Relationship between Soil Moisture and Vegetation Activity in the Mongolian Steppe
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- Nandintsetseg B.
- Arid Land Research Center, Tottori University
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- Shinoda M.
- Arid Land Research Center, Tottori University
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- Kimura R.
- Arid Land Research Center, Tottori University
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- Ibaraki Y.
- Faculty of Agriculture, Yamaguchi University
抄録
Drought has become widespread throughout the Northern Hemisphere since the mid-1950s, affecting the Mongolian steppe and pastureland used for livestock. Given this background, we investigated the relationship between modeled root-zone soil moisture (Wm) and vegetation activity based on Normalized Difference Vegetation Index (NDVI) data for the Mongolian steppe during the period 1982-2005. In general, interannual change in NDVI coincided with that in Wm. NDVI showed a stronger correlation with Wm (r = 0.91) than with precipitation (P) (r = 0.65). A strong positive correlation was found between seasonal changes in NDVI and above-ground biomass (r = 0.94).<br>A comparison between years with high and low NDVImax revealed that the significant difference in P led to a significant time-lagged (about a half month) difference in Wm and finally to that in NDVI with time lags of about one month. In addition, NDVImax value of a given year was correlated with the Wm value for the current year (r2 = 0.53), and was more strongly correlated with the combination of the current year Wm and the preceding year NDVImax of (r2 = 0.55). This result suggests that on the interannual basis, the vegetation activity is primarily controlled by the current year soil moisture and slightly affected by underground structures stored in the root system.
収録刊行物
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- SOLA
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SOLA 6 29-32, 2010
公益社団法人 日本気象学会
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詳細情報 詳細情報について
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- CRID
- 1390282680198464512
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- NII論文ID
- 130004940913
- 10029543831
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- ISSN
- 13496476
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可