| Plantation is an important part of the world’s forest resources, make an important contribution to economic development and the ecological restoration and reconstruction,. Although the rapid development of the plantation and ease to a certain extent, can meet the demand of the society, but which brings a series of ecological problems restricting the sustainable development of the plantation. Reforestation of pinus massoniana is China’s southern region of the main tree species, is also the pioneer of HuangShanDe afforestation tree species. Based on the basis of different forest age of masson pine plantation as the research object, through the "time-space replacement method" to study the easy oxidation of pinus massoniana plantation soil organic carbon, carbon, organic carbon, soil aggregate particles state grade distribution and aggregate distribution and change rule of organic carbon, the basis of the results of the study can provide area of pinus massoniana plantation and continuous business to provide the reference, can also be used for our country’s plantation management impact on soil carbon library provides the basis. The main research results are as follows:(1) In the different age sample plots, soil organic carbon content ranged from 8.2-16.43g/kg. With the age added, the change trend is increased before they are induced and then increased. With the soil layer deepen, soil organic carbon content induced significantly (P>0.05),0-20 cm soil organic carbon content> 20-40 cm soil organic carbon content.(2) With the stand age increased, particulate organic carbon content and easy oxidation carbon content keep the same change trend with soil organic carbon content. There exist positive correlation relationship between any two of these three carbon content and all of them reach the very significant level. Ratios of POC/TOC and ROC/TOC are inconsistent in different stand ages and different soil layers. Overall tendency is POC/TOC> ROC/TOC and keep the same trend with TOC in different stand age. Among them, POC and ROC accounted 10.88～53.07%,5.49～16.49% respectively.(3) Drying aggregate composition ratio of different stand age soil is "V" glyph distribution when arranged them from the min. to the max. In the 0-20 cm layer, the highest composition is aggregation which diameter>5mm. The variation range is 25.3～41.33%, which is significantly higher than other aggregations. The highest particulate size of waterstable aggregate is< 0.25 mm. With the particulate size decreased, the content of waterstable aggregate increased. In the 0-20 cm layer, the particulate size between 0.25-0.5 mm and< 0.25 mm of waterstable aggregate content declined with stand age added. In the 20-40 cm soil layer, with the aggregate size declined, their ratios of total content declined too. The same aggregate size ratio decreased with the stand age increased.(4) Soil organic carbon in aggregate varied with stand age and aggregate size changing. The content of TOC in aggregate increased before decline, though there is no regulate changing model between stand age and aggregate size.To sum up, forest age not only affects the soil carbon content, and affects the distribution characteristics of soil aggregate, the organic carbon sequestration ability also has a significant impact.In pinus massoniana plantation management should make the corresponding management measures according to different growth period, especially strengthen the vigorous growth of mid-maturation forest management, can effectively promote the pinus massoniana plantation soil carbon fixation. |
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