功能负载(FL)原则预测高FL音位对比,例如/i:/和/?/,比低FL音位对比,例如/u:/和/?/,对发音的相互可懂度的影响更大。为了评估FL原则是否能准确预测英语作为通用语言(ELF)条件下的清晰度,本研究部分复制了由Munro和Derwing(2006)所做的第...功能负载(FL)原则预测高FL音位对比,例如/i:/和/?/,比低FL音位对比,例如/u:/和/?/,对发音的相互可懂度的影响更大。为了评估FL原则是否能准确预测英语作为通用语言(ELF)条件下的清晰度,本研究部分复制了由Munro和Derwing(2006)所做的第一项实证支持FL原则的研究。中国人录制了24个包含目标词的高低FL音素替换的英语句子,171名日本大学生听了这些句子并将目标词转写成书面英语。本研究的假设是,具有高FL音素替换的目标词比具有低FL音素替换的目标词更难理解。结果表明,具有高FL音素替换的目标词的清晰度确实低于具有低FL音素替换的目标词,而且多个高FL音素替换的叠加更加降低清晰度。本研究结果与Munro and Derwing (2006)的发现一致,即高FL音素替换比低FL音素替换更能降低清晰度,因此这项研究宣称在ELF条件下成功复制了该研究的一个方面。展开更多
Mongolian pine (Pinus sylvestiris Linnaeus var. mongolica Litvinov) as a valuable conifer tree species has been broadly introduced to the sandy land areas in 揟hree North?regions (North, northwest and northeast of Chi...Mongolian pine (Pinus sylvestiris Linnaeus var. mongolica Litvinov) as a valuable conifer tree species has been broadly introduced to the sandy land areas in 揟hree North?regions (North, northwest and northeast of China), but many problems occurred in the earliest Mongolian pine plantations in Zhanggutai, Zhangwu County, Liaoning Province (ZZL). In order to clarify the reason, comprehensive investigations were carried out on differences in structure characteristics, growth processes and ecological factors between artificial stands (the first plantation established in ZZL in 1950s) and natural stands (the origin forests of the tree species in Honghuaerji, Inner Mongolia) on sandy land. The results showed that variation of diameter-class distributions in artificial stands and natural stands could be described by Weibull and Normal distribution models, respectively. Chapman-Richards growth model was employed to reconstruct the growth process of Mongolian pine based on the data from field investigation and stem analysis. The ages of maximum of relative growth rate and average growth rate of DBH, height, and volume of planted trees were 11, 22 years, 8, 15 years and 35, 59 years earlier than those of natural stand trees, respectively. In respect of the incremental acceleration of volume, the artificial and natural stands reached their maximum values at 14 years and 33 years respectively. The quantitative maturity ages of artificial stands and natural stands were 43 years and 102 years respectively. It was concluded that the life span of the Mongolian pine trees in natural stands was about 60 years longer than those in artificial stands. The differences mentioned above between artificial and natural Mongolian pine forests on sandy land were partially attributed to the drastic variations of ecological conditions such as latitude, temperature, precipitation, evaporation and height above sea level. Human beings' disturbances and higher density in plantation forest may be ascribed as additional reasons. Those results may be potentially useful for the management and afforestation of Mongolian pine plantations on sandy land in arid and semi-arid areas.展开更多
Based on the literature collection and field investigation,the development history,type,area and management of Japanese protective forests were introduced.The objective of this paper is to provide some references for ...Based on the literature collection and field investigation,the development history,type,area and management of Japanese protective forests were introduced.The objective of this paper is to provide some references for the establishment and management of protective plantations in China.展开更多
文摘功能负载(FL)原则预测高FL音位对比,例如/i:/和/?/,比低FL音位对比,例如/u:/和/?/,对发音的相互可懂度的影响更大。为了评估FL原则是否能准确预测英语作为通用语言(ELF)条件下的清晰度,本研究部分复制了由Munro和Derwing(2006)所做的第一项实证支持FL原则的研究。中国人录制了24个包含目标词的高低FL音素替换的英语句子,171名日本大学生听了这些句子并将目标词转写成书面英语。本研究的假设是,具有高FL音素替换的目标词比具有低FL音素替换的目标词更难理解。结果表明,具有高FL音素替换的目标词的清晰度确实低于具有低FL音素替换的目标词,而且多个高FL音素替换的叠加更加降低清晰度。本研究结果与Munro and Derwing (2006)的发现一致,即高FL音素替换比低FL音素替换更能降低清晰度,因此这项研究宣称在ELF条件下成功复制了该研究的一个方面。
基金The research was supported by innovation research project of Chinese Academy of Sciences (KZCX3-SW-418) and by Nature Science Foundation of Liaoning Province (20021006).
文摘Mongolian pine (Pinus sylvestiris Linnaeus var. mongolica Litvinov) as a valuable conifer tree species has been broadly introduced to the sandy land areas in 揟hree North?regions (North, northwest and northeast of China), but many problems occurred in the earliest Mongolian pine plantations in Zhanggutai, Zhangwu County, Liaoning Province (ZZL). In order to clarify the reason, comprehensive investigations were carried out on differences in structure characteristics, growth processes and ecological factors between artificial stands (the first plantation established in ZZL in 1950s) and natural stands (the origin forests of the tree species in Honghuaerji, Inner Mongolia) on sandy land. The results showed that variation of diameter-class distributions in artificial stands and natural stands could be described by Weibull and Normal distribution models, respectively. Chapman-Richards growth model was employed to reconstruct the growth process of Mongolian pine based on the data from field investigation and stem analysis. The ages of maximum of relative growth rate and average growth rate of DBH, height, and volume of planted trees were 11, 22 years, 8, 15 years and 35, 59 years earlier than those of natural stand trees, respectively. In respect of the incremental acceleration of volume, the artificial and natural stands reached their maximum values at 14 years and 33 years respectively. The quantitative maturity ages of artificial stands and natural stands were 43 years and 102 years respectively. It was concluded that the life span of the Mongolian pine trees in natural stands was about 60 years longer than those in artificial stands. The differences mentioned above between artificial and natural Mongolian pine forests on sandy land were partially attributed to the drastic variations of ecological conditions such as latitude, temperature, precipitation, evaporation and height above sea level. Human beings' disturbances and higher density in plantation forest may be ascribed as additional reasons. Those results may be potentially useful for the management and afforestation of Mongolian pine plantations on sandy land in arid and semi-arid areas.
文摘Based on the literature collection and field investigation,the development history,type,area and management of Japanese protective forests were introduced.The objective of this paper is to provide some references for the establishment and management of protective plantations in China.
