CH4 is one of the most important greenhouse gases, and mainly comes from soils in forest ecosystems. The objective of this study was to determine the effects of forest management practices such as understory removal a...CH4 is one of the most important greenhouse gases, and mainly comes from soils in forest ecosystems. The objective of this study was to determine the effects of forest management practices such as understory removal and N-fixing species （Cassia alata） addition, on soil CH4 fluxes in four forest plantations in southern China. Fluxes of CH4 were measured in Eucalyptus urophylla plantation （B1）, Acacia crassi-carpa plantation （B2）, 10-native-species-mixed plantation （B3）, and 30-native-species-mixed plantation （B4） stands using the static chamber method in Southern China. Four forest management treatments, includ-ing （1） understory removal and replacement with C. alata （UR＋CA）; （2） understory removal only （UR）; （3） C. alata addition only （CA）; and （4） control without any disturbances （CK）, were applied in the four forest plantations. The results showed that plantation types had a significant effect on soil CH4 fluxes. B1 and B2 tended to be CH4 consumers, while B3 and B4 inclined to be CH4 producers. UR decreased CH4 fluxes by providing a more optimal soil temperature and moisture regime for mi-croorganism community and increasing substrate mineralization. How-ever, CA enhanced CH4 fluxes in B1 and B2 for N-fixing function of C. alata while lowered CH4 fluxes in B3 and B4. Soil CH4 flux rate was significantly related to soil temperature and moisture conditions in the top 10-cm soil layer. Furthermore, the quality of substrates, such as Soil Organic Carbon （SOC） and mineral N might also be important driving factors for CH4 fluxes. This study improved our understanding on CH4 fluxes in plantations under different management practices such as UR and CA.展开更多
The Annual Symposium of the Multinational Association of Supportive Care in Cancer （MASCC）/International Society of Oral Oncology （ISOO） was held in Vancouver, Canada,June 24-26, 2010. The symposium brought togeth...The Annual Symposium of the Multinational Association of Supportive Care in Cancer （MASCC）/International Society of Oral Oncology （ISOO） was held in Vancouver, Canada,June 24-26, 2010. The symposium brought together health care professionals from many countries and many fields of expertise for an excellent forum of ideas, lectures and collegial interactions,and discussed methods to minimize cancer-induced side effects, the symptoms and complications of its treatment, and psychosocial issues facing cancer patients and their families. Some ideas and studies selected from the presentations of different fields of supportive care in cancer presented in this symposium are introduced in this paper.展开更多
THIS year marks the 10th anniversary of the establishment of diplomatic relations between the People’s Republic of China and the Commonwealth of Dominica.China’s1.3 billion-strong population dwarfs Dominica’s less ...THIS year marks the 10th anniversary of the establishment of diplomatic relations between the People’s Republic of China and the Commonwealth of Dominica.China’s1.3 billion-strong population dwarfs Dominica’s less than 100,000 inhabitants.However,the two countries share a common understanding of equality and mutual benefit and have developed bilateral relations noticeably over the past 10 years,witnessed by achievements ranging from high-level visits and meetings between leaders to fruitful cooperation in political,展开更多
Singapore＇s Chinese literature education has continuously evolved and advanced over the years, forming a unique style in global Chinese education, which can be described as： ＂Singapore pie＂. Through its bilingual ...Singapore＇s Chinese literature education has continuously evolved and advanced over the years, forming a unique style in global Chinese education, which can be described as： ＂Singapore pie＂. Through its bilingual policy, the Singapore government has been committed to creating a pool of bicultural talents, by supplementing the teaching of Chinese language with classes on Chinese literature and culture. This thesis seeks to understand the pros and cons of Chinese literature education in Singapore by analysing its development over the years. The teaching of Chinese literature began with the first wave of Chinese migration to Nanyang in the 19th century, and from there, it went through three phases of development： relocation, adjustment, and burgeoning.展开更多
基金This research was supported by the Natural Science Foundation of China (30630015, 30771704)
文摘CH4 is one of the most important greenhouse gases, and mainly comes from soils in forest ecosystems. The objective of this study was to determine the effects of forest management practices such as understory removal and N-fixing species （Cassia alata） addition, on soil CH4 fluxes in four forest plantations in southern China. Fluxes of CH4 were measured in Eucalyptus urophylla plantation （B1）, Acacia crassi-carpa plantation （B2）, 10-native-species-mixed plantation （B3）, and 30-native-species-mixed plantation （B4） stands using the static chamber method in Southern China. Four forest management treatments, includ-ing （1） understory removal and replacement with C. alata （UR＋CA）; （2） understory removal only （UR）; （3） C. alata addition only （CA）; and （4） control without any disturbances （CK）, were applied in the four forest plantations. The results showed that plantation types had a significant effect on soil CH4 fluxes. B1 and B2 tended to be CH4 consumers, while B3 and B4 inclined to be CH4 producers. UR decreased CH4 fluxes by providing a more optimal soil temperature and moisture regime for mi-croorganism community and increasing substrate mineralization. How-ever, CA enhanced CH4 fluxes in B1 and B2 for N-fixing function of C. alata while lowered CH4 fluxes in B3 and B4. Soil CH4 flux rate was significantly related to soil temperature and moisture conditions in the top 10-cm soil layer. Furthermore, the quality of substrates, such as Soil Organic Carbon （SOC） and mineral N might also be important driving factors for CH4 fluxes. This study improved our understanding on CH4 fluxes in plantations under different management practices such as UR and CA.
文摘The Annual Symposium of the Multinational Association of Supportive Care in Cancer （MASCC）/International Society of Oral Oncology （ISOO） was held in Vancouver, Canada,June 24-26, 2010. The symposium brought together health care professionals from many countries and many fields of expertise for an excellent forum of ideas, lectures and collegial interactions,and discussed methods to minimize cancer-induced side effects, the symptoms and complications of its treatment, and psychosocial issues facing cancer patients and their families. Some ideas and studies selected from the presentations of different fields of supportive care in cancer presented in this symposium are introduced in this paper.
文摘THIS year marks the 10th anniversary of the establishment of diplomatic relations between the People’s Republic of China and the Commonwealth of Dominica.China’s1.3 billion-strong population dwarfs Dominica’s less than 100,000 inhabitants.However,the two countries share a common understanding of equality and mutual benefit and have developed bilateral relations noticeably over the past 10 years,witnessed by achievements ranging from high-level visits and meetings between leaders to fruitful cooperation in political,
文摘Singapore＇s Chinese literature education has continuously evolved and advanced over the years, forming a unique style in global Chinese education, which can be described as： ＂Singapore pie＂. Through its bilingual policy, the Singapore government has been committed to creating a pool of bicultural talents, by supplementing the teaching of Chinese language with classes on Chinese literature and culture. This thesis seeks to understand the pros and cons of Chinese literature education in Singapore by analysing its development over the years. The teaching of Chinese literature began with the first wave of Chinese migration to Nanyang in the 19th century, and from there, it went through three phases of development： relocation, adjustment, and burgeoning.
