[Dynamics of unprotected soil organic carbon with the restoration process of Pinus massoniana plantation in red soil erosion area].
By the method of spatiotemporal substitution and taking the bare land and secondary forest as the control, we measured light fraction and particulate organic carbon in the topsoil under the Pinus massoniana woodlands of different ages with similar management histories in a red soil erosion area, to determine their dynamics and evaluate the conversion processes from unprotected to protected organic carbon. The results showed that the content and storage of soil organic carbon increased significantly along with ages in the process of vegetation restoration (P < 0.01). The unprotected soil organic carbon content and distribution proportion to the total soil organic carbon increased significantly (P < 0.05) after 7-11 years' restoration but stabilized after 27 and 30 years of restoration. It suggested that soil organic carbon mostly accumulated in the form of unprotected soil organic carbon during the initial restoration period, and reached a stable level after long-term vegetation restoration. Positive correlations were found between restoration years and the rate constant for C transferring from the unprotected to the protected soil pool (k) in 0-10 cm and 10-20 cm soil layers, which demonstrated that the unprotected soil organic carbon gradually transferred to the protected soil organic carbon in the process of vegetation restoration.
Mao-Kui
MK
Lü
Jin-Sheng
JS
Xie
Yan-Xiang
YX
Zhou
Hong-Da
HD
Zeng
Jun
J
Jiang
Xi-Xiang
XX
Chen
Chao
C
Xu
Tan
T
Chen
Lin-Chi
LC
Fu
D002244:Carbon / Q000032:analysis*; D057486:Carbon Cycle; D065928:Forests; D028223:Pinus; D012987:Soil / Q000737:chemistry*; D062211:Spatio-Temporal Analysis
D012987:Soil; D002244:Carbon