摘要
为研究热带地区气候干湿状况对水稻土有机质含量及组分的影响,选择海南气候干湿程度差异大的琼中和东方两地的水稻土作为研究对象,利用物理分组方法研究其有机质及组分的含量,探讨轻组有机质(LFOM)、重组有机质(HFOM)与有机质含量的关系以及富里酸(FA)、胡敏酸(HA)与重组有机质的关系,并分析了两地水稻土固定有机质的潜力。结果表明:湿润气候区水稻土有机质以及其各组分含量均显著高于半干旱气候区,土壤有机质含量与轻组有机质及重组有机质含量均呈极显著正相关,重组有机质含量与富里酸含量呈极显著正相关;干燥气候区水稻土对有机质的固持潜力大于湿润气候区。土壤重组有机质适应热带地区湿润气候,此外,热带地区土壤腐殖质复合能力弱,土壤腐殖质以富里酸为主,应采取适宜措施增加热带干燥气候区水稻土碳固定的潜力。
Paddy soils were sampled from Qiongzhong county and Dongfang city in Hainan Province,where the humidity was highly different,,to analyze the influences of the dry and wet climatic conditions in tropical region of China on organic matter and its components in the paddy soils. The relationships between the organic matter and its components,and the organic matter sequestration potential were investigated by using the method for physical fractionation. Dry and wet climatic conditions affected the content of soil organic matter and its components. The paddy soils contained higher organic matter and components in the humid climatic region than in the semiarid climatic region. The organic matter content showed a significantly positive linear correlation with the light fraction organic matter（ LFOM） content and the heavy fraction organic matter（ HFOM） content,and the HFOM content was also significantly positively correlated with fulvic acid（ FA）. Paddy soils had higher potential of organic matter fixation in the semiarid region than in the humid region. Humid climate is conducive to the formation of HFOM. The soil humus in the tropical region had weak combining ability and contained mostly FA.Measures should be taken to increase the potential of paddy soils in carbon sequestration in the dry tropical region.
作者
赵伶茹
杨霖
方雅各
谢洋
李思敏
王怡洁
孟磊
ZHAO Lingru YANG Lin FANG Yage XIE Yang LI Simin WANG Yijie MENG Lei(College of Agronomy, Hainan University, Haikou, Hainan 570228, Chin)
出处
《热带生物学报》
2016年第3期338-342,共5页
Journal of Tropical Biology
基金
国家自然科学基金项目(41261063)
海南省自然科学基金(314046)
关键词
干湿度
水稻土
土壤有机质
物理分组
humidity
paddy soil
organic matter
physical fractionation
