《自然》[Nature]13年2月7日出版pdf全文

nero1981

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1 R) H/ N% K3 F3 w0 T4 d$ UAbout the
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Stretches of oak savanna
' G* d% {& D( A( ain the Pacific Northwest of North America have been subject to fire-prevention ) c$ |. v# k& t% z" W5 i: s
measures since the mid-nineteenth century. The resulting grassland has lost
% s" ?6 M1 s6 j' E% j4 Dplant species but achieves stable high-yield annual production — rather like a
  O) `2 o) Q! X, ?+ ]& Jhigh-yield agricultural system — and remains resilient to invasive species and
" E6 y4 N8 }  Z, E" D$ lclimate fluctuation. A long-term study in which
* u, [# G7 f: L; nselected grassland plots were periodically burned and allowed to recover now 1 T: E& O0 L  {* l& p
demonstrates the critical value of biodiversity when ecosystems experience
$ q! u! P1 h# P" U9 H+ T3 H2 Vdisturbance. Grasslands were able to recover from burning only in areas that had ' m. X, T0 S+ V( C. z/ \; F8 H
a relatively high diversity of native plants. This work demonstrates how ' O, g0 H+ k' t; R. O! @5 I2 r2 D
persistent human activity can homogenize both structure and function of an   P# o' M5 Z8 p$ h1 Q: m# ?
ecological system, while weakening the diversity-related mechanisms needed to
/ L  T! k$ y- e5 D' _compensate for sudden disturbance. There are many terrestrial systems today that
- C( L. l5 Z7 Lhave become homogenized by persistent human activity that may be similarly
; {) }! w( f  n5 Bvulnerable to sudden environmental change that will be only evident after the 6 ^5 R3 r& H1 d3 e
collapse occurs. On the cover 'grass fire' (Dariush 6 ~  x' t/ _" C3 o" Q
M/Shutterstock).
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exin11

yuheng

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soldier

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gjchun001

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懵懂干细胞

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橙味绿茶

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bluesuns

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