Currently, transforming the mode of forest management and developing multiple forest management practices are actively encouraged in China. As one forest management type, ginseng cultivation under larch plantations ha...Currently, transforming the mode of forest management and developing multiple forest management practices are actively encouraged in China. As one forest management type, ginseng cultivation under larch plantations has been developed significantly in the east of Liaoning Province. However, research on the influence of the ecological environment for this mode of production is still deficient. Based on this, our study compares the plant diversity and soil properties in the ginseng cultivation under larch plantations(LG) with larch plantations(LP) and natural secondary forests(SF). First, we randomly selected three plots for each of the three stand types which have similar stand characteristics; then, we carried out a plant diversity survey and soil sampling in each of the nine plots. The results show that no significant difference was found in plant diversity between LG and LP, but theevenness of herbs was significantly lower in LG than LP. No obvious changes in soil physical properties were found in LG, but a significant decrease in most of the soil nutrient content was presented in LG. Furthermore, we found a correlation between plant diversity(H') and soil properties in the three kinds of stand types, especially between herbaceous plant diversity and soil properties. We conclude that ginseng cultivation under larch plantations has no obvious effect on plant diversity, except the herbaceous evenness. Soil fertility can be depleted significantly in LG, but physical structures are not affected. Moreover, maintaining the diversity of herbaceous plants and controlling the density of ginseng cultivation in LG by farmers are important for the ecological environment. Based on this study and its good comprehensive benefits and with the support of policy, we think this forest management type should be promoted moderately in the region.展开更多
SSH was used to analyze gene transactivation during root formation of Larix cuttings. Two subtractive cDNA libraries were constructed from clone 31-6 as tester or driver and clone 15-4 as driver or tester. The SSH PCR...SSH was used to analyze gene transactivation during root formation of Larix cuttings. Two subtractive cDNA libraries were constructed from clone 31-6 as tester or driver and clone 15-4 as driver or tester. The SSH PCR products from the libraries were cloned into a pGEM-T easy vector and after PCR and dot blot analysis, positive clones were selected, sequenced and compared to the database in GenBank with BLASTX. The results of a sequence assembly in two libraries show that 521 UniEST （expressed sequence tag） were obtained. These 521 UniEST belong to metabolism, signal pathways, transport, resistance, developmental processes, local- ization, unknown proteins and ＂no hits found＂. All of these suggest that subtractive cDNA libraries during root formation of Larix cuttings were constructed successfully.展开更多
National forest inventory materials and data from China Forest Ecosystem Location Research Network （CFERN） were obtained for estimating four periods of carbon storage of Bamboo forest ecosystem from 1977 to 2003 in ...National forest inventory materials and data from China Forest Ecosystem Location Research Network （CFERN） were obtained for estimating four periods of carbon storage of Bamboo forest ecosystem from 1977 to 2003 in China. The spatial and temporal patterns, vertical distribution and potential carbon storage of the bamboo forest ecosystem were analyzed. The results showed that carbon storage of Chinese bamboo forest ecosystem was 537.6 Mt C during 1977 and 1981, 598.61 Mt C during 1984 and 1988, 710.14 Mt C during 1994 and 1998, and 837.92 Mt C during 1999 and 2003. It showed that the carbon storage was increasing during that time. Zhejiang, Jiangxi, Fujian, Hunan, Guangdong and Sichuan were the major carbon pools in China, with the percentages of carbon storage between 80.04 and 83.13 percent in all. The percentages of carbon storage of vegetation, litter, and soil were between 23.85 and 24.48 percent, between 0.92 and 0.96 percent, and between 74.56 and 75.23 percent respectively. Therefore, it is concluded that the carbon storage in different layers were similar vertically. Carbon storage was 837.92 Mt C from 1999 to 2003, and it will be increased to 947.54 Mt C after one age period with a rate of 54.81Mt carbons stored in ecosystem every year.展开更多
基金financially supported by the research on soft science of forestry(2014-R05)consulting project of the Chinese Academy of Engineering(2013-XZ-22)
文摘Currently, transforming the mode of forest management and developing multiple forest management practices are actively encouraged in China. As one forest management type, ginseng cultivation under larch plantations has been developed significantly in the east of Liaoning Province. However, research on the influence of the ecological environment for this mode of production is still deficient. Based on this, our study compares the plant diversity and soil properties in the ginseng cultivation under larch plantations(LG) with larch plantations(LP) and natural secondary forests(SF). First, we randomly selected three plots for each of the three stand types which have similar stand characteristics; then, we carried out a plant diversity survey and soil sampling in each of the nine plots. The results show that no significant difference was found in plant diversity between LG and LP, but theevenness of herbs was significantly lower in LG than LP. No obvious changes in soil physical properties were found in LG, but a significant decrease in most of the soil nutrient content was presented in LG. Furthermore, we found a correlation between plant diversity(H') and soil properties in the three kinds of stand types, especially between herbaceous plant diversity and soil properties. We conclude that ginseng cultivation under larch plantations has no obvious effect on plant diversity, except the herbaceous evenness. Soil fertility can be depleted significantly in LG, but physical structures are not affected. Moreover, maintaining the diversity of herbaceous plants and controlling the density of ginseng cultivation in LG by farmers are important for the ecological environment. Based on this study and its good comprehensive benefits and with the support of policy, we think this forest management type should be promoted moderately in the region.
基金supported by the National S&T Support Projects for the 11th Five-Year Plan (2006BA-D01A14)the National High-Tech "863" Program of China (2006AA100109)the National "973" Program (2009CB119107)
文摘SSH was used to analyze gene transactivation during root formation of Larix cuttings. Two subtractive cDNA libraries were constructed from clone 31-6 as tester or driver and clone 15-4 as driver or tester. The SSH PCR products from the libraries were cloned into a pGEM-T easy vector and after PCR and dot blot analysis, positive clones were selected, sequenced and compared to the database in GenBank with BLASTX. The results of a sequence assembly in two libraries show that 521 UniEST （expressed sequence tag） were obtained. These 521 UniEST belong to metabolism, signal pathways, transport, resistance, developmental processes, local- ization, unknown proteins and ＂no hits found＂. All of these suggest that subtractive cDNA libraries during root formation of Larix cuttings were constructed successfully.
文摘National forest inventory materials and data from China Forest Ecosystem Location Research Network （CFERN） were obtained for estimating four periods of carbon storage of Bamboo forest ecosystem from 1977 to 2003 in China. The spatial and temporal patterns, vertical distribution and potential carbon storage of the bamboo forest ecosystem were analyzed. The results showed that carbon storage of Chinese bamboo forest ecosystem was 537.6 Mt C during 1977 and 1981, 598.61 Mt C during 1984 and 1988, 710.14 Mt C during 1994 and 1998, and 837.92 Mt C during 1999 and 2003. It showed that the carbon storage was increasing during that time. Zhejiang, Jiangxi, Fujian, Hunan, Guangdong and Sichuan were the major carbon pools in China, with the percentages of carbon storage between 80.04 and 83.13 percent in all. The percentages of carbon storage of vegetation, litter, and soil were between 23.85 and 24.48 percent, between 0.92 and 0.96 percent, and between 74.56 and 75.23 percent respectively. Therefore, it is concluded that the carbon storage in different layers were similar vertically. Carbon storage was 837.92 Mt C from 1999 to 2003, and it will be increased to 947.54 Mt C after one age period with a rate of 54.81Mt carbons stored in ecosystem every year.
