| Biology and Soil |
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| The Uncertainty of Response of Relative Growth Rate of H. Ammodendron Assimilation Twigs to Temperature Increment |
| QIN Hai-bo1,2, ZHENG Xin-jun1, LI Yan1, MA Jie1,2, LI Song1,2, TANG Li-song1 |
1.Fukang Desert Ecosystem Observation and Experiment Station, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract It is an indisputable that the near-surface atmospheric temperature and land surface temperature is increasing, and its trend will continue. The global warming not only changes the thermal conditions, but also changes the water conditions. The water/thermal conditions can generally reflect the potential evapotranspiration (ET0), thereby affect the productivity of vegetation. Assimilation organs of plant are the most sensitive part responding to environmental change. The study tracked the growth dynamics of the H. ammodendron assimilation twigs from June to September in 2010, measured the light-response curve to estimate the potential assimilation rate, and calculated ET0 by using meteorological data through the Hargreaves equation. The quantitative relationships among H. ammodendron assimilation twigs relative growth rate, ET0 and potential assimilation rate of H. ammodendron assimilation twigs were obtained in the research. Based on the relationships, a simple method to estimate the relative growth rate of H. ammodendron assimilation twigs only by using the data of daily average temperature, daily maximum temperature, daily minimum temperature and total solar radiation data was established, and it was tested to be feasible（P=0.016）. With the method and local meteorological data from June to September in 1960-2000, the paper discussed the uncertainty of variation direction and magnitude of H. ammodendron assimilation twigs relative growth rate in different temperature increasing modes on global warming background, and the results proved the complexity of the desert ecosystem responding to global change.
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Received: 18 January 2012
Published: 20 September 2012
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2012, Vol. 32 
