[1]ZHANG Weimin,WANG Jinghong.Variation Characteristics of the Accumulated Temperature of Jujube Planting Zones in the Hilly Region of the Loess Plateau over the Past 40 Years[J].Research of Soil and Water Conservation,2016,23(06):232-237.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
23
Number of periods:
2016 06
Page number:
232-237
Column:
Public date:
2016-12-28
- Title:
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Variation Characteristics of the Accumulated Temperature of Jujube Planting Zones in the Hilly Region of the Loess Plateau over the Past 40 Years
- Author(s):
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ZHANG Weimin, WANG Jinghong
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Shaanxi Meteorological Service Observatory for Economical Crops, Xi’an 710014, China
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- Keywords:
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accumulated temperature; variation tendency; mutation; Morlet wavelet analysis
- CLC:
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P467
- DOI:
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- Abstract:
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In order to understand the variation characteristics of accumulated temperature of jujube planting zones in the hilly region of the Loess Plateau and provide decision basis for distribution and scientific management of jujube, based on the daily temperature in twelve weather stations of the jujube planting zones in the hilly region of the Loess Plateau from 1971 to 2010, we analyzed the variation characteristics of ≥ 0℃, ≥ 5℃, ≥ 10℃accumulated temperatures and negative accumulated temperature change by means of linear trend estimates, M-K test and Morlet wavelet analysis. The results indicated that the ≥ 0℃, ≥ 5℃, ≥ 10℃ accumulated temperatures showed an increasing trend over 40 years and they are increasing significantly by 64.557℃/decade, 66.235℃/decaced and 48.023℃/decade, respectively. The negative accumulated temperatures decreased by 33.759℃/decade. The lasting days of accumulated temperature have increased too, the trend of beginning dates of accumulated temperatures appeared ahead. On the other hand, the ending dates were delayed except ≥ 10℃ accumulated temperature. The main boundary temperature had an obvious warming mutation, the negative accumulated temperature changed at the earliest abruptly in 1986, followed by ≥ 0℃ accumulated temperature(1995), ≥ 5℃, ≥ 10℃ accumulated temperatures(1996). The main boundary temperature was fluctuating periodically with the variation of temporal scale, with 2~4,9~11,32~33 years fluctuation. The accumulated temperature of the main boundary and the lasting days had increasing trend and the heat resources improved significantly, the suitability areas for jujube expanded, but effective measures need to be taken for preventing the drought disaster and insect pests and diseases.