Distribution characteristics of soil organic carbon storage and carbon density from damaged vegetation under different climate types in Wenchuan earthquake region
Taking typical regions affected by Wenchuan earthquake as research area including semi-arid dry warm river valley and subtropical humid monsoon climates, we set up the undestroyed region (UR) and destroyed and treated region (DR) as sampling plots. We determined soil water content, bulk specific gravity and organic carbon (soil organic carbon, SOC) content in different levels (0-5, 5-10, 10-20 cm). We analyzed the distribution characteristics between undestroyed region and destroyed and treated region in different climatic regions. The results were as follows: (1) SOC content of each soil layer in UR was significantly higher than that of DR in two typical climatic regions (P<0.05), while SOC increased first and then decreased with the soil depth. The SOC content in different soil layers in the same climatic region had no significant difference (P>0.05) with a fluctuated trend. (2) SOCD in UR was significantly higher than that in DR (P<0.05) and increased with the soil depth. It did not show significantly different (P>0.05) in different soil layers in the same climatic region. (3) Treatments in both climatic regions significantly influenced SOC content, but the interaction between treatments and soil layers and the influence of different soil layers was not significant (P>0.05). Different treatments and soil layers as well as their correlation significantly influenced SOCD (P<0.01), the interation between treatments and climate types was significantly different (P<0.05). The results indicate that soil organic carbon content in destroyed and treated region is lower than that in undestroyed region. Our results will supply the data for evaluating the effects of ecological restoration measures.