福建耕地土壤硫库、形态及吸附特性研究

Study on soil sulphur pool, form and absorption character in arable land of Fujian

通过采集372个福建耕地土壤样品进行室内分析化验的结果,全省耕层土壤平均有效硫含量为(27.6±23.5)mg.kg-1,其中<16 mg·kg-1临界值的缺乏级样品占37.1%,连同16-30 mg·kg-1潜在缺乏级样品共占68.20%,说明福建是贫硫土壤省份,且闽东南地区耕地土壤缺硫比闽西北地区更为严重。明确了耕地主要土种有效硫含量和分布状况,以及它们之间的差异。通过10个土种土壤样品对硫吸附能力的试验表明,不同土壤对硫的吸附能力不同,并分别建立一元线性模型(y=a+bx),其拟合精度都达到极显著水平,从而计算出10个土种对硫的吸附固定率为35.5%-61.7%,平均46.6%;为确定土壤适宜施硫量,对37个土样进行硫组分研究,明确了不同利用类型土壤有机硫和无机硫组分含量和比例状况。

The results showed that average available sulphur was 27.6±23. 5 mg · kg^-1 in 372 cultivated soil samples of Fujian arable land. 37.1% of the total samples was S deficient, 68.2 % of total soil samples were S deficient or potential deficient, which suggested that sulphur was not enough in Fujian arable land. Sulphur in southeast territory was less than that in northwest territory. The content and distribution of available sulphur were different in main soil types of Fujian cultivated land. The analysis of soil absorbability of 10 soil sample showed that different soil had different absorbability to sulphur from 35.5% to 61.7% with the average of 46.6%, and a liner model （y=aq-bx） was significant, fitting the aborption characters. And the ratio of sulphur absorbed and fixed by different soil could provide index for sulphur fertilizer application. The studies on sulphur components of 37 soil sample revealled the different ratio of soil organic and inorganic sulphur content in different utilized soils.