以牡丹江32为试材,研究密度和插秧株数对水稻群体茎蘖数动态、最大叶面积指数、干物重积累及产量的影响,研究发现,为保证水稻较高群体茎蘖数需提高增加每穴插秧株数至4~6株,较小的每穴占地面积有利于群体茎蘖数的提高,最佳行距...以牡丹江32为试材,研究密度和插秧株数对水稻群体茎蘖数动态、最大叶面积指数、干物重积累及产量的影响,研究发现,为保证水稻较高群体茎蘖数需提高增加每穴插秧株数至4~6株,较小的每穴占地面积有利于群体茎蘖数的提高,最佳行距×株距为36 cm ×12 cm ,这与常规栽培方式一致。增加每穴插秧株数可显著增加最大叶面积指数,这种增加作用主要是通过增加每平方米茎蘖数实现的,而增加每穴占地面积对最大叶面积指数有降低作用。成熟期干物重与每穴插秧株数及每穴面积相关性不显著,通径分析表明,增加每穴插秧株数有增加干物重的趋势,而扩大每穴面积会减小干物重。每平方米茎蘖数、成熟期干物重、最大叶面积指数与产量呈显著或极显著正相关。对于牡丹江32水稻品种,插秧规格40 cm ×10 cm 或30 cm ×12 cm ,每穴插秧4~6株,产量可达到8635.4、8634.0 kg·hm -2,二者差异不大,显著或极显著大于其他处理。展开更多
全球气候变化情景下,植物功能属性对于揭示植物对环境变化的响应和适应规律至关重要。本研究以内蒙古典型草原优势种羊草(Leymus chinensis)为研究对象,通过开顶式生长室(open top chamber,OTC)人工模拟增温和降雨,量化分析了羊草植物...全球气候变化情景下,植物功能属性对于揭示植物对环境变化的响应和适应规律至关重要。本研究以内蒙古典型草原优势种羊草(Leymus chinensis)为研究对象,通过开顶式生长室(open top chamber,OTC)人工模拟增温和降雨,量化分析了羊草植物功能性状对增温和增雨处理的响应。得到以下结果:1)单因素方差分析表明,增温增水和增温处理都显著增加了羊草植物株高、茎鲜质量和茎干质量,对其余指标没有显著影响;增水处理对羊草所有指标都没有显著影响(P>0.05)。2)双因素方差分析结果显示,增温增水对植物的功能性状不存在明显的交互作用(P>0.05)。3)各处理下,叶片干物质含量与比叶面积呈负相关关系。在内蒙古典型草原,未来气候暖湿化对羊草的生长在一定程度上起促进作用。展开更多
Sweet sorghum has become an important feedstock for bioethanol production. Total sugar yield and multiple harvests can directly affect ethanol production cost. Little is known about stem traits and multiple harvests t...Sweet sorghum has become an important feedstock for bioethanol production. Total sugar yield and multiple harvests can directly affect ethanol production cost. Little is known about stem traits and multiple harvests that contribute to sugar yield in sweet sorghum. Stem traits were evaluated from 25 sweet and grain sorghum accessions. Stems were harvested twice at the soft-dough stage and the stems were pressed with a hydraulic press. Sugars in the stem juice were quantified by high performance liquid chromatography. Sweet sorghum produced five times more fresh stem weight and dry stem mass (830 gand164 g) than grain sorghum (150 gand27g). Sweet sorghum produced a much higher volume of juice and higher yield of sugars (366 ml and42 g) per stem than grain sorghum (70 ml and4 g). Significant variability in fresh stem weight (72 - 1837 g), juice volume (31 - 753 ml), sugar yield (3 - 81 g), dry stem mass (14 - 383 g), and sugar yield/dry stem mass ratio (0.11 - 0.53) per stem was detected among sweet sorghum accessions. Stem sugar yield was significantly correlated with stem fresh weight and juice volume. Sorghum was harvested twice within one growing season resulting in some sweet sorghum accessions producing double amount of sugars. Sweet sorghum produced three times more dry mass weight (bagasse) than fermentable sugar weight. To reduce feedstock cost, methods have to be developed for efficiently utilizing bagasse. Our results showed high fresh stem weight, high ratio of sugar yield to dry stem mass, and double harvests are prime traits to boost sugar yield. Sweet sorghum may be suitable for multiple harvests in certain regions of theU.S.TheU.S.sweet sorghum collection needs to be screened for acces- sions that can be harvested twice with an extended feedstock-production season and used as a feedstock for sustainable and renewable bioenergy production.展开更多
文摘以牡丹江32为试材,研究密度和插秧株数对水稻群体茎蘖数动态、最大叶面积指数、干物重积累及产量的影响,研究发现,为保证水稻较高群体茎蘖数需提高增加每穴插秧株数至4~6株,较小的每穴占地面积有利于群体茎蘖数的提高,最佳行距×株距为36 cm ×12 cm ,这与常规栽培方式一致。增加每穴插秧株数可显著增加最大叶面积指数,这种增加作用主要是通过增加每平方米茎蘖数实现的,而增加每穴占地面积对最大叶面积指数有降低作用。成熟期干物重与每穴插秧株数及每穴面积相关性不显著,通径分析表明,增加每穴插秧株数有增加干物重的趋势,而扩大每穴面积会减小干物重。每平方米茎蘖数、成熟期干物重、最大叶面积指数与产量呈显著或极显著正相关。对于牡丹江32水稻品种,插秧规格40 cm ×10 cm 或30 cm ×12 cm ,每穴插秧4~6株,产量可达到8635.4、8634.0 kg·hm -2,二者差异不大,显著或极显著大于其他处理。
文摘全球气候变化情景下,植物功能属性对于揭示植物对环境变化的响应和适应规律至关重要。本研究以内蒙古典型草原优势种羊草(Leymus chinensis)为研究对象,通过开顶式生长室(open top chamber,OTC)人工模拟增温和降雨,量化分析了羊草植物功能性状对增温和增雨处理的响应。得到以下结果:1)单因素方差分析表明,增温增水和增温处理都显著增加了羊草植物株高、茎鲜质量和茎干质量,对其余指标没有显著影响;增水处理对羊草所有指标都没有显著影响(P>0.05)。2)双因素方差分析结果显示,增温增水对植物的功能性状不存在明显的交互作用(P>0.05)。3)各处理下,叶片干物质含量与比叶面积呈负相关关系。在内蒙古典型草原,未来气候暖湿化对羊草的生长在一定程度上起促进作用。
文摘Sweet sorghum has become an important feedstock for bioethanol production. Total sugar yield and multiple harvests can directly affect ethanol production cost. Little is known about stem traits and multiple harvests that contribute to sugar yield in sweet sorghum. Stem traits were evaluated from 25 sweet and grain sorghum accessions. Stems were harvested twice at the soft-dough stage and the stems were pressed with a hydraulic press. Sugars in the stem juice were quantified by high performance liquid chromatography. Sweet sorghum produced five times more fresh stem weight and dry stem mass (830 gand164 g) than grain sorghum (150 gand27g). Sweet sorghum produced a much higher volume of juice and higher yield of sugars (366 ml and42 g) per stem than grain sorghum (70 ml and4 g). Significant variability in fresh stem weight (72 - 1837 g), juice volume (31 - 753 ml), sugar yield (3 - 81 g), dry stem mass (14 - 383 g), and sugar yield/dry stem mass ratio (0.11 - 0.53) per stem was detected among sweet sorghum accessions. Stem sugar yield was significantly correlated with stem fresh weight and juice volume. Sorghum was harvested twice within one growing season resulting in some sweet sorghum accessions producing double amount of sugars. Sweet sorghum produced three times more dry mass weight (bagasse) than fermentable sugar weight. To reduce feedstock cost, methods have to be developed for efficiently utilizing bagasse. Our results showed high fresh stem weight, high ratio of sugar yield to dry stem mass, and double harvests are prime traits to boost sugar yield. Sweet sorghum may be suitable for multiple harvests in certain regions of theU.S.TheU.S.sweet sorghum collection needs to be screened for acces- sions that can be harvested twice with an extended feedstock-production season and used as a feedstock for sustainable and renewable bioenergy production.