| 研究论文 |
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| Evapotranspiration Characteristics of Soil Microbiotic Crusts |
| HE Ming-zhu1,2, LI Xin-rong1， ZHANG Jing-guang1, ZHOU Hai-yan1， JIN Wen-jie3， ZHANG Zhi-shan1 |
| 1.Shapotou Desert Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Graduate School, Chinese Academy of Sciences, Beijing 100039, China; 3.School of Life Sciences, Agricultural University of Gansu, Lanzhou 730070, China |
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Abstract Soil microbiotic crusts play important roles in vegetation restoration and revegetation in desert area. Evapotranspiration value and transpiration indexes of the three types of soil microbiotic crust under different water content (including Bryum argenteum crust, Didymodon nigrescens crust and algal crust) were measured. The results showed that: ①Diurnal changes of evapotranspiration of the three different soil microbiotic crusts were “single-peak pattern”, peak value and changes of evapotranspiration value among different treatments had great difference. Control experiment of Bryum argenteum crust reached its peak value at 11:00. Diurnal evapotranpiration changes of Bryum argenteum crust and Didymodon nigrescens crust were accordant. At 17:00, evapotranspiration values of Bryum argenteum crust and Didymodon nigrescens crust were -0.009 g/10cm2 and -0.010 g/10cm2 respectively, which indicated that the two crusts began to absorb condensed water; ②Diurnal change curve of transpiration rate of Bryum argenteum crust was inapparent “double-peak pattern”, which showed “noon break” of two crusts. Diurnal change curve of other two crusts taken on “single-peak pattern” and the time peak values appeared was postponed as water content declined; ③Stomatal resistance negatively correlated with transpiration rate(TR); ④Correlation between transpiration rate and its factors was analyzed, results indicated that light intensity and air flow remarkably affected TR of crusts and stomatal resistance and relative humidity negatively correlated with TR.
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Received: 01 January 1900
Published: 20 March 2006
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2006, Vol. 26 
