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Relationship between Soil Moisture and Vegetation Activity in the Mongolian Steppe

机译：蒙古草原土壤水分与植被活动的关系

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References(25) Cited-By(12) Supplementary materials(1) 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).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.
机译：参考文献（25）被引用的文献（12）补充材料（1）自1950年代中期以来，干旱已在北半球广泛传播，影响了用于牲畜的蒙古草原和牧场。在这种背景下，我们根据1982-2005年蒙古草原的归一化植被指数（NDVI）数据，研究了模拟的根区土壤水分（Wm）与植被活动之间的关系。通常，NDVI的年际变化与Wm的年际变化一致。 NDVI与Wm（r = 0.91）的相关性强于与降水（P）（r = 0.65）的相关性。 NDVI的季节变化与地上生物量之间存在极强的正相关性（r = 0.94）.NDVImax高和低的年份之间的比较显示，P的显着差异导致了明显的时间滞后（约半个月） ）的差异，最后与NDVI的差异，大约有一个月的时间滞后。此外，给定年份的NDVImax值与当年的Wm值相关（r2 = 0.53），并且与当年的Wm和上一年的NDVImax的组合（r2 = 0.55）更加相关。该结果表明，在每年的基础上，植被活动主要受当年土壤水分的控制，而受根系中地下结构的影响较小。

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