作　　者： ; ; ; ;

机构地区： 中山大学生命科学学院

出　　处： 《中国农学通报》 2009年第5期104-109,共6页

摘　　要： 以桂西北喀斯特地区为例,研究了石漠化生态恢复过程中,马尾松对土壤有机质含量的影响,并对坡向、海拔高度、恢复年限、植被类型等生态因子与马尾松样地土壤有机质含量的相关性进行了分析,结果表明:土壤水分含量、电导率、凋落量、纤维素分解强度等与马尾松林土壤有机质含量呈正相关,凋落物有机质含量与马尾松林土壤有机质含量呈负相关。坡向对土壤有机质含量有较明显的影响,东南坡土壤有机质含量比西北坡高;在一定范围内,植被恢复时间越长,土壤有机质含量就越高;马尾松林土壤有机质含量通常随海拔的升高而有下降的趋势。但是,喀斯特地区生态环境十分脆弱,极易受到人为因素的影响。人为干扰的频度和强度不同,土壤有机质的变化规律也不同,干扰越大,有机质含量越低,土壤就越贫瘠。 This paper is mainly on the influence of soil organic matter （SOM） content of Pinus massoniana forest during the process of ecological restoration in karst rocky desertification area, the northwest of Guangxi. The correlation between SOM of the plots and the ecological factor, such as aspect, altitude, recovery time, vegetation types were analyzed. It is showed that the SOM of Pinus massoniana was positively correlated to soil moisture, conductivity, amount of litter and cellulose decomposition strength, but negative correlated to the organic matter of litter. The influence of aspect on SOM is obviously, generally speaking, the soil organic matter content of the southeast slope is much higher than that of the northwest slope. In a certain range of time, the longer of the vegetation recover time, the higher of the soil organic matter content. Although, there is a downward trend of SOM in Pinus massoniana forest with the increase of the altitude. Because the ecological environment is very fragile, so, it is easy affected by human activity. Different frequency and different intensity of human disturbance results in different changes of SOM, the stronger of disturbance, the much lower of SOM, in the end, the soil will become more barren.

关 键 词： 马尾松 土壤有机质 喀斯特石漠化 生态恢复

领　　域： [农业科学] [农业科学]