ParyavaranHiranyagarbha · Class 11-12
Secondary grasslands: sau saal ka recovery-gap aur restoration ka trade-off
Agar grassland dobara ug bhi jaaye, toh kya woh ecologically puraane jaisa maana jaaye — aur policy ko kya rokna chahiye?
Socho pehle… phir dekho jawab
Nahi. PNAS adhyayan (742 paudhon ki kismon par) dikhata hai ki secondary grasslands mein paudhe lambe aur kam sansaadhan bachane wale hote hain, kism kam hoti hai aur weedy annuals aa jaate hain — kyunki mitti ke poshak tatva aur pH badal chuke hote hain.
Mechanism: puraane grasslands ke paudhe resource-conserving hote hain — poshak tatva bachane wale. Ujadne se mitti ke nutrients aur pH badalte hain, isliye recolonisation mein resource-acquiring, lambe aur bahar ke weedy annuals aa jaate hain. Isse species diversity ghatti hai aur community sau saal se zyada mein bhi wapas nahi banti.
Data: adhyayan mein Bharat, Australia aur Brazil ke savanna aur US ke prairies ke 742 paudhon ki tulna hui. Grasslands duniya ke zameeni carbon ka lagbhag ek-tihai sambhaalte hain, aur India mein duniya ke lagbhag 15% pashu lagbhag 4% zameen par hain — charagaah par dabaav asli hai.
Trade-off: restoration aanshik kaam karta hai — Solapur mein Godawan, Kutch mein lesser florican, Assam ke Orang mein pygmy hog laute — par paudhon ka asli samuday wapas nahi aata, isliye bachana pehle. Afforestation targets pedon ko inaam dete hain, jabki ghaas ke maidan mein ped lagana ghaas ko chhaya mein daba sakta hai. Par kuch grasslands bigde jungle bhi hote hain, isliye classification site-specific hi honi chahiye.
Ghar pe try karo
Ek short answer likho (100 words): 'Solar park ke liye khuli ghaas ka allotment karne se pehle kaun se 3 sawaal poochhne chahiye?' Phir ek line: restoration aur protection mein farak kya hai?
Wow!
Adhyayan ke mutabik jo ghaas ke maidan hazaaron saal mein bane, woh sau saal mein bhi apni puraani shakl nahi le paate!
3 sawaal
- Secondary grasslands mein kaun sa badlav dekha gaya?
Jawab dekho
Kam kism, lambe paudhe aur weedy annuals. Adhyayan ke mutabik secondary grasslands mein kism kam hoti hai aur weedy annuals zyada.
- Secondary grasslands mein yeh badlav kyun aata hai?
Jawab dekho
Kyunki mitti ke nutrients aur pH badal chuke hote hain. Ujadne se mitti ke nutrients aur pH badalte hain.
- Afforestation targets ka grassland par kya khatra hai?
Jawab dekho
Ped ghaas ko chhaya mein daba sakte hain. Ped ghaas ko chhaya mein daba sakte hain, isliye site-specific classification zaroori hai.
NCERT se jodo: NCERT Class 11 Geography — jeevmandal (biosphere) aur paryavaran; NCERT Class 12 Biology — ecosystem