A conceptual model of changes in root cohesion in response to vegetation management.
A conceptual model of changes in root cohesion in response to vegetation management.
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DOI：
10.2134/jeq1991.00472425002000010009x
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发表时间：
1991
影响因子：
2.4
通讯作者：
R. Sidle
中科院分区：
文献类型：
--
作者：
R. Sidle
植物根系提供的粘聚力是决定容易发生浅层滑坡的植被陡坡稳定性的重要因素。植被去除对根系凝聚力的影响可以通过两种函数关系来模拟：(i) 根系退化，如指数衰减函数所描述；(ii) 新种植或入侵植被的再生，如 S 形关系所描述。这些同时发生的功能的速率决定了净生根强度的时间变化。本文开发的一般根系强度模型适用于特定的造林系统，例如皆伐、部分砍伐、防护林砍伐和间伐。该模型通过将先前植被去除的影响叠加到最近去除的影响来模拟植被管理对根系凝聚力的长期影响。针对特定造林系统提供的例子表明，促进根系强度快速退化和缓慢再生的植被和立地条件可能会在几次管理轮换中降低净根系强度。逐渐缩短割草或部分割草轮作可能会导致根部强度暂时下降。初始和最终防护林插条之间较长的间隔比较短的间隔可以提高生根强度。来自山间研究站（Ogden, UT 84401）的贡献。
Cohesion contributed by plant root systems is an important factor in determining the stability of steep, vegetated slopes subject to shallow landslides. The effects of vegetation removal on root cohesion can be simulated by two functional relationships: (i) root deterioration as described by an exponential decay function and (ii) regrowth of newly planted or invading vegetation as described by a sigmoid relationship. The rates of these simultaneous functions determine the temporal changes in net rooting strength. The general root strength model developed in this paper is adapted to specific silvicultural systems such as clearcutting, partial cutting, shelterwood cutting, and thinning. The models simulate the long-term effects of vegetation management on root cohesion by overlaying the impacts of a prior vegetation removal on a more recent removal. Examples presented for specific silvicultural systems indicate that vegetation and site conditions that promote rapid root strength deterioration and slow regrowth may depress net rooting strength over several management rotations. Progressively shorter clearcut or partial cut rotations can cause a steady temporal decline in root strength. Longer intervals between initial and final shelterwood cuttings promote greater rooting strength than short intervals. Contribution from the Intermountain Research Station, Ogden, UT 84401.