| 黄土高原半干旱区沙棘林SPAC水势时空变异 |
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| 引用本文： | 刘广全,匡尚富,焦醒,周海光.黄土高原半干旱区沙棘林SPAC水势时空变异[J].国际沙棘研究与开发,2009,7(4):1-5,11. |
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| 作者姓名： | 刘广全 匡尚富 焦醒 周海光 |
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| 作者单位： | 1. 国际泥沙研究培训中心,北京,100048;中国水利水电科学研究院,北京,100048;西北农林科技大学,陕西杨凌,712100
2. 国际泥沙研究培训中心,北京,100048;中国水利水电科学研究院,北京,100048 |
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| 基金项目： | 国家科技支撑计划，水利部948项目 |
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| 摘 要： | 本文以黄土高原半干旱地区沙棘人工成林为研究对象,在SPAC系统中定位观测了沙棘林土壤水势、叶片水势和大气水势等。结果表明：天然降雨是研究区土壤水分的唯一补给来源,也是影响该区大气水势的主要环境因素,降雨量的分配具有明显的季节变化;沙棘林地土壤水势垂直分布基本呈现随土层的增加而上升的趋势;叶片水势变化趋势为早晨较高,随后下降,随着气温降低,水势又会波动回升。大气水势的日变化趋势基本相同,呈倒V字型。SPAC系统水势梯度明显,大气水势远高于树木叶片水势和土壤水势,树木叶片水势略高于土壤水势。
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| 关 键 词： | 黄土高原 半干旱区 沙棘林 SPAC系统 水势 |
Spatial and Temporal Variations on SPAC Water Potential of Seabuckthorn Stands in Semi-arid Region of the Loess Plateau |
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| Authors: | Liu Guangquan Kuang Shangfu Jiao Xing Zhou Haiguang |
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| Institution: | Liu Guangquan1,2,3,Kuang Shangfu1,Jiao Xing1,Zhou Haiguang1,2(1.International Research and Training Center on Erosion and Sedimentation,Beijing 100048,China,2.China Institute of Water Resources and Hydropower Research,3.Northwest A&F University,Yangling,Shaanxi 712100,China) |
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| Abstract: | The paper studied the spatial and temporal change on water potential of seabuckthorn stands in SPAC system in semi-arid region of the Loess Plateau,which observed the soil water potential,leaf water potential and atmosphere water potential in the artificial seabuckthorn stands.The results show that rain is only source of water compensation to soil water,and is a main element which affects atmosphere water potential.Distribution of rainfall obviously varies according to seasons.The vertical distribution of s... |
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| Keywords: | the Loess Plateau semi-arid region seabuckthorn stands SPAC system water potential |
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