Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (20): 4205-4215.doi: 10.3864/j.issn.0578-1752.2012.20.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Research on Vegetation Response to Temperature and Precipitation in Loess Plateau

 ZHANG  Chong, REN  Zhi-Yuan, LI  Xiao-Yan   

  1. 1.陕西师范大学旅游与环境学院，西安 710062
    2.陕西理工学院历史文化与旅游学院，陕西汉中723000
  • Received:2012-03-09 Online:2012-10-15 Published:2012-05-10

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Abstract: 【Objective】The vegetation response to temperature and precipitation in Loess Plateau was studied.【Method】EOF (Empirical Orthogonal Functions) and SVD (Singular Value Decomposition) were applied to analyze the temporal and spatial response characteristics of vegetation NDVI to the variation of temperature and precipitation, and to distinguish the spatio-temporal correlation between vegetation index and climate factors.【Result】The conditions for vegetation cover in southeast region of Loess Plateau were the best. More precipitation will be favourable to the vegetation cover, including the hydrological effect of Yellow River, but the temperature higher than one threshold value will be less good for plants in arid and semi-arid regions. Higher temperature made plants grow well where there is sufficient moisture in arid region. The vegetation cover has close relations to hydro-thermal condition in valley plain and basin valley. When there is this additional condition, the vegetation cover increases in hydro-thermal equilibrium region. There is a high level of correlation between vegetation cover and hydro-thermal condition, but more limiting factors.【Conclusion】The main limiting factors of temperature on the vegetation cover include land use, vegetation type, cropping system and landform. Loess Plateau is located in drought inland region, so precipitation has direct influence on vegetation cover. Plant growth depends on precipitation in desert zone and non-farming areas. The correlation between vegetation and precipitation is more complicated under irrigation conditions and so on in crop field.

Key words: Loess Plateau, vegetation cover, climate changes, response

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