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马尾松毛虫的生态制约机制分析
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作者 李柱军 《林业建设》 2008年第4期63-64,共2页
生态系统对马尾松毛虫有较强的制衡作用,大面积的马尾松纯林是马尾松毛虫暴发的核心根源,松树抗性反应的滞后与天敌和致病菌作用的滞后,形成了暴发的周期性。调整森林生态结构、丰富生物多样性能有效地对马尾松毛虫进行持续管理。
关键词 马尾松毛虫 生态制衡 虫害暴发
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A study of regional CDM projects distribution in China
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作者 Liu Xutong Liu Qingqiang Gu A'lun 《Ecological Economy》 2009年第3期217-227,共11页
CDM will reduce the global GHG emissions with lower costs while promoting sustainable development of the developing countries.However,the lack of distribution equilibrium has been a problem not solved for a long time.... CDM will reduce the global GHG emissions with lower costs while promoting sustainable development of the developing countries.However,the lack of distribution equilibrium has been a problem not solved for a long time.In order to increase CDM distribution equilibrium in China,CDM support requirement extent of different areas is analyzed based on the study on the economic development and sustainable development capability.At the same time,registered and issued projects are analyzed to have an assessment on the CDM distribution equilibrium in China.Based on the study,it is concluded that there is a lack of CDM distribution equilibrium in China as most of CDM support has gone to the relatively more developed areas.Based on the reason analysis from the sector development,CDM market and information circulation aspects,suggestions are given to support CDM development in western areas by the"sector development guidance+CDM capability construction+market support"mode in this paper. 展开更多
关键词 Clean development mechanism EQUILIBRIUM DEVELOPMENT
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THE EXIT PROBABILITIES OF BROWNIAN MOTION WITH VARIABLE DIMENSION APPLYING TO THE CONTROL OF POPULATION GROWTH
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作者 LIXIN SONG WENBIN CHE DAWEI LU 《International Journal of Biomathematics》 2013年第5期1-12,共12页
Using the theory of small ball estimate to study the biological population for keeping ecological balance in an ecosystem, we consider a Brownian motion with variable dimen- sion starting at an interior point of a gen... Using the theory of small ball estimate to study the biological population for keeping ecological balance in an ecosystem, we consider a Brownian motion with variable dimen- sion starting at an interior point of a general parabolic domain Dt in Rd(t)+1 where d(t) ≥ 1 is an increasing integral function as t →∞, d(t) →∞. Let TOt denote the first time the Brownian motion exits from Dr. Upper and lower bounds with exact constants of log P(rDt 〉 t) are given as t →∞, depending on the shape of the domain Dr. The problem is motivated by the early results of Lifshits and Shi, Li, Lu in the exit proba- bilities. The methods of proof are based on the calculus of variations and early works of Lifshits and Shi, Li, Shao in the exit probabilities of Brownian motion. 展开更多
关键词 Small ball estimate biological population Brownian motion.
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