| Characteristics of stem flow of young jujube tree at different reproductive periods and their relationship with environmental factors |
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| DOI：10.7606/j.issn.1000-7601.2016.05.08 |
| Key Words: Aksu area Chinese jujube growth period stem flow rate environmental factors |
| Author Name | Affiliation | | LI Hong | Xinjiang Academy of Forestry Sciences, Urumqi, Xinjiang 830000, China | | LIU Bang | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | LI Chang-cheng | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | SUN Ming-sen | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | DIAO Kai | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | HAN Ying-ying | Xinjiang Normal University, Urumqi, Xinjiang 830054, China | | CHENG Ping | Xinjiang Academy of Forestry Sciences, Urumqi, Xinjiang 830000, China | | ZHANG Zhi-gang | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | WANG Zhen-zhen | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | WU Yu | Xinjiang Normal University, Urumqi, Xinjiang 830054, China | | MIAO Qian-qian | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| A package type stem flow meter for continuous measurement of young jujube tree stem flow rate was adopted to allow synchronous monitoring four environmental factors including solar radiation, temperature, air humidity and wind speed. Stem flow characteristics of Chinese jujube at different development stages were investigated and their relationship with environment variations was also analyzed. The results showed that stem flow was active at night. Except for the stem the flow rate curve W4 that exhibited a bimodal at the fruit enlargement stage, the rest were single peak during the growth period. In addition, the cumulative amount of change in Japan curves was in an “S” shape. The average daily water consumption amount and the total water consumption were both increased firstly, and then went decreased, exhibiting marked differences. The difference was the lowest at the budding and leaf expanding stage W1, and reached the highest at the fruit enlargement period W4. The average daily water consumption amounts were 2.78 L and 8.31 L, respectively, and the total water consumption amounts were 83.39 L and 249.30 L, respectively. Furthermore, stem flow rate curve, solar radiation and temperature curve waveforms displayed almost the same varying trends, different from those of the air humidity curve waveform change trend. The partial correlation analysis between stem flow rate and environmental factors indicated that the main factors affecting the jujube tree stem flow rate varied, but the partial correlation coefficients between the highest solar radiation and the progressive growth periods were 0.767, 0.762, 0.873, 0.838, 0.603 and 0.825, respectively. By employing a multiple linear regression to study stem flow rate of Chinese jujube at different reproductive periods and environmental factors for stepwise regression, with the regression coefficient and correlation coefficient tests, the multiple linear regression equation had reached a significant level. |
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