[Objective] This study was to analyze the high yielding, stability, adaptabil-ity and main characteristics of check cultivars in national cotton regional trials in the Yangtze River Val ey in 2000-2013, with the aim t...[Objective] This study was to analyze the high yielding, stability, adaptabil-ity and main characteristics of check cultivars in national cotton regional trials in the Yangtze River Val ey in 2000-2013, with the aim to provide theoretical basis for the reasonable selection of check cultivars for cotton regional trials. [Method] GGE biplot analysis method was used to carry out the intensive analysis and comprehensive comparisons on the performances and differences of the 9 major characters of check cultivars, namely, lint cotton yield , stability, and other main traits including bol weight, bol number, lint percentage, fiber length, fiber strength, micronaire val-ue, plant height and seed index. [Result] Ezamian 10 was suitable in the majority of cotton planting regions in the Yangtze River Val ey, with the best high yielding abili-ty and perfect yield stability. The yielding ability of Xiangzamian 8 ranked the sec-ond, but its stability was the poorest. Xiangzamian 8 was of the specific adaptive cultivar with relatively good performance in high yielding but the poorest stability. The suitable planting areas of Xiangzamian 8 were limited to the cotton planting re-gion around Dongting Lake in Hunan province, Poyang Lake in Jiangxi Province, the Coastal region in Jiangsu Province and Wuhan district in Hubei Province. Xi-angzamian 2 performanced poorer in both yielding and stability, while Simian 3 ranked first in stability but the last in yielding ability. The dominant character of Xi-angzamian 8 and Xiangzamian 2 were high cotton plants and big bol s. Simian 3 performanced super in lint percentage and fiber length. Ezamian 10 was strong in cotton bol formation ability, lint cotton yielding, fiber strength and seed size, as wel as high micronaire value. [Conclusion] The outstanding performance of Ezamian 10 in high and stable yield in the Yangtze River Val ey in recent years has effectively promoted the high yielding ability of candidate varieties in cotton regional trials in the area.展开更多
This study aims to understand the particle size distribution and depositional styles of glacierassociated deposits in the Moxi basin in southwest China. Based on field surveys, 28 samples from glacier-associated depos...This study aims to understand the particle size distribution and depositional styles of glacierassociated deposits in the Moxi basin in southwest China. Based on field surveys, 28 samples from glacier-associated deposits(including glacial till,fluvioglacial, debris flow, river and lake deposits)were collected and tested in the laboratory. The results showed that the glacier-associated deposits can be differentiated based on particle gradation,particle size distribution and accumulated percentages. We evaluated the evolution of a former dammed lake in the Moxi basin based on glacierassociated deposits. The results of this study also indicated that the Moxi Platform was not formed by a single depositional process but is composed of both fluvioglacial and debris flow deposits. This research shows that the depositional style analysis is useful in identifying different glacier-associated deposits in high mountain regions. Moreover, the evaluation of the differences in particle sizes of the glacierassociated deposits is useful in reconstructing geohazard events in periglacial regions, and this information can help in identifying and reducing the potential risks associated with geo-hazards.展开更多
水平空间分辨率对于模式模拟影响的验证一直是大气模型重要的研究内容,提高分辨率能够细致描述地形、下垫面状况等区域特征.准确的下垫面信息对于区域大气模拟的精度具有显著的影响。本文对区域大气模型Weather Research and Forecastin...水平空间分辨率对于模式模拟影响的验证一直是大气模型重要的研究内容,提高分辨率能够细致描述地形、下垫面状况等区域特征.准确的下垫面信息对于区域大气模拟的精度具有显著的影响。本文对区域大气模型Weather Research and Forecasting Model(WRF)在黑河流域进行5km和1km的对比试验,检验水平分辨率对WRF模拟精度的影响。通过与黑河综合遥感联合试验中7个站点观测数据的比较,以平均误差、均方根误差和相关系数为指标,分析了WRF模式下垫面替换前后近地表气象要素的模拟精度。结果表明:1)水平分辨率为1km的WRF模式模拟的近地表气象要素刻画得比5km的WRF模式模拟更加精细,更加符合近地表下垫面的变化特征;2)采用1km水平分辨率,黑河综合遥感联合试验(Watershed Allied Telemetry Experimental Research,以下简称:WATER)站点所在的格点的高程信息更加准确;3)采用1km水平分辨率,WRF模式模拟的近地表气压与观测值的误差比5km的WRF模拟值的误差减少很多,尤其是在黑河流域上游区域。展开更多
The aims of forest restorationRestoration on of mountain slopes forests is often used to achieveone or a combination of the following aims, should be diverse, and includeincluding increased production, soilprotection ...The aims of forest restorationRestoration on of mountain slopes forests is often used to achieveone or a combination of the following aims, should be diverse, and includeincluding increased production, soilprotection and wildlife conservation, .and each development scheme should have a combination of thepurposes In this paper, we proposed biodiversity-oriented silviculture was proposed as a design principle inforest restoration design principle to meet the requirements and then described from which strip-cutting ofshrubs was used as the restoring technology of restoring forests by strip-cutting shrubs that developed formthe design principle. More than 10-year-observations, and experimentals and results of from more than 10years research on the afforestation practices in the upper reaches of Minjiang River, Sichuan, China, indicatedthat the technology was feasible and had many advantages. In the technology, sStrip-cutting of shrubsameliorated microclimate conditions, and improved soil nutrient level for the growth of target tree speciesand. increased The the physical survival of pine species was increased. Structural diversity, in terms ofspecies, was did not much increased, but a shrub species was observed to differentiate from shrub layer andtended to form mixed forests. Preserve belts of the technology were supposed to cover meet public demandsincluding biodiversity conservation and soil protection, and lay a foundation foract as a basic stage inecologically progressive succession. Although it is too early to conclude that this approach is successful in allfunctions, The promising initial resultslook promising indicate that strip-cutting of shrubs may be an effectivepractice for forest restoration in the upper reaches of Minjiang River, Sichuan, China.展开更多
基金Supported by National Key Special Project for Breeding and Cultivation of GMO Varieties in China(2012ZX08013016)the Special Project of Regional Crop Trials from the Ministry of Agriculture of China(2911108)
文摘[Objective] This study was to analyze the high yielding, stability, adaptabil-ity and main characteristics of check cultivars in national cotton regional trials in the Yangtze River Val ey in 2000-2013, with the aim to provide theoretical basis for the reasonable selection of check cultivars for cotton regional trials. [Method] GGE biplot analysis method was used to carry out the intensive analysis and comprehensive comparisons on the performances and differences of the 9 major characters of check cultivars, namely, lint cotton yield , stability, and other main traits including bol weight, bol number, lint percentage, fiber length, fiber strength, micronaire val-ue, plant height and seed index. [Result] Ezamian 10 was suitable in the majority of cotton planting regions in the Yangtze River Val ey, with the best high yielding abili-ty and perfect yield stability. The yielding ability of Xiangzamian 8 ranked the sec-ond, but its stability was the poorest. Xiangzamian 8 was of the specific adaptive cultivar with relatively good performance in high yielding but the poorest stability. The suitable planting areas of Xiangzamian 8 were limited to the cotton planting re-gion around Dongting Lake in Hunan province, Poyang Lake in Jiangxi Province, the Coastal region in Jiangsu Province and Wuhan district in Hubei Province. Xi-angzamian 2 performanced poorer in both yielding and stability, while Simian 3 ranked first in stability but the last in yielding ability. The dominant character of Xi-angzamian 8 and Xiangzamian 2 were high cotton plants and big bol s. Simian 3 performanced super in lint percentage and fiber length. Ezamian 10 was strong in cotton bol formation ability, lint cotton yielding, fiber strength and seed size, as wel as high micronaire value. [Conclusion] The outstanding performance of Ezamian 10 in high and stable yield in the Yangtze River Val ey in recent years has effectively promoted the high yielding ability of candidate varieties in cotton regional trials in the area.
基金funded by The China Geological Survey (Grant No. 12120113010200)Ministry of Science and Technology of the People’s Republic of China (Grant No. 2011FY110100-5)The National Natural Science Foundation of China (Grant No. 41101086)
文摘This study aims to understand the particle size distribution and depositional styles of glacierassociated deposits in the Moxi basin in southwest China. Based on field surveys, 28 samples from glacier-associated deposits(including glacial till,fluvioglacial, debris flow, river and lake deposits)were collected and tested in the laboratory. The results showed that the glacier-associated deposits can be differentiated based on particle gradation,particle size distribution and accumulated percentages. We evaluated the evolution of a former dammed lake in the Moxi basin based on glacierassociated deposits. The results of this study also indicated that the Moxi Platform was not formed by a single depositional process but is composed of both fluvioglacial and debris flow deposits. This research shows that the depositional style analysis is useful in identifying different glacier-associated deposits in high mountain regions. Moreover, the evaluation of the differences in particle sizes of the glacierassociated deposits is useful in reconstructing geohazard events in periglacial regions, and this information can help in identifying and reducing the potential risks associated with geo-hazards.
文摘水平空间分辨率对于模式模拟影响的验证一直是大气模型重要的研究内容,提高分辨率能够细致描述地形、下垫面状况等区域特征.准确的下垫面信息对于区域大气模拟的精度具有显著的影响。本文对区域大气模型Weather Research and Forecasting Model(WRF)在黑河流域进行5km和1km的对比试验,检验水平分辨率对WRF模拟精度的影响。通过与黑河综合遥感联合试验中7个站点观测数据的比较,以平均误差、均方根误差和相关系数为指标,分析了WRF模式下垫面替换前后近地表气象要素的模拟精度。结果表明:1)水平分辨率为1km的WRF模式模拟的近地表气象要素刻画得比5km的WRF模式模拟更加精细,更加符合近地表下垫面的变化特征;2)采用1km水平分辨率,黑河综合遥感联合试验(Watershed Allied Telemetry Experimental Research,以下简称:WATER)站点所在的格点的高程信息更加准确;3)采用1km水平分辨率,WRF模式模拟的近地表气压与观测值的误差比5km的WRF模拟值的误差减少很多,尤其是在黑河流域上游区域。
文摘The aims of forest restorationRestoration on of mountain slopes forests is often used to achieveone or a combination of the following aims, should be diverse, and includeincluding increased production, soilprotection and wildlife conservation, .and each development scheme should have a combination of thepurposes In this paper, we proposed biodiversity-oriented silviculture was proposed as a design principle inforest restoration design principle to meet the requirements and then described from which strip-cutting ofshrubs was used as the restoring technology of restoring forests by strip-cutting shrubs that developed formthe design principle. More than 10-year-observations, and experimentals and results of from more than 10years research on the afforestation practices in the upper reaches of Minjiang River, Sichuan, China, indicatedthat the technology was feasible and had many advantages. In the technology, sStrip-cutting of shrubsameliorated microclimate conditions, and improved soil nutrient level for the growth of target tree speciesand. increased The the physical survival of pine species was increased. Structural diversity, in terms ofspecies, was did not much increased, but a shrub species was observed to differentiate from shrub layer andtended to form mixed forests. Preserve belts of the technology were supposed to cover meet public demandsincluding biodiversity conservation and soil protection, and lay a foundation foract as a basic stage inecologically progressive succession. Although it is too early to conclude that this approach is successful in allfunctions, The promising initial resultslook promising indicate that strip-cutting of shrubs may be an effectivepractice for forest restoration in the upper reaches of Minjiang River, Sichuan, China.
