海南植胶区砖红壤土类有机质变化趋势

Trends of Soil Organic Matter in Latosol Group in Rubber Planting Areas in Hainan Island

针对海南植胶区土壤肥力普遍下降,以海南植胶区砖红壤亚类和黄色砖红壤亚类为研究对象,采用不同年代耕型和非耕型土属有机质含量对比的方法,研究了土壤有机质的变化趋势。结果表明,耕型砖红壤土属有机质含量平均下降幅度为26.09%,非耕型砖红壤土属有机质含量平均下降幅度为23.36%;3种耕型黄色砖红壤土属有机质含量平均上升幅度为41.77%,6种耕型黄色砖红壤土属有机质含量平均下降幅度为22.77%;4种非耕型黄色砖红壤土属有机质含量平均上升幅度为51.50%,5种非耕型黄色砖红壤土属有机质含量平均下降幅度为19.67%。说明砖红壤亚类耕型和非耕型土属有机质平均含量均表现出明显的下降趋势,黄色砖红壤亚类有机质平均含量变化趋势:3种耕型土属明显上升,6种明显下降;4种非耕型土属明显上升,5种明显下降。

According to the decline of the soil fertility in rubber planting areas in Hainan Island,the trends of soil organic matter in arable and non-arable soil genus of latosol subgroup and yellow latosol subgroup in Hainan rubber planting areas were studied compared with its contents in different decades.The results showed that the average rate of decline of organic matter contents in arable latosol genus was 26.09 ％,and in no-arable latosol genus was 26.09％ ; the average rate of increase of organic matter contents in thee arable yellow latsol genus was 41.77 ％,but decline in six arable yellow latosol genus was 22.77％ ; the average rate of increase of organic matter contents in four noarable yellow latosol genus was 51.50 ％,but decline in five no-arable yellow latosol genus was 19.67 ％.This means that the downward trends of the content of organic matter in latosol subgroup were significant; and six arable yellow latosol genus and five no-arable yellow latosol genus were also significant,but upward trends in three arable yellow latosol genus and four no-arable yellow latosol genus were significant.