Effects of Tamarix chinensis plantations on Soil Organic Carbon and Carbon Pool Management Indicators in the Yellow River Delta
In order to study the effects of Tamarix chinensis plantations on soil organic carbon and carbon pool management indicators in coastal saline-alkali area,taking the Tamarix chinensis plantations at different ages(3 a,8 a,12 a)in the Yellow River Delta as research objects,using the space-time intergenerational method and taking the adjacent bare land(CK)as comparison,the effects of forest age on soil organic carbon(SOC),active organic carbon(DOC,MBC,EOC),resistant organic carbon(ROC)and carbon pool management indicators(CPMI)were studied.The results showed that SOC and its components in different soil layers could be affected by forest age,and decreased gradually with the increase of soil depth.The effects of forest age on SOC and its components were consistent,and the order of SOC and its components both were 12 a＞8 a＞3 a＞CK.Compared with CK,the average content of SOC(0-60 cm)at three forest ages increased by 23.95％,46.38％and 111.03％respectively.The average content of DOC、MBC and EOC of 12a increased by 127.06％,68.99％and 78.49％respectively compared with CK,which were significantly higher than those at other forest ages.The average content of ROC at three forest ages increased significantly,which were 1.22,1.59 and 1.87 times of CK.The SOC and its components in the surface layer of 0-20 cm at different forest ages were significantly higher than those in other soil layers(P＜0.05),and presented obvious surface aggregation.No significant differences were founded in MBC between soil layer of 20-40 cm and 40-60 cm at 3 a and 12 a,but there were significant differences among the other soil layers(P＜0.05).The CPMI of different soil layers increased with the increase of forest age,and the CPMI of 8 a and 12 a increased significantly,with 12 a highest and 8 a second.The correlation analysis showed that SOC and its components all reached significant and extremely significant levels.The soil EOC,DOC,MBC and ROC carbon components could explained 93.50％,83.00％,53.82％and 91.89％of changing of SOC respectively.In conclusion,the extension of forest age is conducive to the accumulation of soil organic carbon components and the improvement of CPMI in coastal saline-alkali areas.
soil organic carbonactive organic carboncarbon pool management indicatorsYellow River Delta
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