This paper reports the population and distribution of Selenarctos thibelanus in the Minshan mountains of Sichuan in 1998.Five surveyed counties (cities) occupy 40.1% of total area.The analysis indicates that the avera...This paper reports the population and distribution of Selenarctos thibelanus in the Minshan mountains of Sichuan in 1998.Five surveyed counties (cities) occupy 40.1% of total area.The analysis indicates that the average density of Selenarctos thibelanus is 0.0214～0.0289km 2,and the average number of Selenarctos thibelanus is estimated as 395 in the Minshan mountains.The distribution center of Selenarctos thibelanus is Qingchuan,Beichuan and southeast of Pingwu.The density gradually decreases from the center towards all directions.展开更多
资源的时空分布不均是野生动物形成季节性生境利用策略的主要动力。这种策略的形成为它们在环境波动时创造了生存机会。岩羊(Pseudois nayaur)主要分布在青藏高原,以草甸、流石滩生境为主要栖息地类型,而位于分布边缘的岩羊存在对森林-...资源的时空分布不均是野生动物形成季节性生境利用策略的主要动力。这种策略的形成为它们在环境波动时创造了生存机会。岩羊(Pseudois nayaur)主要分布在青藏高原,以草甸、流石滩生境为主要栖息地类型,而位于分布边缘的岩羊存在对森林-草甸交错区的利用情况。为了解岩羊边缘种群的空间利用特征和季节变化,并探究环境结构与物种分布的关系,本研究于2018年6月至2019年8月在四川王朗国家级自然保护区开展红外相机调查,根据监测结果利用列联表卡方检验、Bonferroni法和Post hoc testing检验综合分析岩羊在森林-草甸交错生境中活动的季节性特征。结果表明:1)岩羊在不同生境中的季节性活动强度存在极显著差异(χ^2=503.50,df=6,P<0.05)。2)从不同生境的活动强度季节性变化看,岩羊在草甸的活动,以春季最强(活动频率44.4%,标化残差10.6),夏季最弱(5.3%,-17.4);在林缘的活动,以夏季最强(54.0%,6.6),秋季最弱(30.2%,-9.1);在林内的活动,以夏秋强(夏:40.7%,8.4;秋:45.0%,8.0),春季最弱(3.8%,-11.7)。3)从不同季节生境的活动强度判断,岩羊在夏、秋两季的活动多出现在林内(夏:45.9%,8.4;秋:26.8%,8.0),而冬、春两季的活动更多在草甸(春:20.6%,10.6;冬:49.4%,9.1),岩羊在夏季也较多出现在林缘(41.5%,6.6)。本研究结果显示,岷山北部的岩羊在夏、秋季对针叶林存在较多的季节性利用,可能与躲避高温有关。在全球气候变暖的背景下,高海拔地区气温与降水的显著变化将导致高山林线出现明显的交错和进退,进而影响着众多依赖森林和草甸生境生存的物种的分布。展开更多
To determine the effects of eco-factors on the regeneration of arrow bamboo in giant panda habitat,a field study was conducted in the Baozuo and Gonggangling Nature Reserves,Sichuan Province,China.A total of 183 quadr...To determine the effects of eco-factors on the regeneration of arrow bamboo in giant panda habitat,a field study was conducted in the Baozuo and Gonggangling Nature Reserves,Sichuan Province,China.A total of 183 quadrats(10 m×10 m) and 717 small quadrats(1 m×1 m) were investigated within the study site.Bamboo seedling density was used as an indicator of natural regeneration.Twelve factors were measured,which included topography and forest factors(elevation,slope aspect,slope degree,slope position,canopy cover,and shrub cover) and microhabitat factors(upper vegetation cover,herb cover,litter layer cover,moss cover,moss thickness,and dead bamboo density).A One-Way ANOVA was used to analyze the effects of topography and forest factors on seedling density,and a GLM(Generalized Linear Model) procedure was performed to examine the relationship between seedling density and microhabitat factors.The results indicated that elevation and canopy cover had highly significant effects on seedling density:bamboo seedling density was highest and showed the best regeneration at middle elevations(2800-3000 m) and under medium to medium-high canopy cover.Moss thickness,moss cover,and dead bamboo density were the most important microhabitat factors influencing the natural regeneration of bamboo:seedling density increased with increasing moss cover and moss thickness and decreased with increasing dead bamboo density.We propose that removal of dead bamboo and controlling grazing activities may accelerate the process of bamboo regeneration.展开更多
文摘This paper reports the population and distribution of Selenarctos thibelanus in the Minshan mountains of Sichuan in 1998.Five surveyed counties (cities) occupy 40.1% of total area.The analysis indicates that the average density of Selenarctos thibelanus is 0.0214～0.0289km 2,and the average number of Selenarctos thibelanus is estimated as 395 in the Minshan mountains.The distribution center of Selenarctos thibelanus is Qingchuan,Beichuan and southeast of Pingwu.The density gradually decreases from the center towards all directions.
文摘资源的时空分布不均是野生动物形成季节性生境利用策略的主要动力。这种策略的形成为它们在环境波动时创造了生存机会。岩羊(Pseudois nayaur)主要分布在青藏高原,以草甸、流石滩生境为主要栖息地类型,而位于分布边缘的岩羊存在对森林-草甸交错区的利用情况。为了解岩羊边缘种群的空间利用特征和季节变化,并探究环境结构与物种分布的关系,本研究于2018年6月至2019年8月在四川王朗国家级自然保护区开展红外相机调查,根据监测结果利用列联表卡方检验、Bonferroni法和Post hoc testing检验综合分析岩羊在森林-草甸交错生境中活动的季节性特征。结果表明:1)岩羊在不同生境中的季节性活动强度存在极显著差异(χ^2=503.50,df=6,P<0.05)。2)从不同生境的活动强度季节性变化看,岩羊在草甸的活动,以春季最强(活动频率44.4%,标化残差10.6),夏季最弱(5.3%,-17.4);在林缘的活动,以夏季最强(54.0%,6.6),秋季最弱(30.2%,-9.1);在林内的活动,以夏秋强(夏:40.7%,8.4;秋:45.0%,8.0),春季最弱(3.8%,-11.7)。3)从不同季节生境的活动强度判断,岩羊在夏、秋两季的活动多出现在林内(夏:45.9%,8.4;秋:26.8%,8.0),而冬、春两季的活动更多在草甸(春:20.6%,10.6;冬:49.4%,9.1),岩羊在夏季也较多出现在林缘(41.5%,6.6)。本研究结果显示,岷山北部的岩羊在夏、秋季对针叶林存在较多的季节性利用,可能与躲避高温有关。在全球气候变暖的背景下,高海拔地区气温与降水的显著变化将导致高山林线出现明显的交错和进退,进而影响着众多依赖森林和草甸生境生存的物种的分布。
基金the National Science Foundation for Fostering Talents in Basic Research of the National Natural Science Foundation of China(J1103518)
文摘To determine the effects of eco-factors on the regeneration of arrow bamboo in giant panda habitat,a field study was conducted in the Baozuo and Gonggangling Nature Reserves,Sichuan Province,China.A total of 183 quadrats(10 m×10 m) and 717 small quadrats(1 m×1 m) were investigated within the study site.Bamboo seedling density was used as an indicator of natural regeneration.Twelve factors were measured,which included topography and forest factors(elevation,slope aspect,slope degree,slope position,canopy cover,and shrub cover) and microhabitat factors(upper vegetation cover,herb cover,litter layer cover,moss cover,moss thickness,and dead bamboo density).A One-Way ANOVA was used to analyze the effects of topography and forest factors on seedling density,and a GLM(Generalized Linear Model) procedure was performed to examine the relationship between seedling density and microhabitat factors.The results indicated that elevation and canopy cover had highly significant effects on seedling density:bamboo seedling density was highest and showed the best regeneration at middle elevations(2800-3000 m) and under medium to medium-high canopy cover.Moss thickness,moss cover,and dead bamboo density were the most important microhabitat factors influencing the natural regeneration of bamboo:seedling density increased with increasing moss cover and moss thickness and decreased with increasing dead bamboo density.We propose that removal of dead bamboo and controlling grazing activities may accelerate the process of bamboo regeneration.
