摘要
为了探明湖南烤烟主产区土壤对磷的供肥潜力,为烟区合理施肥提供理论依据,研究了湖南烤烟主产区5种主要成土母质发育的常年植烟土壤对磷的吸附与解吸特性,并拟合了Langmuir等温吸附方程。结果表明:石灰岩母质土壤具有最大磷库和最大的缓冲容量,第四纪红土母质土壤吸附结合能最大,紫色板页岩具有最大的磷吸附饱和度;吸磷量之间的差别为:石灰岩>板页岩>第四纪红土>紫色砂页岩>紫色板页岩;石灰岩、第四纪红土、板页岩、紫色砂页岩、紫色板页岩母质土壤的标准需磷量分别为209.50、188.76、146.58、122.28、77.21kg/hm2。土壤固磷作用强烈,以第四纪红土母质土壤的固磷能力最强,解吸率最低;紫色板页岩土壤的解吸能力最强,解吸率最高。
In order to investigate the fertilizer supplying potential and provide the theoretical basis of rational fertilization of Hunan main tobacco-growing area, this experiment studied the characteristics of phosphorus adsorption and desorption on long-term tobacco-planted soil samples derived from 5 different parent materials in Hunan Province by simulating Langmuir equation. The results showed： soil derived from limestone possessed the maximum phosphorus capacity and the maximum buffering capacity, and soil derived from quaternary red clay possessed the maximum adsorption binding energy, meanwhile soil derived from purple slate shale got the highest degree of phosphorus sorption saturation. The difference of the P adsorption amount was： limestone〉slate shale 〉quaternary red clay〉purple sandy shale〉purple slate shale. The standard required phosphorus of soil derived from limestone, quaternary red clay, slate, purple sandy shale, purple slate shale were 209.50, 188.76, 146.58, 122.28, 77.21 kg/hm2. Soils had strong fixation effect on phosphorus. Among of them, soil derived from quaternary red clay ranked the highest fixation capability and lowest desorption rate toward phosphorus, while soils from purple slate shale had the maximum desorption capability and the highest desorption rate.
出处
《中国农学通报》
CSCD
2013年第12期115-119,共5页
Chinese Agricultural Science Bulletin
基金
湖南省烟草公司"湖南特色优质烟叶生产的土壤保育和养分资源综合管理技术研究"(08-10Aa02)
关键词
磷吸附
解吸
植烟土壤
成土母质
湖南
phosphorus adsorption/desorption
tobacco-planted soil
parent material
Hunan
