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樟树种子性状产地表型变异研究 被引量:57
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作者 任华东 姚小华 《江西农业大学学报》 CAS CSCD 2000年第3期370-375,共6页
对我国樟树自然分布区 47个产地采集的樟树种子进行取样观测 ,分别测定种子的长、宽、高、重 ,并进行播种试验 ,观测种子的场圃出苗率。分析樟树种子形态场圃出苗率的产地差异、地理变异规律及种子形态对种子出苗率和苗木生长的影响。... 对我国樟树自然分布区 47个产地采集的樟树种子进行取样观测 ,分别测定种子的长、宽、高、重 ,并进行播种试验 ,观测种子的场圃出苗率。分析樟树种子形态场圃出苗率的产地差异、地理变异规律及种子形态对种子出苗率和苗木生长的影响。分析表明 ,樟树种子形态存在显著的产地差异 ,种子的大小存在明显的经向变异 ,种形指数 (长宽比 )与纬度呈显著的负相差。种形指数与苗期生长有密切的关系。根据樟树种子的大小、形状、百粒重等 7个性状的产地平均数 ,采用欧氏距离类平均法进行聚类分析 ,初步将樟树种子性状自然分布划分为 展开更多
关键词 樟树 种子形态 产地变异 苗期生长 聚类分析
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Geographic variation and provenance selection for bamboo wood properties in Bambusa chungii 被引量:3
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作者 杨秀艳 傅懋毅 +1 位作者 谢锦忠 李正才 《Journal of Forestry Research》 SCIE CAS CSCD 2009年第A3期261-267,287,共9页
Using 3-year-old culms of 8 provenances of Bambusa chungii from Guangdong, Guangxi and Hainan Provinces, the indexes of wood properties, such as fiber dimensions and chemical composition were investigated and analyzed... Using 3-year-old culms of 8 provenances of Bambusa chungii from Guangdong, Guangxi and Hainan Provinces, the indexes of wood properties, such as fiber dimensions and chemical composition were investigated and analyzed by the methods of Analysis of variance and correlation coefficient to reveal the geographic genetic variation situation. The results showed that there are significant differences between fiber length, fibrin and 1% NaOH extraction contents of B. chungii from 8 provenances; moreover, the fiber length and fiber length/width ratio had a decreasing change pattern with geographic variation from the south to the north in altitude (from high to low in elevation). The heritabilities for fibrin, fiber length, 1% NaOH extractive, lignin and fiber length/width ratio were 0.7, 0.84, 0.54, 0.38 and 0.13, respectively. A significant negative correlation was found between 1% NaOH extraction, benzo-alcohol extraction contents and bamboo culm yield, whereas there was a significant positive correlation between fibrin contents and bamboo wood yield. Besides, a close correlation was detected between fiber dimensions indices and bamboo growth or bamboo wood yield. Finally, three provenances with high qualities and culm yield, i.e. Huaiji, Xinyi and Guilin, were selected as superior sources based on principal component analysis. 展开更多
关键词 Bambusa chungii bamboo wood property pulp-bamboo geographic variation provenance selection
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Topographic Indices and Yield Variability in a Rolling Landscape of Western Canada 被引量:2
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作者 CHI Bao-Liang BING Cheng-Si +1 位作者 F. WALLEY T. YATES 《Pedosphere》 SCIE CAS CSCD 2009年第3期362-370,共9页
Understanding the relationships between topographic indices and crop yield variability is important for soil manage- ment and crop production in rolling landscape. Two agricultural fields at Alvena and Hepburn, Saskat... Understanding the relationships between topographic indices and crop yield variability is important for soil manage- ment and crop production in rolling landscape. Two agricultural fields at Alvena and Hepburn, Saskatchewan, Canada were selected to examine how topographic indices were related to wheat yield under two topographic and weather conditions in the Canadian prairies. The landscapes of the two sites are classified as hummocky and the dominant soil type is an Aridic Ustoll. The relationships among yield, topography, soil, and weather were analyzed using wheat (Triticum aestivum L.) grain yield from Alvena in 2001 (dry year) and 2004 (wet year) and from Hepburn in 1998 (dry year). Topographic/soil indices included relative elevation, wetness index, upslope length, curvature, soil organic matter, and soil moisture storage before seeding. The results indicated that, in the dry years, the correlation coefficients between upslope length and grain yield were 0.79 for the typical rolling landscape (Alvena) in 2001 and 0.73 for shallow gentle rolling landscape (Hepburn) in 1998. In the wet year (2004), the relationships between yield and topographic/soil attributes were not as strong as in dry years. Therefore, upslope length was the best yield indicator for the two landscapes in dry years, whereas no topographic indices were highly correlated to crop yield in wet years. Those topographic indices seemed useful in identifying the yield variability and delineating the proper management zone. 展开更多
关键词 rolling landscape topographic indices upslope length yield variability
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