Sampling Techniques Influence Understory Plant Trajectories After Restoration: An Example from Ponderosa Pine Restoration
Sampling Techniques Influence Understory Plant Trajectories After Restoration: An Example from Ponderosa Pine Restoration
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采样技术影响恢复后林下植物的轨迹：以黄松恢复为例
DOI：
10.1046/j.1526-100x.2003.rec0170.x
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
P. Fulé
中科院分区：
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作者：
J. Korb;W. Covington;P. Fulé
摘要虽然目前还没有一种正确的植被取样技术，但取样设计的选择可能会极大地影响研究人员从恢复措施中得出的结论。设计植被采样协议时的考虑因素包括确定要测量的采样属性、采样地块的大小和形状、重复的数量及其在研究区域内的位置以及采样频率。我们在处理和对照单元中安装了20个点截距样带（50 m长），8个带状样带（10 × 50 m），10个适应性Daubenmire样带（4个0.5 × 2 m地块）和4个改良的Whittaker地块（20 × 50 m，具有较小的嵌套地块），以测量林下草本植物在森林恢复实验中的响应，该实验测试了不同的处理。对于所有对照和处理单元，点截距样带平均记录的植物覆盖至少是在相同位置采集的适应Daubenmire样带和改良Whittaker样地的两倍。与样带和改良惠特克图相比，点截距样带和改良Daubenmire图在对照和处理单元中捕获的稀有和外来物种平均较少。改良的惠特克图在所有单位中捕获了最高的物种丰富度。早期连续林下对恢复处理的反应可能被草本群落对年度气候变化（干旱年与湿润年）的反应所掩盖。物种丰富度和丰富度均高于丰水年比干旱年的所有控制和治疗单位。我们的研究结果表明，采样技术可以极大地影响林下植物轨迹的看法，因此恢复目标是否已经实现的解释。此外，我们的研究结果表明，恢复监测需要进行足够长的时间，以便恢复治疗反应可以检测到。
Abstract Although there is no one correct technique for sampling vegetation, the sampling design chosen may greatly influence the conclusions researchers can draw from restoration treatments. Considerations when designing vegetation sampling protocol include determining what sampling attributes to measure, the size and shape of the sampling plot, the number of replicates and their location within the study area, and the frequency of sampling. We installed 20 point‐intercept transects (50‐m long), 8 belt transects (10 × 50 m), 10 adapted Daubenmire transects (four 0.5 × 2‐m plots), and 4 modified‐Whittaker plots (20 × 50 m with smaller nested plots) in treatment and control units to measure understory herbaceous response in a forest restoration experiment that tested different treatments. Point‐intercept transects on average recorded at least twice as much plant cover as did adapted Daubenmire transects and modified‐Whittaker plots taken at the same location for all control and treatment units. Point‐intercept transects and adapted Daubenmire plots on average captured fewer rare and exotic species in the control and treatment units in comparison with the belt transects and modified‐Whittaker plots. Modified‐Whittaker plots captured the highest species richness in all units. Early successional understory response to restoration treatments was likely masked by the response of the herbaceous community to yearly climatic variation (dry vs. wet years). Species richness and abundance were higher in wet years than dry years for all control and treatment units. Our results illustrate that sampling techniques can greatly influence perceptions of understory plant trajectories and therefore the interpretation of whether restoration goals have been achieved. In addition, our results suggest that restoration monitoring needs to be conducted for a sufficient length of time so that restoration treatment responses can be detected.
长泽 H.：生命科学。
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