Using the data obtained from sample plots of Phyllostachys pubescens, the dynamic model of energy flow of Phyllostachys pubescens ecosystem was built in this paper.Based on the model,the analysis of energy flow was co...Using the data obtained from sample plots of Phyllostachys pubescens, the dynamic model of energy flow of Phyllostachys pubescens ecosystem was built in this paper.Based on the model,the analysis of energy flow was combined organically with the methods of economical threshold, the concept of economical threshold of energy flow of Phyllostachys pubescen ecosystem (EET) was put forward,and the effect of compensation and super compensation were discussed furthermore.The results showed that the economical threshold of energy flow of Phyllostachys pubescens ecosystem were: EET leaf =0.3133· x 3,EET branch =0.2440· x 1 (where x 1 and x 3 represent energy of leave and branches respectively) ;the effect of compensation and super compensation existed in Phyllostachys pubescens, and the compensation point and super compensation point of Phyllostachys pubescens were 31.33%,13.61% (expressed in defoliation rate)and 24.40%,11.94% (expressed in branch cut rate)respectively.Therefor,this paper will not only enrich the study of energy ecology in the Phyllostachys pubescens ecosystem,but also provide a scientific basis for the management of Phyllostachys pubescens.展开更多
文摘害虫经济阈值(Economic threshold,ET)作为农业害虫管理关键决策依据,是主要基于挽回作物损失的价值和防治费用的农业害虫防治经济阈值。在实践应用中,由于对害虫防治措施的生态代价考虑不足,往往导致阈值指标偏低,防治次数和农药使用量偏多。本文利用农药生态效应评估的最新研究进展,提出了充分考虑防治费用和防治生态代价的农业害虫防治生态经济阈值(Ecological and economic threshold,EET)概念,给出了基于农药生态风险指数的简便易行的数学模型和估算方法。生态经济阈值的提出与推广应用,不仅为现代农业害虫防治决策提供了科学依据,而且有助于我国的农药减量目标的实现。
文摘Using the data obtained from sample plots of Phyllostachys pubescens, the dynamic model of energy flow of Phyllostachys pubescens ecosystem was built in this paper.Based on the model,the analysis of energy flow was combined organically with the methods of economical threshold, the concept of economical threshold of energy flow of Phyllostachys pubescen ecosystem (EET) was put forward,and the effect of compensation and super compensation were discussed furthermore.The results showed that the economical threshold of energy flow of Phyllostachys pubescens ecosystem were: EET leaf =0.3133· x 3,EET branch =0.2440· x 1 (where x 1 and x 3 represent energy of leave and branches respectively) ;the effect of compensation and super compensation existed in Phyllostachys pubescens, and the compensation point and super compensation point of Phyllostachys pubescens were 31.33%,13.61% (expressed in defoliation rate)and 24.40%,11.94% (expressed in branch cut rate)respectively.Therefor,this paper will not only enrich the study of energy ecology in the Phyllostachys pubescens ecosystem,but also provide a scientific basis for the management of Phyllostachys pubescens.
