| 梭梭幼苗死亡与土壤和大气干旱的关系研究 |
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| 引用本文： | 田媛,李建贵,赵岩.梭梭幼苗死亡与土壤和大气干旱的关系研究[J].中国沙漠,2010,30(4):878-884. |
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| 作者姓名： | 田媛 李建贵 赵岩 |
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| 作者单位： | 1. 新疆农业大学,林学院,新疆,乌鲁木齐,830052
2. 中国科学院,新疆生态与地理研究所,阜康荒漠生态站,新疆,乌鲁木齐,830011 |
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| 基金项目： | 国家自然科学基金，国家教育部新世纪优秀人才支持计划项目 |
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| 摘 要： | 以古尔班通古特沙漠南缘沙漠中的一年生梭梭幼苗为研究对象,对环境气象因子、土壤含水率、幼苗根系垂直伸展状况、幼苗死亡动态进行了全生长期的连续监测研究。结果表明,尽管梭梭幼苗根系伸展迅速,当年可达1.5m,幼苗死亡率动态变化仍然与土壤表层含水率显著相关,而与根区或深层含水率不显著相关。但统计分析结果显示,土壤表层含水率并不总是梭梭幼苗死亡率波动的主导因素。当土壤含水率低至0.82%时,无论大气干旱程度如何,幼苗死亡率都急剧升高;而当土壤含水率高于1.25%时,幼苗可以耐受大气干旱,幼苗死亡只与土壤表层含水率显著相关;当土壤含水率在0.82～1.25%之间时,幼苗死亡率与大气干旱程度(空气饱和差)显著相关。据此我们推测,当土壤表层含水率低于1.25%时,大气干旱主导死亡率的变化;反之,则土壤水分主导。
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| 关 键 词： | 幼苗死亡率 土壤含水率 空气饱和差 根系伸展 梭梭 |
| 收稿时间： | 2009-12-03; |
Relationship Between Haloxylon ammodendron Seedling Mortality and Water Content in Soil and Atmosphere |
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| TIAN Yuan,LI Jian-gui,ZHAO Yan.Relationship Between Haloxylon ammodendron Seedling Mortality and Water Content in Soil and Atmosphere[J].Journal of Desert Research,2010,30(4):878-884. |
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| Authors: | TIAN Yuan LI Jian-gui ZHAO Yan |
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| Institution: | TIAN Yuan1,LI Jian-gui1,ZHAO Yan2(1.Forestry College,Xinjiang Agricultural University,Urumqi 830052,China,2.Fukang Station of Desert Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Science,Urumqi 830011,China) |
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| Abstract: | Field monitoring of Haloxylon ammodendron seedling mortality, root extension, soil water content and meteorological factors during the whole growing season of first-year Haloxylon ammodendron was carried out at the southern boundary of the Gurbantunggut desert. The results showed that the Haloxylon ammodendron seedling mortality had a significant correlation with water content in surface soil, and the correlation between Haloxylon ammodendron seedling mortality and water content in deep soil wasn't signific... |
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| Keywords: | seedlings mortality soil water content vapor pressure deficit root extension Haloxylon ammodendron |
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