植被恢复过程中侵蚀红壤有机质变化研究

The Change of Soil Organic Matter Under Vegetation Restoration on the Eroded Red Soil

基于2001年与2011年两期土壤样品数据,对江西省兴国县植被恢复过程中侵蚀红壤有机质的变化进行了研究。结果表明:10年间,纯林、林草及林灌草结构下表层(0～10 cm)土壤有机质变化值分别为5.8、0.1及8.0 g/kg,千枚岩、红砂岩及花岗岩成土母质发育的红壤表层土壤有机质变化值分别为8.7、0.5及3.1 g/kg。植被垂直结构对表层土壤有机质的变化影响显著,主要是由于植被覆盖度及生物量的不同引起的凋落物量的差异所导致;土壤颗粒组成是表层土壤有机质变化的重要影响因素之一,研究区表层土壤有机质的变化与黏粒含量的变化呈显著正相关(P<0.05);此外,林下土壤侵蚀也影响着表层土壤有机质的变化。

The change of soil organic matter under vegetation restoration on the eroded red soil in Xingguo County,Jiangxi Province was studied,based on the soil samples collected in 2001 and 2011.The results showed that the various vertical structure of vegetation made the change of soil organic matter different,the restoration degree under various vegetation structures in the order was：forest,shrub and grass structure （8.0 g/kg） ＞ forest and grass structure （-0.1 g/kg） ＞ pure forest structure （-5.8 g/kg）,which was caused by the quality of the litter.The soil organic matter in surface soils （0-10 cm） derived from phyllite,red sandstone and granite parents changed 8.7 g/kg,-0.5 g/kg and-3.1 g/kg,respectively.Soil particle was the one of the main factors influenced soil organic matter change,which was significantly correlated with the change of clay contents （P ＜ 0.05）.Furthermore,the soil erosion under the forest was also affecting the change of soil organic matter.