| 民勤绿洲边缘柽柳荒漠林的时空变化及其驱动因素 |
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| 引用本文： | 马全林,王继和,刘虎俊,杨自辉,詹科杰.民勤绿洲边缘柽柳荒漠林的时空变化及其驱动因素[J].中国沙漠,2006,26(5):802-808. |
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| 作者姓名： | 马全林 王继和 刘虎俊 杨自辉 詹科杰 |
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| 作者单位： | 1.中国科学院 寒区旱区环境与工程研究所, 甘肃 兰州 730000; 2.甘肃省治沙研究所 甘肃省荒漠化防治重点实验室, 甘肃 武威 733000 |
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| 基金项目： | 国家科技攻关计划;甘肃省自然科学基金 |
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| 摘 要： | 柽柳属植物不仅是耐盐碱、耐干旱植物,同时也是最优良的防风固沙植物之一,曾在改善和维持民勤沙区生态环境中发挥了重要作用。在近40多年来,伴随民勤环境旱化,绿洲边缘柽柳荒漠林呈现出退化过程,并表现出旱生、超旱生植物增加,林带变窄,柽柳高度降低,柽柳种群及其群落盖度降低和防风固沙功能减弱等特征。目前,坝区、泉山区和湖区柽柳荒漠林均出现退化,其中坝区退化最为严重,残余宽度仅有30~75 m,依靠农田灌溉外溢水生存,是民勤绿洲边缘柽柳荒漠林发展的最终阶段。分析柽柳荒漠林时空变化的驱动因素,认为地表水消失是时空变化的诱导因素,地下水位下降和林地土壤水分减少是时空变化的主导因素,在地下水位下降到10 m的临界水位以下之前,地下水位起到主导作用;而下降到10 m以下之后,土壤水分起到主导作用。
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| 关 键 词： | 民勤 绿洲边缘 柽柳 时空变化 驱动因素 |
| 文章编号： | 1000-694X（2006）05-0802-07 |
| 收稿时间： | 2005-04-04 |
| 修稿时间： | 2005-05-29 |
Spatial-Temporal Variation and its Driving Factors of Tamarix Forestry at Edge of Minqin Oasis |
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| MA Quan-lin,WANG Ji-he,LIU Hu-jun,YANG Zi-hui,ZHAN Ke-jie.Spatial-Temporal Variation and its Driving Factors of Tamarix Forestry at Edge of Minqin Oasis[J].Journal of Desert Research,2006,26(5):802-808. |
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| Authors: | MA Quan-lin WANG Ji-he LIU Hu-jun YANG Zi-hui ZHAN Ke-jie |
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| Institution: | 1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Gansu Desert Control Research Institute, Gansu Key Laboratory of Combating Desertification,Wuwei 733000, Gansu, China |
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| Abstract: | Tamarix is not only a salt-resisting and drought-tolerating tree,but also a excellent wind-breaking and sand-fixing plant,which has ever played significant role in rehabilitating and improving the desert ecological environment of Minqin county.Tamarix ramosissima Ledeb forestry is the main Tamarix forestry at edge of Minqin oasis,which has occurred degradation along with the environment getting drought in recent 40 years.In Tamarix ramosissima Ledeb forestry,the number of xerophytes and super-xerophytes increased,the width of forestry decreased and the coverage of Tamarix ramosissima Ledeb and its community all reduced.At present,even the Tamarix ramosissima Ledeb forestry in Dam area,Spring area and Lake area all took place certain degradation.Especially,the remained width of Tamarix ramosissima Ledeb forestry in Dam area are 30~75 meters,and the forestry only live on the seeping water from farmland. As for the driving factors for spatial-temporal variation of Tamarix ramosissima Ledeb forestry,we found out that surface water vanishing is the inducing factor,groundwater table lowering and soil moisture reducing are the dominant factors. |
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| Keywords: | Minqin at edge of oasis Tamarix spatial and temporal variation driving factor |
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