was 1.98% in 30-40 cm soil layers, ranged from 0.17% to 8.54%; the average soil organic carbon content was 1.68% in 50-60 cm soil layers, ranged from 0.46% to 7.81%. Organic carbon content increased with altitude. The impact of the seasons on the organic carbon contents in the top soil is greater than that in the deep soil. The seasonal variation was obviously. Soil organic carbon content in autumn was higher than it in spring. The impact of the seasons on the organic carbon contents in the topsoil was greater than that in the deep soil. In this area, the soil layer of 0-20 cm fixed carbon was from 8.28×105 t to 8.31×105 t. The soil layer of 30-40 cm fixed carbon was from 5.46×105 t to 5.73×105 t. The soil layer of 50-60 cm fixed carbon dioxide was from 4.68×105 t to 5.33×105 t.