| 土壤水分对流动沙丘迎风坡与丘间低地过渡带植被入侵的制约 |
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| 引用本文： | 闫守刚,许清涛.土壤水分对流动沙丘迎风坡与丘间低地过渡带植被入侵的制约[J].中国沙漠,2012,32(6):1611-1616. |
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| 作者姓名： | 闫守刚 许清涛 |
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| 作者单位： | 白城师范学院地理系,吉林白城,137000 |
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| 基金项目： | 吉林省教育厅“十二五”科学技术研究项目，吉林省高等学校大学生创新创业训练计划 |
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| 摘 要： | 在半干旱沙区植物天然更新过程中,种子萌发、幼苗出土是植物种群维持和实现更新的关键阶段。通常认为,在这一阶段,土壤水分和土壤种子库是主要制约因素。分别对流动沙丘迎风坡与丘间低地过渡带的出土幼苗密度与土壤种子库密度和土壤水分进行二元相关分析。结果表明,生长季的出土幼苗密度与土壤种子库密度的相关性未达到显著水平（P>0.05）;出土幼苗密度与土壤水分呈显著正相关（P<0.05）,而且,幼苗密度随土壤水分呈对数增加。这说明,在植被入侵流动沙丘迎风坡与丘间低地过渡带裸沙的过程中,土壤水分是主要的制约因素,而土壤种子库的制约作用则没有表现出来,植被自然恢复更多地依赖于从沙丘附近植物群落传播来的种子。
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| 关 键 词： | 流动沙丘 过渡带 土壤种子库 土壤水分 出土幼苗 |
Effect of Soil Moisture on Vegetation Invading into Transition Zone between Windward Slope of Active Dune and Interdune Lowland |
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| YAN Shou-gang,XU Qing-tao.Effect of Soil Moisture on Vegetation Invading into Transition Zone between Windward Slope of Active Dune and Interdune Lowland[J].Journal of Desert Research,2012,32(6):1611-1616. |
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| Authors: | YAN Shou-gang XU Qing-tao |
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| Institution: | Department of Geography, Baicheng Normal College, Baicheng 137000, Jilin, China |
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| Abstract: | During plant natural regeneration process in semi-arid sand area, seed germination and seedling emergence are critical stages for maintaining plant population and realizing plant natural regeneration. Soil moisture and soil seed bank are always thought to be the primary restraining factors in the critical stages. A binary correlation analysis between seedling density and soil seed bank density as well as soil moisture at transition zone between active dune and interdune lowland indicated that the correlation between seedling density and soil moisture was significantly positive in the plant growing season (P<0.05), and the seedling density increased logarithmically with the increasing of soil moisture, but the correlation between seedling density and soil seed bank density was not significant (P>0.05). The results revealed that soil moisture was a main restraining factor in seedling emergence and vegetation establishment at the transition zone between active dune and interdune lowland, while soil seed bank was not; plant natural regeneration depended more on those seeds from plant communities in neighbouring sand dunes. |
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| Keywords: | active sand dune transition zone soil seed bank soil moisture seedling |
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