Comparative Study on Soil Organic Carbon and Its Components in Different Plant Community Types
In order to understand the effect of different plant communities on soil organic carbon content,4 plant communities were selected in the middle of the northern slope of Tianshan mountains,including Picea schrenkiana,Iris loczyi shrub,Achnatherum inebrians and Malva rotundifoli.5 samples of 1 m × 1 m were set in each community,and the soil samples were taken by 5-point for analyzing the content and constituent of total organic carbon in 0-10,10-20,20-30,30-40 and 40-50 cm soil layers.The results showed that the soil organic carbon contents in 0-20 cm layer of 4 plant communities were higher,and decreased to be stable in 30-50 cm soil layers.The total soil organic carbon content of Picea schrenkiana was 244.24 g·kg-1,which was significantly higher than other communities with 86.62％,20.66％and 41.32％increase to Iris loczyi shrub,Achnatherum inebrians and Malva rotundifoli,respectively.The organic carbon contents of 3 different oxidation degrees in 4 plant communities showed highly oxidizable organic carbon＞difficult to oxidize organic carbon＞easily oxidizable organic carbon.In 0-10 and 10-20 cm soil layers,the contents of highly oxidizable and the oxidizable organic carbon were higher in Achnatherum inebrians community.For the content of difficult to oxidize organic carbon,Malva rotundifoli community was higher in soil of 30-50 cm layer,Picea schrenkiana community was higher in soil of 10-20,40-50 cm layers,Achnatherum inebrians community was higher in soil of 20-30,30-40 cm layers.The contents of inert organic carbon in 4 communities were 48.61,29.46,54.46 and 39.17 g·kg-1,respectively,accounting for about 20％of the total organic carbon.It indicated that different plant community in the northern slope of Tianshan mountains would affect the contents,composition and spatial distribution of soil organic carbon.As a sensitive indicator of soil carbon content dynamic change,soil organic carbon could timely reflect the turnover and dynamic change process of soil organic carbon pool.
万方数据
维普
