摘要
X-射线衍射分析表明,红壤的粘粒矿物组成以高岭石和水云母为主,伴有少量14埃过渡矿物;黄棕壤粘粒矿物组成以水云母、高岭石、蛭石为主,有的黄棕壤样本也伴有少量14埃过渡矿物。测定粘粒固定磷、钾的实验结果表明,游离氧化铁是黄棕壤中固磷的主要载体,羟基铝的固磷作用比游离氧化铁小;羟基铝是红壤粘粒固磷作用的主要载体,游离氧化铁的固磷作用比羟基铝小。黄棕壤的固钾量一般比红壤大。羟基铝的存在有利于磷的固定而有碍于钾的固定。其影响程度的大小顺序与土壤粘粒样本中14埃过渡矿物的含量多少和热稳性高低的顺序是完全一致的。红壤与黄棕壤中,磷、钾固定的载体和机理的不同,意味着影响其磷、钾有效性的因素不同,为提高其磷、钾有效性所采取的措施也宜有所不同。
The clay minerals of red earth mainly consist of kaolinite and hydromicas, whilethose of the yellow-brown earth mainly consist of hydromicas, kaolinite and vermicu-lite. And all of the soils have few amount of 14(?) intergradient minerals. According to the experiment, the free iron oxides and hydroxyl aluminium of thesoils are the main carriersin fixing P, while the fixing power of kaolinites is smaller. As for the fixation of P in red earth, the fixing power of hydroxyl aluminium ishigher than that of free iron oxide. But in yellow-brown earth, the result turns outcontrary to the above-mentioned conclusion. To the fixation of k, the fixing powerof yellow-brown earth is higher than that of the red earth. The hydroxyl aluminium is favourable for the fixation of P, but is unfavourable forfixation of K. This effect is proportional so the content of 14(?) intergradient mille-rals as well as the heat-stable ability in soil clay fraction.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1990年第2期163-170,共8页
Journal of Huazhong Agricultural University
关键词
黄棕壤
红壤
磷钾的固定
14埃基铝过渡矿物
游离氧化铁
羟基铝
yellow brown earth
red earth
fixation of P and K
free iron oxide
hydroxyl aluminium
14A intergradient minerals
