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青藏高原多年冻土区土壤湿度的变化特征研究

Study on the Variation Characteristics of Soil Moisture in Permafrost Region of Qinghai-Tibet Plateau
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摘要 本文利用GLDAS四层(0~10 cm, 10~40 cm, 40~100 cm, 100~200 cm)土壤湿度数据,对青藏高原多年冻土区土壤湿度的时空变化特征进行分析。结果表明:1) 四层均从秋季开始土壤湿度逐渐降低,从春季开始,土壤湿度逐渐增大,且浅层0~10 cm土壤湿度年变化最为明显;2) 青藏高原多年冻土区春秋季土壤湿度均呈现出增加的趋势,但增加趋势不明显,浅层0~10 cm土壤湿度波动幅度最大;3) 在空间分布上,春秋季多年冻土区四层土壤湿度均呈现从西南向东北递减的分布特征,随着土壤深度的增加,土壤湿度逐渐增加;4) 空间趋势表明多年冻土区0~40 cm春季土壤湿度均呈现增加的趋势,且在浅层(0~10 cm)增加最为明显,随着土壤深度的增加,土壤湿度开始减少,其中深层(100~200 cm)土壤湿度减少最快。秋季与春季呈现相似的空间分布,但秋季100~200 cm土壤湿度减少的速率更快,尤其在多年冻土南缘附近。 Based on the soil moisture datasets of GLDAS, including four depths (0~10 cm, 10~40 cm, 40~100 cm, 100~200 cm), the spatial and temporal characteristics of soil moisture in the permafrost region over the Tibetan Plateau (TP) are analyzed. The results show that: 1) Soil moisture in the four depths gradually increase from the autumn, and gradually decrease from the spring;the soil moisture in the shallow layer (0~10 cm) has the most obvious change;2) Soil moisture in spring and autumn both has an increasing trend, although the trend is not obvious;soil moisture in the shallow layer (0~10 cm) has the maximum fluctuation;3) Soil moisture in spring and autumn display a characteristic that decreasing from southwest to northeast, and it gradually increases, as the depth of the soil increases;4) In the depth of 0~40 cm, soil moisture in spring indicates an increasing trend and the most obvious changes occur in the shallow layer (0~10 cm), as the depth of soil increases, soil moisture has a declined trend, especially in the deep layer (100~200 cm), it has a most significant decrease. In autumn, soil moisture has the same distribution, while soil moisture declines faster than that in spring, especially in the southern edge of permafrost.
出处 《自然科学》 2021年第6期1030-1037,共8页 Open Journal of Nature Science
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