| 太湖地区主要土壤中的固定态铵及其有效性 |
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| 引用本文： | 文启孝,张晓华,杜丽娟,吴顺龄.太湖地区主要土壤中的固定态铵及其有效性[J].土壤学报,1988,25(1):22-30. |
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| 作者姓名： | 文启孝 张晓华 杜丽娟 吴顺龄 |
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| 作者单位： | 中国科学院南京土壤研究所;中国科学院南京土壤研究所;中国科学院南京土壤研究所;中国科学院南京土壤研究所 |
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| 摘 要： | 测定了太湖地区主要土壤中固定态铵的储量和表土的固铵能力,并通过盆栽试验研究了它们的有效性。土壤的固定态铵含量和表土的固铵能力因母质而异,长江冲积物发育的土壤最高,次为黄土状物质的,第四纪红色粘土的最低。各土壤0—20厘米土层中的固定态铵总量平均占全氮总量的18.5%,0—100厘米土体中占34%。各土壤“固有的”固定态铵的有效性差异较大,视土层等的不同,在0—13%间。“新固定”的来自肥料或土壤有机质矿化释出的铵则很高,一般均能被当季作物完全吸收利用。渍水条件并不能提高固定态铵的有效性。讨论了铵的固定作用在土壤氮素肥力中的意义;指出,由于铵的固定作用和不同土壤的固铵能力各异,常用的淹水培育法所得到的土壤氮素矿化量值不但一般偏低,而且难于进行相互比较。
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FIXED AMMONIUM IN SOILS OF TAIHU LAKE REGION AND ITS AVAILABILITY |
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| Wen Qixiao,Zhang Xiaohu,Du Lijuan and Wu Shunling.FIXED AMMONIUM IN SOILS OF TAIHU LAKE REGION AND ITS AVAILABILITY[J].Acta Pedologica Sinica,1988,25(1):22-30. |
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| Authors: | Wen Qixiao Zhang Xiaohu Du Lijuan and Wu Shunling |
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| Institution: | Institute of Soil Science, Academia Sinica, Nanjing;Institute of Soil Science, Academia Sinica, Nanjing;Institute of Soil Science, Academia Sinica, Nanjing;Institute of Soil Science, Academia Sinica, Nanjing |
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| Abstract: | The fixed ammonium content and the NH4+-fixing ability of the main types of paddy soils in Taihu lake region were determined and the availabilify of the fixed ammonium was studied under greenhouse conditions. It was found that both the fixed NH4+ content and the NH4+-fixing ability of soils varied with the parent materials, they decreased in the order:Yangtze River alluvium>loess-like material>Quaternary red clay. About 18% of the total N in the soil layer of 0-20 cm and 34% of that in the soil layer of 0-100 cm were in the form of fixed NH4+-N.The availability of ehe "native" fixed ammonium was rather low,and varied considerabiy in diferent horizons, ranging from 0 to 13%, while that of the newly fixed NH4+ was very high, berg nearly 100%. There was no evidence showing the effect of waterlogging on the availability of the fixed NH4+. The significance of NH4+-fixation in soil N,fertility is discussed, arid it is suggested that the values obtained by the submerged incubation method were not only lower than the real ones but also incomparable.-due to the presence of NH4+-fixation and difference in NH4+-fixing ability among various soils. |
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