| 陇东黄土高原土壤水分演变及其对气候变化的响应 |
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| 引用本文： | 杨小利.陇东黄土高原土壤水分演变及其对气候变化的响应[J].中国沙漠,2009,29(2):305-311. |
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| 作者姓名： | 杨小利 |
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| 作者单位： | 1.中国气象局兰州干旱气象研究所, 甘肃省干旱气候变化与减灾重点试验室, 中国气象局干旱气候变化与减灾重点开放试验室, 甘肃 兰州 730020; 2.甘肃省平凉市气象局, 甘肃 平凉 744000 |
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| 基金项目： | 西北地区旱作农业对气候变暖的响应特征及其预警和应对技术研究项目，甘肃省气象局十人计划 |
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| 摘 要： | 以西峰为例,利用近45 a气象观测资料和近25 a的土壤水分观测资料,分析全球气候变暖背景下陇东主要气象要素及土壤水分的变化特征,探讨了气候变化对土壤水分的影响,以及影响土壤水分变化的主要气象因素。1993年以后,土壤水分以负距平为主,土壤干旱严重,0—50 cm和60—100 cm土层土壤水分含量在1997年和1995年降到最低值。春季是土壤水分减少最明显的季节,其中表层土壤水分对气候变化的响应更为明显,而夏秋季,较深层的水分变化更为明显。影响土壤水分的气象因子以降水、蒸发为主,气温通过影响蒸发间接产生影响。通过对土壤水分演变特征及其影响因子的分析,为进一步理解土壤水分条件的恶化原因,采取措施,合理利用气候资源,调整农业生态布局,恢复生态环境,积极应对气候变化提供决策方面的参考。
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| 关 键 词： | 陇东黄土高原 土壤水分 演变 气候变化 |
| 收稿时间： | 2007-11-25 |
| 修稿时间： | 2007-12-25 |
Evolution of Soil Moisture and Its Response to Climate Change in Longdong Loess Plateau |
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| YANG Xiao-li.Evolution of Soil Moisture and Its Response to Climate Change in Longdong Loess Plateau[J].Journal of Desert Research,2009,29(2):305-311. |
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| Authors: | YANG Xiao-li |
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| Institution: | 1.Lanzhou Institute of Arid Meteorology, China Meteorological Administration; Gansu Key Laboratory of Arid Climatic Change and Reducing Disaster; Key Laboratory of Arid Climatic Change and Reducing Disaster, CMA, Lanzhou 730020, China; 2.PingLiang Meteorological Bureau, Pingliang 744000, Gansu, China |
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| Abstract: | In a case study in Xifeng on Longdong Loess Plateau, the climate change trend and its effect on soil moisture, as well as the evolution of soil moisture were analyzed based on the 45-year climate data and the 25-year observational data of soil moisture. The results show that the temperature has increased and rainfall has decreased in the recent 45 years; the soil moisture has been negative departure since 1993, and the aridity of soil was very severe. Spring is the season in which soil moisture decreases more severely, and the response of soil moisture to climate change is more obvious in 0—50 cm, while in summer and autumn it is more obvious in 60—100 cm. Entering 2000s, the seasonal change of soil moisture became more differential. The main meteorological factors influencing soil moisture are rainfall and envaporation, and air temperature influences indirectly the soil moisture through affecting evaporation. These results can help understanding the deteriorating reason of soil moisture status in the study area and can provide some references for adjusting agriculture pattern and recovering eco-environment in premise of rationally using the climatic resources. |
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| Keywords: | Longdong Loess Plateau soil moisture evolution climate change |
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