4438最大成人|麻豆传媒国产AV手机在线播放|泉州市麻豆文化传媒公司|麻豆传媒md0076沈芯语在线|m麻豆传媒映画微博|yy4080香蕉视频|91制片厂制作厂|国产网红主播精品一区二区|sd肉蒲团|国产成人高清亚洲一区潘金莲,爱豆传媒网站视频资源,兔子先生第一,swag在哪看

    高級(jí)檢索

    烤煙煙田微氣候變化研究

    Microclimate Variation in Flue-cured Tobacco Fields

    • 摘要: 為了探明烤煙煙田微氣候的變化規(guī)律，利用小氣候全自動(dòng)觀測(cè)記錄儀，研究了烤煙煙田離地150 cm高處的氣溫和空氣相對(duì)濕度，5 cm、10 cm、15 cm、25 cm和35 cm土壤深度的溫度變化規(guī)律，以及20 cm深度的土壤濕度變化情況。結(jié)果表明，煙田最低氣溫出現(xiàn)在6點(diǎn)左右，最高氣溫出現(xiàn)在15點(diǎn)左右，氣溫極值出現(xiàn)時(shí)間在各個(gè)煙草生育時(shí)期差異不大，不同時(shí)期土溫極值出現(xiàn)時(shí)間比氣溫有所推遲。氣溫和土溫的日變化可用正弦曲線 進(jìn)行描述。由于受煙株蒸騰作用的影響，煙株生長(zhǎng)前期空氣相對(duì)濕度呈上升趨勢(shì)，生長(zhǎng)中期最高達(dá)（80%～90%），后期略有下降。一天中，空氣相對(duì)濕度最大值出現(xiàn)在6－7點(diǎn)，最小值出現(xiàn)在14點(diǎn)左右。土壤相對(duì)濕度在旺長(zhǎng)期最大（35%左右）。隨著煙葉采烤的進(jìn)行，煙田土壤相對(duì)濕度開(kāi)始下降，20 cm深度的土壤濕度日變化不太明顯。

       

      Abstract: Aiming at the microclimate changes in tobacco fields, full automatic recorder of microclimate was used in 2000 – 2001 to study the temperature and relative humidity (RH) at the points of 150 cm above ground, soil temperature in depth of 5cm, 10 cm, 15 cm, 25 cm and 35 cm, and RH in soil depth of 20 cm. The results indicated that the minimum and maximum air temperature occurred at 6:00 and 15:00, respectively, which changed little with the increasing growth stages, whereas the extreme value of soil temperature occurred later than that of air temperature in different growth stages. The diurnal variations on air temperature and soil temperature could be simulated by sinusoid: . Because of transpiration of tobacco plants, the air RH ascended in early stage, with peak point in middle stage, and slight descending in later stage. The maximum and minimum air RH appeared at 6:00 - 7:00 and around 14:00, respectively. Soil relative humidity reached its peak (35%) in rapid growth stages, yet descended with the increasing harvest time, while no evident changes were found in the diurnal variations on soil relative humidity.

       

      • HTML全文

    /

    返回文章
    返回