BiologyHiranyagarbha · Class 11-12

Productivity, energy flow aur pyramid: ecosystem ka hisaab-kitaab

Arjun gaon ke talaab se apne biology project ke liye paani ke namoone le raha tha. Hisaab lagaya toh dekha ki phytoplankton (sookshm paudhe) ka kul wazan unhe khaane wale zooplankton se KAM hai — phir bhi talaab saalon se chal raha hai. Usne Saxena ma'am se poocha, 'Biomass ka pyramid ulta kaise ho sakta hai?'

Ma'am ne pehle hisaab ki bhasha di. Productivity: GPP (Gross Primary Productivity) = utpaadak dwara photosynthesis se bani kul jaiv-padarth ki dar; NPP = GPP − utpaadak ka apna respiration (R). 'NPP hi woh urja hai jo upbhoktaon ko milti hai,' ma'am boli. Secondary productivity = upbhoktaon dwara naya jaiv-padarth banane ki dar. Arjun ne ikaai likhi: g/m²/saal ya kcal/m²/saal. 'Dekha? Yeh dar hai, wazan nahi.'

Arjun ne poocha ki talaab ki chain kuch hi kadam ke baad kyun ruk jaati hai. Ma'am ne energy flow (Lindeman, 1942) samjhaya: suraj ki PAR ka lagbhag 1-2% hi paudhe pakadte hain; har trophic level se agle tak lagbhag 10% (ten percent law). Urja ek disha mein — thermodynamics ke doosre niyam se har kadam par garmi ban kar nikalti hai. Isliye level 3-4 se aage pal paana mushkil. Phir ek chaunkane wali baat: detritus food chain (mare padarth → apghatak) zameen ke ecosystem mein grazing chain se zyada urja le jaati hai.

Arjun ne copy mein teen ecological pyramid banaye: number, biomass, energy. Ek bade ped par hazaaron keedon ke saath number ka pyramid ulta ho gaya; talaab mein biomass ka pyramid ulta (phytoplankton ka standing crop kam, turnover tez). Par energy ka pyramid usne kitna bhi socha, hamesha seedha raha. Ma'am ne seema bhi batayi: ek jeev kai trophic level par ho sakta hai, aur apghatak pyramid mein dikhte hi nahi.

Talaab ke kinare sadte patton ka dher tha. Ma'am ne decomposition ke paanch kadam gine: fragmentation (detritivore chhote tukde karte hain), leaching (ghulnasheel tatva mitti mein rista hai), catabolism (bacteria-fungus ke enzyme), humification (gehra, dheere tootne wala humus) aur mineralisation (humus se anjaiv poshak tatva). Arjun ne note kiya: garm-nam mausam tez, thanda-sookha dheere; lignin-chitin zyada toh dheere. Isi se padarth chakra poora hota hai.

Ghar par papa parali ka dher dekh rahe the. Arjun ne trade-off rakha: tez decomposition ka matlab poshak tatva jaldi wapas, par mitti mein carbon kam jama; dheere decomposition ka matlab carbon jama (peat, humus) par poshak tatva band. Kisaan ke liye compost aur mulch isi santulan ka khel hain. Arjun ne khet ka parali jalaane ki jagah mulch banaya — 'carbon mitti mein rahe, hawa mein nahi.'

Project ke aakhri panne par usne Bharat ki jad likhi: Taittiriya Upanishad 3.2 — 'annam brahmeti vyajanat; annad dhyeva khalvimani bhutani jayante': sab jeev anna se janmte hain, anna se jeete hain, anna mein lautte hain. Ek vyakhya mein yeh poshan-chakra ka sabse purana vaakya hai. Tum Arjun hote toh khet ke liye tez decomposition chunte ya dheema — aur kyun?

Humne kya kiya :- GPP/NPP, 10% niyam, teen pyramid aur decomposition ke paanch kadam se talaab ke ulte pyramid ki paheli hal ki.

Isse kya hua :- Samjhe ki ecosystem mein urja dhaara hai aur padarth chakra; pyramid sirf ek pal ki ginti hai, utpaadan ki dar nahi.

3 sawaal

1. NPP kya hai?
   Jawab dekho

   GPP minus utpaadak ka respiration. NPP = GPP − R; yahi urja upbhoktaon ko uplabdh hoti hai.

2. Kaunsa pyramid kabhi ulta nahi ho sakta?
   Jawab dekho

   Energy ka. Har trophic level par urja ghat-ti hai (thermodynamics ka doosra niyam), isliye energy ka pyramid hamesha seedha.

3. Decomposition mein humification kya hai?
   Jawab dekho

   Gehra, dheere tootne wala humus banna. Humification mein humus banta hai; mineralisation mein usse anjaiv poshak tatva nikalte hain.

NCERT se jodo: NCERT Class 12 Biology — ecosystem: productivity, decomposition, energy flow, ecological pyramids (idea in words)

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