检索结果-南通市图书馆

Aridity/humidity status of land surface in China during the last three decades

Science China Earth sciences 2005年第9期48卷 1510-1518页

作者： wu shaohong1. {2. yunhe1.2. zheng du1.& yang qinye1.1. Institute of geographical sciences and natural resources {12., chinese academy of sciences (CAS), Beijing 1.01.1. China 2. Graduate School of the CAS, Beijing 100039, China 1. Institute of geographical {1. and natural resources research Chinese Academy of Sciences (CAS) 100101 Beijing China 2. Graduate School of the CAS 100039 Beijing China

To clarify aridity/humidity status of land surface is helpful for studying environmental background and regional differences, seeking causes of environmental change, and providing a scientific basis for {1.es on climate change in the future. In this paper, the authors calcu- lated potential evapotranspiration of China using data from 61. meteorological stations during the period of 1.71.2000 with the Penman-Monteith model recommanded by FAO in 1.98. Vy- sothkii’s model was used to calculate aridity/humidity index. Then the calculated results of sta- tions were interpolated to land surface using ArcGIS. Results show that the annual average po- tential evapotranspiration is 400―1.00 mm in the whole country, 600―800 mm in most parts of it; and 350―1.00 mm in growing season (April―Octobor), which is nearly 2.0 mm less than the annual average. According to the aridity/humidity indexes of 1.0, 1.5 and 4.0, the aridity/humidity status is categorized to four types, namely, humid, subhumid, semiarid and arid. A majority of stations (76%) are more humid in growing season than the annual average. Results of com- prisons between the distribution map of aridity/humidity index with that of precipitation and vegetation indicate a good consistence of aridity/humidity status with natural environment. Therefore potential evapotranspiration calculated with modified FAO’s Penman-Monteith model in combination with aridity/humidity index that considers water balance can more reasonably explain the actual land surface aridity/humidity status of China.

关键词： potential evapotranspiration, aridity/humidity status, land surface, regional differences, Penman-Monteith.

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