| 摘要: |
| [目的]揭示子午岭林区土地退化/恢复过程中土壤质量演变及其与土壤侵蚀的关系.[方法]采用野外调查和室内分析相结合的方法,对陕西省富县任家台林场子午岭林区土地退化/恢复过程中,土壤水稳性团聚体和有机质的动态变化规律进行了系统研究.[结果]土地退化过程中,土壤中＞0.25 mm水稳性团聚体含量减少;土地恢复过程中,土壤中＞0.25 mm水稳性团聚体含量增加;土壤有机质含量随开垦/恢复年限的增加而减小/增大;土壤有机质含量与＞0.25 mm土壤水稳性团聚体含量之间存在着显著的正相关关系;土壤水稳性团聚体平均质量直径随着土壤中＞0.25 mm水稳性团聚体含量或退耕年限的增加而增大.[结论]土地开垦,土壤水稳性团聚体含量减少,土壤结构稳定性被破坏,调控能力减弱,土地恢复,土壤水稳性团聚体含量增加,平均质量直径增大,稳定性增强,土壤结构得到改善. |
| 关键词: 土壤有机质 水稳性团聚体 土地退化/恢复 子午岭林区 |
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| 基金项目:国家重点基础研究发展计划项目“中国主要水蚀区土壤侵蚀过程与调控研究”（2007CB407206）；国家自然科学基金项目“坡面侵蚀输沙动力过程实验研究”（40371075）；西安理工大学优秀博士生科研基金（2007-210009） |
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| Dynamics of water stable aggregate in land degradation/restoration process of Ziwuling forest farm |
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| Abstract: |
| 【Objective】 This research is to study the devolvement of soil quality during degradation and restoration.【Method】 Based on the field investigation and indoor analysis，dynamics of soil water stable aggregate in land degradation/restoration process in Renjiatai forest farm was studied.【Result】 Results indicated that in the process of reclamation,soil organic matters and >0.25 mm water stable aggregate tended to decrease,while during restoration,soil organic matters and >0.25 mm water stable aggregate increased.Between soil organic matters and >0.25 mm water stable aggregate,there was a positive linear relationship.Mean-weight diameter of soil water stable aggregate increased corresponding with the content of >0.25 mm soil water stable aggregate or restoration years.【Conclusion】 Land reclamation destroys soil water stable aggregates and their stability,and land restoration augments the mean-weight diameter of soil water stable aggregate through increasing soil water stable aggregate contents and its stability,thus soil structure is improved. |
| Key words: soil organic matter water stable aggregate land degradation/restoration Ziwuling forest farm |
