Evaluation of forest recovery over time and space using permanent plots monitored over 30 years in a Jamaican montane rain forest.
Evaluation of forest recovery over time and space using permanent plots monitored over 30 years in a Jamaican montane rain forest.
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在牙买加蒙塔尼雨林中使用30年来监控的永久性地块对森林恢复的评估。
DOI：
10.1371/journal.pone.0048859
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Tanner EV
中科院分区：
文献类型：
--
作者：
Chai SL;Healey JR;Tanner EV
热带森林生物多样性的保护越来越依赖于在严重的人类干扰之后的恢复。我们使用目前的相似性指数来衡量恢复的能力受到两个限制：不同大小的个体被视为平等的，指数是成比例的（与参考社区相比，每个物种的个体的两倍的社区将被评估为相同的）。我们定义了一个替代的恢复指数的树木-坦纳指数，作为平均值的数量Bray-Curtis相似性指数的物种组成的干密度和断面积。我们使用新的指数比较原始（前间隙）和间隙后组成的5个实验间隙地块（每90-100平方米）和4个控制地块超过24-35年在牙买加蓝山。经过24-35年的恢复，林隙恢复率为47%，恢复率为68%，恢复率为29%。其中4种特有种的密度和断面积下降尤为明显。结合断面积和树干密度，我们的指数减少了使用现有的相似性指数（24%-41%）获得的森林恢复的高估，从而产生更准确的估计森林保护状况。最后，我们的研究表明，这两种比较：1）随着时间的推移之间的前间隙和后间隙组成和2）在空间之间的间隙地块和空间控制（空间时间替代）产生大致相似的结果，这支持使用空间时间替代研究森林恢复的价值，至少在这个热带山地森林。
Conservation of tropical forest biodiversity increasingly depends on its recovery following severe human disturbance. Our ability to measure recovery using current similarity indices suffers from two limitations: different sized individuals are treated as equal, and the indices are proportionate (a community with twice the individuals of every species as compared with the reference community would be assessed as identical). We define an alternative recovery index for trees – the Tanner index, as the mean of the quantitative Bray-Curtis similarity indices of species composition for stem density and for basal area. We used the new index to compare the original (pre-gap) and post-gap composition of five experimental gap plots (each 90–100 m2) and four control plots over 24–35 years in the Blue Mountains of Jamaica. After 24–35 years, these small gaps surrounded by undisturbed forest had recovered 68% of the sum of per species stem density and 29% of the sum of per species basal area, a recovery index of 47%. Four endemic species were especially reduced in density and basal area. With the incorporation of basal area and stem density, our index reduces over-estimations of forest recovery obtained using existing similarity indices (by 24%–41%), and thus yields more accurate estimates of forest conservation status. Finally, our study indicates that the two kinds of comparisons: 1) over time between pre-gap and post-gap composition and 2) over space between gap plots and spatial controls (space-for-time substitution) yield broadly similar results, which supports the value of using space-for-time substitutions in studying forest recovery, at least in this tropical montane forest.
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影响因子：
8.8
作者：
Chao, A;Chazdon, RL;Shen, TJ
通讯作者：
Shen, TJ
影响因子：
3.2
作者：
Aide, TM;Zimmerman, JK;Marcano-Vega, H
通讯作者：
Marcano-Vega, H
影响因子：
2.1
作者：
DALLING, JW
通讯作者：
DALLING, JW
影响因子：
2.1
作者：
EWEL, J
通讯作者：
EWEL, J
影响因子：
3.8
作者：
Chao, A;Shen, TJ
通讯作者：
Shen, TJ