| Temporal and spatial variation analysis of water and irrigation requirement index of rice in central Yunnan Province under climate change |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2020.05.32 |
| Key Words: rice water requirement irrigation water requirement index spatial and temporal variability central Yunnan Province |
| Author Name | Affiliation | | CAO Yan | Yunnan Institute of Water Resources and Hydropower Research, Kunming, Yunnan 650228,China | | WANG Jie | Yunnan Institute of Water Resources and Hydropower Research, Kunming, Yunnan 650228,China | | WANG Shupeng | Yunnan Institute of Water Resources and Hydropower Research, Kunming, Yunnan 650228,China | | HUANG Ying | Yunnan Institute of Water Resources and Hydropower Research, Kunming, Yunnan 650228,China | | ZHANG Lei | Yunnan Institute of Water Resources and Hydropower Research, Kunming, Yunnan 650228,China | | LI Youliang | Yunnan Institute of Water Resources and Hydropower Research, Kunming, Yunnan 650228,China |
|
| Hits: 764 |
| Download times: 434 |
| Abstract: |
| Based on the daily meteorological data from 48 meteorological stations during 1961-2013 and rice growth observation data from 5 rice irrigation experimental stations during 2014-2018 in the central Yunnan Province, the crop water requirement (ETc), effective precipitation (Pe), irrigation requirement (IR), and irrigation requirement index (IRI) in the central Yunnan Province with 53 years (1961-2013) were calculated by using the Penman-Monteith equation and single crop coefficient method, the temporal and spatial variation of ETc, Pe, IR, and IRI during rice growth season in different regions were analyzed by the linear trend estimate and M-K method. The results showed that the average ETc, Pe, IR, and IRI during rice growth season were 546.34 mm, 235.96 mm, 310.38 mm, and 0.57, respectively. The ETc and Pe significant decreased with a decreasing rate of 4.358 mm·decade-1 and 6.468 mm·decade-1. The IR and IRI had increased with an increasing rate of 1.2 mm·decade-1 and 0.8%·decade-1. The ETc decreased mainly in Dianzhong I-2 and Xerothermal valley Ⅵ. The Pe decreased mainly in Dianzhong I-3 and Dianzhong I-4, and the increased IRI mainly in Dianzhong I-3 and Dianzhong I-4. The significant variation of ETc, Pe, and IRI were mainly occurred in the heading flowering, tillering, and milk stages. The ETc of rice in the central Yunnan Province from 1961 to 2013 was represented as tillering stage > heading flowering stage > milk stage > jointing booting stage > returning green stage > yellow ripening stage. The Pe was ranked as heading flowering stage >tillering stage >jointing booting stage >milk stage > returning green stage > yellow ripening stage. The IRI was ranked as returning green stage >tillering stage > yellow ripening stage>milk stage >jointing booting stage >heading flowering stage. The ETc showed high value in the north central region and the low value in the east central region in different growth periods of the rice. The areas with great decrease of ETc in the different growth periods of the rice was mainly concentrated in the north central region, and the areas with great increase of ETc was mainly concentrated in the east central region. The Pe and IRI had the opposite characteristics. The most positive and negative correlation factors for ETc,IR, and IRI of rice was Pe. |
|
|
|