• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Treatment Duration and Time since Disturbance Affect Vegetation Development in aYoung California Red Fir Plantation
【24h】

Treatment Duration and Time since Disturbance Affect Vegetation Development in aYoung California Red Fir Plantation

机译：干扰影响处理持续时间和时间对加利福尼亚州红杉人工林植被发育的影响

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The density and development of greenleaf manzanita, snowbrush, goldenbush(rabbitbrush), and graminoids were evaluated in a young California red fir plantation in northern California from 1986 through 1995. Manual grubbing and herbicides created treatments regimes that lasted for 3 to 6 years and vegetation recovery times of 4 to 10 years. The duration and timing of the grubbing and spraying operations constituted the treatments. Species response was mixed: greenleaf manzanita had higher average values of density, foliar cover, and height when time since disturbance was longest, snowbrush density was lowest but cover and height were highest, and values for goldenbrush and graminoids in general showed no trend. In the control at the end of the study, graminoids numbered 82,350 per acre, greenleaf manzanita 10,850, goldenbrush 10,800, and snowbrush 1,850 plants per acre. Foliar cover of manzanita at 7,300 square feet per acre was more than that of all other naturally estblished species combined. Survival of red fir over all teatments after one growing season was 98 percent and after 10 seasons was 89 percent. Average height of red fir seedlings ranged from 3.2 feet with intensive release to 1.7 feet with no release. No release allowed greenleaf manzanita plants to be slightly taller than red fir seedlings and to place the seedlings in danger of being overtopped.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号