Detak Jantung Pohon yang Sangat Lambat
Laser scans at night revealed that trees pulse gently every few hours, possibly pumping water through their trunks.
Before you read
Before you read
Pada malam hari, dalam keheningan total, para ilmuwan mengarahkan laser ke barisan pohon lalu menunggu. Yang mereka temukan lebih mirip hewan yang sedang tidur daripada tumbuhan: denyut lambat dan tetap, naik dan turun setiap beberapa jam, bergerak menembus seluruh pohon sekaligus.
Dahan-dahan bergeser naik turun kira-kira satu sentimeter, berirama, seolah seluruh pohon bernapas pelan. Para peneliti kini menduga batangnya sendiri mungkin aktif meremas, ikut mendorong air naik lewat saluran dalam yang disebut xilem, bukan sekadar mengandalkan penyerapan pasif. Berbeda dengan detak jantung manusia yang berulang sekitar tujuh puluh atau delapan puluh kali per menit, denyut sebuah pohon bisa butuh beberapa jam untuk satu putaran.
Aneh kalau dipikirkan: sebuah kebun penuh pohon, masing-masing berdenyut sendiri pada jadwal pribadi yang sangat lambat, benar-benar tidak terlihat kecuali kamu kebetulan mengamatinya dalam gelap dengan alat yang tepat.
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