期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
越冬期黑颈鹤个体行为生态的研究 被引量:29
1
作者 李凤山 马建章 《生态学报》 CAS CSCD 北大核心 2000年第2期293-298,共6页
越冬期黑颈鹤的个体行为可分为 :取食、保养、争斗、警戒、动运行为、种间关系及领域性。随着冬季食物资源的逐渐减少 ,在取食行为中幼鹤由乞食、被成鹤供食转为向成鹤抢食。有些家族鹤为保证食物资源而建立领域 ,领域大小与家族内成员... 越冬期黑颈鹤的个体行为可分为 :取食、保养、争斗、警戒、动运行为、种间关系及领域性。随着冬季食物资源的逐渐减少 ,在取食行为中幼鹤由乞食、被成鹤供食转为向成鹤抢食。有些家族鹤为保证食物资源而建立领域 ,领域大小与家族内成员数无关 ,且在冬季 (甚至 1天内 )是变化的。为获得食物和保卫领域 ,黑颈鹤之间 (或与灰鹤之间 )常发生争斗 。 展开更多
关键词 黑颈鹤 个体行为 越冬期
下载PDF
The calculation and analysis of ecological footprints,diversity and developm ent capacity of China 被引量:15
2
作者 XUZhongmin CHENGGuodong +2 位作者 ZHANGZhiqiang PaulHTemplet YongyuanYIN 《Journal of Geographical Sciences》 SCIE CSCD 2003年第1期19-26,共8页
T he ecological footprint of China's provinces is calculated in this pap er. In general, China's development is not sustainable because its ecological footprint is beyond its bio-capacity. The sustainability s... T he ecological footprint of China's provinces is calculated in this pap er. In general, China's development is not sustainable because its ecological footprint is beyond its bio-capacity. The sustainability status of each pr ovince in China is presented. Ulanowicz's development capacity formula w as introduced to discuss the relationship of development and ecological footprin t's diversity. The diversity of ecological impacts is related to the e fficiency with which an economy uses the source and sink services of the environment and, in this view, should be a factor in economic output. Developme nt capacity, calculated from the ecological footprint and its diversity , is used to examine the relationship of economic output with the st ructure of the ecological footprint. China and its provinces are prese nted as a case study to investigate this relationship. The analysis s hows that footprint capacity is significant in predicting economic outp ut. Increasing the ecological footprint's diversity is presented as another way to increase development capacity. 展开更多
关键词 ecological footprints DIVERSITY development capacity China
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部