Periodicity
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)
- Fir
- Reasons of flowering:
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.
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Naeem Javid Muhammad Hassani is working as Conservator of Forests in Balochistan Forest & Wildlife Department (BFWD). He is the CEO of Tech Urdu (techurdu.net) Forestrypedia (forestrypedia.com), All Pak Notifications (allpaknotifications.com), Essayspedia, etc & their YouTube Channels). He is an Environmentalist, Blogger, YouTuber, Developer & Vlogger.