The Desertification over North China through Comparing the Long-time Variation of Air Temperature and 0 cm Soil Temperature
Received date: 2003-03-01
Revised date: 2003-07-05
Online published: 2003-12-25
Supported by
China NKBRSF Project G1999043400; Knowledge Innovation Project, CAS, No.KZCX3-SW-218
In this research, a new type of desertification index is built by using the anomalies of differences between the air temperature (Ta) and the 0cm soil temperature (Ts) over northern part (35oN north, 100oE east) of China. Depending on the data from 1956 to 2000, the most serious desertification happens over the eastern part of Northwest China (35o~45oN, 100o~110oE) in both spring and summer, which began from the 1970s, and became much remarkable from the 1980s. A tendency of desertification is also found over Northeast China (45o~52oN, 120o~135oE) from the 1990s. Although the precipitation over central North China (35o~45oN, 110o~120oE) decreased notably from 1956 to 2000, we have not found the tendency of desertification over this area. The desertification indices (Ta-Ts) over the above three areas are correlated to the precipitation very well, which indicates the key roles of precipitation to the desertification index. The high correlations between Ta-Ts and NDVI in summer of eastern part of Northwest China and both spring and summer of central North China show the feasibility of the desertification index used in this research.
Key words： air temperature; soil temperature; desertification; climate change; North China
Ailikun, GUO Weidong . The Desertification over North China through Comparing the Long-time Variation of Air Temperature and 0 cm Soil Temperature[J]. Acta Geographica Sinica, 2003 , 58(7s) : 108 -116 . DOI: 10.11821/xb20037s013
[1] Chen Jie, Gong Zitong, Gao Shangyu. Identification and analysis of root causes of desertification in semi-arid region of China. The Journal of Chinese Geography, 2000, 10(2): 108-119.
[2] UNDP. China Human Development Report: Economic Transition and the Role of Government. Beijing: China Finance and Economics Publishing House, 1999. 63-65.
[3] Wang S W, Dong G R. The evaluation of environment development in western China (Volume I): the characteristic of environment in western China and its development. Beijing: Science Press, 2002. 53-60.
[王绍武, 董光荣. 中国西部环境演变评估第一卷: 中国西部环境特征及其演变. 北京: 科学出版社, 2002. 53-60.]
[4] Ma Z G, Fu C B. Trend of surface humid index in the arid area of northern China. Acta Meteorologica Sinica, 2001, 59(6): 737-746.
[马柱国, 符淙斌. 中国北方干旱区地表湿润状况的趋势分析. 气象学报, 2001, 59(6): 737-746.]
[5] Ma Z G, Wei H L, Fu C B. Relationship between regional soil moisture variation and climatic variability over east China. Acta Meteorologica Sinica, 2000, 58(3): 278-287.
[马柱国, 魏和林, 符淙斌. 中国东部区域土壤湿度的变化及其与气候变率的关系. 气象学报, 2000, 58(3): 278-287.]
[6] Shao Y P, Henderson-sellers A. Validation of soil moisture simulation in landsurface parameterisation schemes with HAPEX data. Global Planet Change, 1996, 13: 11-46.
[7] Bai M L, Shen J G, Pei H et al. Assessment of climate change impact on desertification. Climatic and Environmental Research, 2002, 7(4): 456-464.
[白美兰, 沈建国, 裴浩等. 气候变化对沙漠化影响的评估. 气候与环境研究, 2002, 7(4): 456-464.]
[8] Field C B, Randerson J T, C M Malmstrom. Global net primary production: combining ecology and remote sensing. Remote Sensing of Environment, 1995, 51: 74-88.
/
| 〈 |
|
〉 |