Periodicity

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PERIODICITY

  • Periodicity is the regular cycle of flowering/ seeding.
  • It is the interval b/w flowering and fruiting.
  • The frequency of flowering varies greatly with spp, weather, age and size of trees, and with canopy and crown class.
    • Reasons of flowering:
      • Genetic characteristics
      • Environmental factors
      • Soil fertility
      • Soil moisture
      • Soil nutrients (the yr in which soil has nutrients, tree will produce flowers)
    • Examples of spp
      • Fir
        • Average cycle for moderate seed year = 6 yrs
        • For good seed yr = 10 yrs
      • Deodar
        • Moderate seed year = 3 yrs
        • Good seed year = 4 – 5 yrs
      • Spruce
        • M s yr = 3
        • G s yr = 5 -6
      • Chir
        • M s yr = 3
        • G s yr = 4 -5
      • Kail
        • M s yr = 2
        • G s yr = 2 – 3
      • Shisham
        • M s yr = 1
        • G s yr = 1
      • Acacia
        • M s yr = 1
        • G s yr = 1-2
      • Majority of the spp are bisexual (both sexes are present)
      • Conifers, etc are monosexual (separate sexes)

Bamboos produce flowers once in life usually after 40 years but if rhizomes are planted they may produce flowers after 10 years and this is called classical periodicity.

Image: Womanadvicesforlife


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Naeem Javid Muhammad Hassani

NJMH is working as Deputy Conservator of Forests in Balochistan Forest & Wildlife Department (BFWD). He is the CEO of Tech Urdu (techurdu.net) Forestrypedia (forestrypedia.com), Majestic Pakistan (majesticpakistan.pk), All Pak Notifications (allpaknotifications.com), Essayspedia, etc & their YouTube Channels). He is an Environmentalist, Blogger, YouTuber, Developer & Vlogger.

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