| 西藏中部退化农田土壤肥力的变化特征及其重建 |
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| 引用本文： | 蔡晓布,钱成,彭岳林,旦巴.西藏中部退化农田土壤肥力的变化特征及其重建[J].土壤学报,2004,41(4):603-611. |
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| 作者姓名： | 蔡晓布 钱成 彭岳林 旦巴 |
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| 作者单位： | 西藏农牧学院农学系,西藏,林芝,860000 |
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| 基金项目： | 国家自然科学基金项目(40061004)资助 |
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| 摘 要： | 通过田间定位试验 ,就西藏中部退化土壤化学和生物学肥力的变化等进行了研究。结果表明 ,无肥状态下土壤养分的变化具有极大的不平衡性 ,不同土层全钾、有效钾的下降速率均甚显著。有机肥 ,特别是有机—无机肥在促进土壤细菌繁殖和土壤有机质形成、改善腐殖质结构等方面具有显著作用 ,CEC、交换性盐基总量以及土壤氮、磷库容及其有效性亦呈明显提高 ,全钾、有效钾的亏缺程度逐渐下降 ,土壤氮、磷、钾的年均平衡量与其年均变化量间均呈不同程度的正相关 ,但土壤微生物区系仍处于极不协调的状态。在有机肥持续投入的基础上 ,增施氮肥、适施磷肥、重施钾肥对退化土壤的肥力恢复与重建具有重要作用
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| 关 键 词： | 土壤退化 土壤培肥 肥力演变 西藏高原 |
| 收稿时间： | 2003/9/15 0:00:00 |
| 修稿时间： | 2003/12/15 0:00:00 |
FERTILITY AND RESTORATION OF DEGRADED SOIL IN CENTRAL TIBET |
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| Cai Xiaobu,Qian Cheng,Peng Yuelin and Dan Ba.FERTILITY AND RESTORATION OF DEGRADED SOIL IN CENTRAL TIBET[J].Acta Pedologica Sinica,2004,41(4):603-611. |
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| Authors: | Cai Xiaobu Qian Cheng Peng Yuelin and Dan Ba |
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| Affiliation: | Department of Agriculture, Tibet Agricultural and Animal Husbandry College, Linzhi, Tibet 860000, China;Department of Agriculture, Tibet Agricultural and Animal Husbandry College, Linzhi, Tibet 860000, China;Department of Agriculture, Tibet Agricultural and Animal Husbandry College, Linzhi, Tibet 860000, China;Department of Agriculture, Tibet Agricultural and Animal Husbandry College, Linzhi, Tibet 860000, China |
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| Abstract: | Field experiments were carried out to investigate effects of combined application of organic manure and inorganic fertilizer on chemical and biological characteristics of the degraded soil and soil fertility restoration in Central Tibet. The results showed that changes in chemical or biological characteristics of the degraded soil were quite similar among different treatments, i.e. a declining trend for organic matter, total N and total P in the plough layer, but total K and available K in different depths of the soil profile dropped significantly in the non fertilization treatment. Processes of soil fertility restoration were not affected in the organic manure treatment. Combined application of organic manure and inorganic fertilizer had a significant and prompt effect on harmonizing the soil environment, promoting the process of bacteria dominated propagation of soil microorganism, enhancing the accumulation of soil organic matter and improving the structure of humic compounds, and increasing the pool of N, P and CEC, exchangeable bases as compared with the treatment of non fertilization. Although K was applied to the soil, K deficiency was still quite obvious in all treatments. The annual changes in soil total N, available P and available K were correlated with the annual balance of N, P and K to a varying extent, and the changes in soil nutrient contents coincided with that in nutrient balance. On the basis of continuous application of organic manure, application of an increased rate of nitrogenous fertilizer, an appropriate rate of phosphates fertilizer and a high rate of potassium fertilizer had an important promoting effect on fertility restoration of the degraded soil. |
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| Keywords: | Soil degradation Fertilization Changes in soil fertility Tibet |
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