摘要
叙述了全国除高山土带和亚高山土带外各主带土壤中固定态锭的绝对含量和相对含量以及各主要土壤的固按能力，讨论了固定态钦的来源、影响固定态按含量和土壤固按能力的因素，以及镇的固定和释放在土壤氮索内循环中的意义。以土带为单位，各土带中，黄棕壤带内的土壤的固定态按含量最高，为257mg／kg，砖红壤带内的土壤最低，仅为48mg／kg。耕地土壤0～20cm主体中，固定态铁的储量全国平均约为全氮储量的15％。各土壤中固有的固定态锁的有效性，主要决定于土壤母宕（质）的种类和土壤的风化程度，一般变动在3％～20％间。各土带中，黄棕壤带的土壤的固接容量最大，砖红壤带、赤红壤带、灰棕漠土带和棕漠上带的土壤以及红壤带的部分土壤则不具有固定加入铵的能力。根据固定态镇的绝对含量、它对土壤N库的贡献以及表土固按能力大小等的不同，将全国除高山上带和亚高山土带外分成了10个土区。
In this paper both the absolute and relahve contents of fixed NH+4 in soils ofsoil zones except the alpine and subalpine soil zones of China are presented, the NH+4fixation capacity and the availablity of fixed NH+4 of major soil groups are indicated.The origin of fixed NH+4, the factors affecting the content of fixed NH+4 and theablity for fixing NH+4 of soil, and the significance of NH+4 fixation and defixation inthe intemal cycle of soil N are disccussed. The content of flxed NH+4 in soils ofyellow brown soil zone, as a whole, is the highesL being 257 mg/kg, while that oflatosol zone is the lowesL being 48 mg/kg. On average about 15% of N to depth of20cm for the culhvated soils as a whole of China was eshmated to occur as fixedNH+4. Of the native fixed NH+4, dependent on both the Kind of parent material (rock)and the degree of weathering of the soil, from 3% to 20% can be utilized by planLThe NH+4 flxation capacity of soils of yellow brown soil zone is also the highest,while soils of latosol zone, laterihc red soil zone, grey brown desert soil zone andbrown desert zone as well as some soils in the red soil zone are unable to fix addedNH+4. Based on the differences in the amount of fixed NH+4 and its contribution tosoil N pool, as well as in the ability for fixing NH+4, soils in China except those inthe alpine and subalpine soil zones are grouped into 10 soil regions.
出处
《土壤学报》
CAS
CSCD
北大核心
2000年第2期145-146,共2页
Acta Pedologica Sinica
