《自然》[Nature]13年2月7日出版pdf全文

nero1981

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. t7 v+ _$ n6 uAbout the
/ {( i* @: i" p* N* j3 qCover
$ E  d- W# A; N* b7 kStretches of oak savanna $ Z+ j  U6 }0 f; \# W
in the Pacific Northwest of North America have been subject to fire-prevention - P5 e2 B6 \8 G; S% v
measures since the mid-nineteenth century. The resulting grassland has lost
5 v! I/ T) q! U% r6 O* ]. c  n/ g# mplant species but achieves stable high-yield annual production — rather like a
9 i: n3 z  N# e) n+ ?: \  Jhigh-yield agricultural system — and remains resilient to invasive species and , ~3 M$ J4 j  d6 X; H$ r; r; N1 q
climate fluctuation. A long-term study in which 8 y2 C9 c: z+ T9 v% q
selected grassland plots were periodically burned and allowed to recover now
, V  m* t+ n5 v* l  p) Qdemonstrates the critical value of biodiversity when ecosystems experience
  c0 q, j, r' N. |disturbance. Grasslands were able to recover from burning only in areas that had
$ c; r! u" ~0 B" U- l* ka relatively high diversity of native plants. This work demonstrates how * z1 ^# ^. J7 J2 Q+ k
persistent human activity can homogenize both structure and function of an
  I- y! l) W1 m* oecological system, while weakening the diversity-related mechanisms needed to
  I# Y2 J, M  U1 d% s( @compensate for sudden disturbance. There are many terrestrial systems today that + x4 s7 m1 ?$ P% {0 x& `" B
have become homogenized by persistent human activity that may be similarly
2 k( J6 C) F4 a# gvulnerable to sudden environmental change that will be only evident after the
! j/ `$ Q3 i2 Z$ }, B: Bcollapse occurs. On the cover 'grass fire' (Dariush
) [# E9 c+ I! A% n* ]5 Q9 jM/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

谢谢干细胞之家提供资料

bluesuns

我有家的感觉~~你知道吗