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PANEN AIR HUJAN – POHON KOTA DI ZONE PERKERASAN

PANEN AIR HUJAN  -  POHON KOTA DI ZONE PERKERASAN

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Hambatan utama untuk membangun vegetasi pepohonan di lahan perkotaan yang diperkeras (beraspal) adalah kurangnya volume tanah yang mencukupi untuk pertumbuhan akar pohon .

Tanah di bawah trotoar biasanya dipadatkan untuk memenuhi kebutuhan menahan beban dan standar rekayasa teknis. Hal ini seringkali menghalangi pertumbuhan akar pohon ,  akan mempunyai volume tanah yang terbatas, tidak mencukupi suplai air, hara dan oksigennya.  Sehingga  pohon perkotaan yang sebagian besar akarnya berada di bawah trotoar tumbuh buruk dan biasanya mati sebelum waktu tuanya . Diperkirakan pohon perkotaan dengan kondisi lingkungan tumbuh seperti ini mempunyai umur rata-rata 7-10 tahun , padahal diharapkan pohon tersebut dapat tumbuh selama 50 tahun atau lebih  (kalau kondisi tanah tempat tumbuhnya cukup baik ). Pohon-pohon yang bertahan hidup dalam desain perkerasan seperti itu seringkali  mengganggu integritas trotoar . Pohon yang hidup lebih tua dapat menyebabkan merusak trotoar ketika akar tumbuh langsung di bawah trotoar dan tumbuh-kembang sejalan dengan umur pohon.  Rusaknya  lapisan perkerasan dapat menimbulkan bahaya .

Perbaikan trotoar seringkali mengakibatkan kerusakan akar pohon , dan mengakibatkan gangguan pertumbuhan pohon dan kematian pohon.

Suatu alat baru untuk pembentukan pohon perkotaan adalah desain ulang seluruh profil trotoar untuk memenuhi kebutuhan beban untuk instalasi perkerasan struktural , sambil mendorong pertumbuhan akar pohon menembus memasuki lapisan tanah yang lebih dalam.   Substrat trotoar baru, yang disebut ‘ tanah struktural ‘ , telah dikembangkan dan diuji sehingga dapat dipadatkan untuk memenuhi persyaratan rekayasa untuk permukaan beraspal , namun memiliki kualitas yang memungkinkan akar pohon untuk tumbuh secara leluasa ke arah  bawah dan jauh dari permukaan trotoar , sehingga mengurangi efek terangkatnya trotoar oleh akar pohon .

 

Selengkapnya lihat:

http://www.hort.cornell.edu/uhi/outreach/csc/article.html

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