| 不同放牧强度对三峡地区灌丛草地灌木重要值变化的影响 |
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| 引用本文： | 万里强,李向林,苏加楷,白静仁.不同放牧强度对三峡地区灌丛草地灌木重要值变化的影响[J].中国草地学报,2001,23(1):11-16. |
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| 作者姓名： | 万里强 李向林 苏加楷 白静仁 |
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| 作者单位： | 中国农业科学院畜牧研究所, |
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| 基金项目： | 国家“九五”重点攻关专题资助 |
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| 摘 要： | 对三峡地区灌丛草地灌木植被在山羊放牧条件下的数量特征进行了定量研究。结果表明，不同放牧强度处理区内灌木种间平均重要值的大小均存在着显著差异(P＜0.05)，各区内平均重要值最大者均为白栎，对照、轻牧和重牧区内其平均重要值分别为57.1%、51.3%和39.7%。放牧(轻牧和重牧，5月、7月和9月)期间白栎的重要值为上升趋势(除9月重牧之外)，美丽胡枝子的重要值为下降趋势(除5月轻牧之外)，水锦树的重要值为上升趋势(除9月轻牧之外)。轻牧能使白栎、麻栎、盐肤木、柳杉、美丽胡枝子、马桑和小果蔷薇的重要值增加，这说明轻牧在一定程度上能促进它们的再生，增加植冠盖度，从而提高它们在灌木群落中的优势地位。而对于某些粗蛋白质含量较高的灌木种，如宜昌木兰和黄檀等，放牧会影响其再生，故应严格控制其放牧强度才不致使其从灌木群落中衰减甚至消失。
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| 关 键 词： | 放牧强度 灌丛草地 灌木 重要值 |
| 文章编号： | 1000-6311(2001)01-0011-06 |
| 修稿时间： | 2000年4月3日 |
Influence of Grazing on
Change of Importance Values of Shrubs on a Shrubland in the Three Gorges Region of Yangtz
River. |
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| WAN Li-qiang,Li Xiang-lin,SU Jia-kai,BAI Jing-ren.Influence of Grazing on
Change of Importance Values of Shrubs on a Shrubland in the Three Gorges Region of Yangtz
River.[J].Chinese Journal of Grassland,2001,23(1):11-16. |
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| Authors: | WAN Li-qiang Li Xiang-lin SU Jia-kai BAI Jing-ren |
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| Abstract: | A quantitative study was conducted under goat stocking on characteristics of the shrubby vegetation on a shrubland in the Three Gorges Region. The results showed that there were significant differences (P＜0.05) in the average importance values (AIV) of shrubs among treatments. The AIV of Quercus fabri Hance was the highest among the shrubs for the three treatments (control, light-and heavy-stocking being 57.1%, 51.3% and 39.7% respectively). During the stocking (light-and heavy-stocking) periods of May, July and September, the IVs of Quercus fabri Hance (excepting the heavy-stocking of September) and Wendlandia uvariifolia Hance. (excepting the light-stocking of September) were on the increasing trends, while the IV of Lespedeza formosa (excepting the light-stocking of May) was on the decreasing trends. Meanwhile, the IVs of Quercus fabri Hance、Quercus acutissima、Rhus chinensis、Cryptomeria fortunei、Lespedeza formosa、Coriaria sinica and Rosa cymosa were going up on the light-stocking treatment, and this implicated that in a certain degree the light-stocking treatment may simulate their regrowth and increase their canopy cover to raise their dominancies in the shrubby community. On the other hand, the grazing would also weaken the regrowth of some shrubs which had the higher content of crude protein such as Indigofera inchangensis Craib and Dalbergia hupeana Hance., so the grazing intensity to make these shrubs not to decrease even disappear in the shrubby commnuity should be carefully controled. |
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