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Energy conservation in horticulture can be achieved by allowing temperatures to fluctuate within predefined bandwidths instead of using rigid

set points for heating and ventilation. In temperature integration, plants are supposed to compensate effects of temporarily deviations of the average

temperature some time later by deviations in the opposite direction. However, little is still known on the effects of integration periods exceeding 1

day. In this study, effects of temperature integration on growth and development of single-stemmed cut rose plants were determined. Pruned rose

shoots were placed in climate chambers in which light levels switched daily (2 days integration period) or weekly (14 days integration period) from

high light intensity (300 umol m-2- s-t) to low light (150 umol m-2 s- 1). Temperatures were kept continuously at 20 ~C (control) or changed with

the light intensity (phase, high temperature at high light intensity, low temperature at low light intensity) or changed opposite to the light intensity

(counter phase). Bandwidths of temperature integration were 0, 6 or 10 ~C. Under these conditions, buds grew out to harvestable shoots in

approximately 45 days. At both integration periods, shoot length was significantly reduced with increasing bandwidths of temperature integration.

Shoot dry weights were reduced when a bandwidth of I0 ~C was applied. At both integration periods, rates of photosynthesis were primarily

determined by light intensity. However, in the counter phase treatments, photosynthesis rate at high light and low temperature was reduced

compared to the high light condition of the control. Under these: conditions, starch content increased to approximately 10%, suggesting a feedback

inhibition of the rate of photosynthesis. However, this did not (yet) affect plant growth or development.

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  • 1 0 年前
    最佳解答

    此段大綱如下:

    以能源節約作實驗ㄉ情況下....

    在溫度綜合化ㄉ差異性....

    以及是否影響生長與發展....

    以上....

    雖然我不懂裡面ㄉ真諦....

    但是我了解裡面ㄉ意思是在說明以玫瑰做實驗ㄉ開端....

    作出差異性以及日後ㄉ發展....

    希望能夠幫助你....

    go go 加油

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