Resin flow was measured in red-cockaded woodpecker (Picoides borealis Vieillot) clusters in longleaf pine (Pinus palustris Mill.) in the southern region of the Angelina National Forest, Texas. Resin flow (ml) at 1.4 m...Resin flow was measured in red-cockaded woodpecker (Picoides borealis Vieillot) clusters in longleaf pine (Pinus palustris Mill.) in the southern region of the Angelina National Forest, Texas. Resin flow (ml) at 1.4 m height over 24 hrs was measured from one 2.5 cm punch through the phloem between 0700 and 1000 hrs from March 1999 to September 2000, for a total of 9 measurements per tree. Resin was sampled in naturally active cavity trees, artificial (insert) active, natural inactive, artificial inactive and control pines (84 sample trees). Resin flow pattern was significantly different during the year, but not significantly different in the cavity tree type resin flow. Cavity trees in the 90th percentile (>33.0 ml resin in 24 hrs) were defined as super resin producing. High average resin flows in August 1999 and September 2000 indicate when to sample resin for potential cavity trees. Regression equations were produced to estimate future resin production.展开更多
空心树是森林生态系统的重要结构,在维持森林动物群落(尤其是树栖动物)的物种多样性方面起着一定作用。基于Web of Science数据库,利用CiteSpace软件分析了空心树领域的研究现状和趋势。结果表明:该领域的年发文量呈快速增长趋势;澳大...空心树是森林生态系统的重要结构,在维持森林动物群落(尤其是树栖动物)的物种多样性方面起着一定作用。基于Web of Science数据库,利用CiteSpace软件分析了空心树领域的研究现状和趋势。结果表明:该领域的年发文量呈快速增长趋势;澳大利亚在发文量、研究机构、研究学者等方面都远远超过其他国家,而中国在该领域则相对较弱;过去的研究集中在对空心树分配格局和形成原因的探讨,目前多集中在空心树对生物多样性保育作用等方面。随着生物多样性保护重要性的日益突现,有关空心树的研究逐渐向生物多样性方向发展,因此建议今后对空心树的研究应与生物多样性保护相结合,可为森林生物多样性的保护和管理提供依据。展开更多
文摘Resin flow was measured in red-cockaded woodpecker (Picoides borealis Vieillot) clusters in longleaf pine (Pinus palustris Mill.) in the southern region of the Angelina National Forest, Texas. Resin flow (ml) at 1.4 m height over 24 hrs was measured from one 2.5 cm punch through the phloem between 0700 and 1000 hrs from March 1999 to September 2000, for a total of 9 measurements per tree. Resin was sampled in naturally active cavity trees, artificial (insert) active, natural inactive, artificial inactive and control pines (84 sample trees). Resin flow pattern was significantly different during the year, but not significantly different in the cavity tree type resin flow. Cavity trees in the 90th percentile (>33.0 ml resin in 24 hrs) were defined as super resin producing. High average resin flows in August 1999 and September 2000 indicate when to sample resin for potential cavity trees. Regression equations were produced to estimate future resin production.
文摘空心树是森林生态系统的重要结构,在维持森林动物群落(尤其是树栖动物)的物种多样性方面起着一定作用。基于Web of Science数据库,利用CiteSpace软件分析了空心树领域的研究现状和趋势。结果表明:该领域的年发文量呈快速增长趋势;澳大利亚在发文量、研究机构、研究学者等方面都远远超过其他国家,而中国在该领域则相对较弱;过去的研究集中在对空心树分配格局和形成原因的探讨,目前多集中在空心树对生物多样性保育作用等方面。随着生物多样性保护重要性的日益突现,有关空心树的研究逐渐向生物多样性方向发展,因此建议今后对空心树的研究应与生物多样性保护相结合,可为森林生物多样性的保护和管理提供依据。
