Cover crop system has shown a potential approach to improving carbon sequestration and environmental quality. Six of each winter and summer cover crops were subsequently grown in two soils, Krome gravelly loam soil (K...Cover crop system has shown a potential approach to improving carbon sequestration and environmental quality. Six of each winter and summer cover crops were subsequently grown in two soils, Krome gravelly loam soil (KGL), and Quincy fine sandy soil (QFS), in phytotrons at 3 temperatures (10/20, 15/25, 25/30oC for winter/summer cover crops) to investigate their contributions for carbon (C) sequestration. Among winter cover crops, the highest and the lowest amounts of C accumulated were by bellbean (Vicia faba L.), 597 g/m2 and white clover (Trifolium repens), 149 g/m2, respectively, in the QFS soil. Among summer cover crops, sunn hemp (Crotalaria juncea L.) accumulated the largest quantity of C (481 g/m2), while that by castorbean (Ricinus communis) was 102 g/m2 at 30oC in the KGL soil. The mean net C remained in the residues following the 127 d decomposition were 187 g/m2 of C (73% of the total) and 91 g/m2 (52% of the total) for the winter and summer cover crops, respectively. Following a whole cycle of winter and summer cover crops grown, the mean soil organic C (SOC) increased by 13.8 and 39.1% in the KGL and QFS soil, respectively, compared to the respective soils before. The results suggest that triticale, ryegrass, and bellbean are the promising winter cover crops in the QFS soil, while sunn hemp, velvetbean (Mucuna pruriens), and sorghum sudangrass (Sorghum bicolor ×S. bicolor) are recommended summer cover crops for both soils under favorable temperatures.展开更多
你不一定熟悉希拉·埃斯科韦多这个名字,但你其实早在上世纪的许多流行名曲中听过她的鼓声;如果你是个爵士乐迷的话,你大概还听过她的经典老歌《迷人的生活》(The Glamorous Life)。这位被粉丝们奉为"爵士女神"的知名鼓...你不一定熟悉希拉·埃斯科韦多这个名字,但你其实早在上世纪的许多流行名曲中听过她的鼓声;如果你是个爵士乐迷的话,你大概还听过她的经典老歌《迷人的生活》(The Glamorous Life)。这位被粉丝们奉为"爵士女神"的知名鼓手是美国乐坛常青树之一,曾与历代天王巨星在音乐道路上并肩作战,可谓是美国爵士乐及流行乐发展的参与者及见证人。与此同时,作为打击乐界相对少见的女性成员,年近六十的希拉至今一直活力四射地在舞台上绽放光彩,给无数年轻人树立了一个榜样:It is never too late to follow your heart!展开更多
Quincy Jones 一生做过很多事情。他写过书,拍过电影,曾27次获得格莱美奖,并因做了大量的人道主义工作而获得奥斯卡荣誉奖。他也是最早担任唱片公司副总裁的黑人之一。不过也许人们最津津乐道的还是他发掘了无数音乐天才,其中最有名的...Quincy Jones 一生做过很多事情。他写过书,拍过电影,曾27次获得格莱美奖,并因做了大量的人道主义工作而获得奥斯卡荣誉奖。他也是最早担任唱片公司副总裁的黑人之一。不过也许人们最津津乐道的还是他发掘了无数音乐天才,其中最有名的一个是麦克尔·杰克逊。1976年,他制作《新绿野仙踪》电影原声唱片时,认识了初出茅庐的麦克尔·杰克逊,随后出任杰克逊首张大碟《Off The Wall》的监制。两人的第二次合作是制作了红遍全球的《Thrill》。展开更多
人在难中可能会被迫去与平日避之犹恐不及的人交上朋友。这句谚语首次出现在莎士比亚的《暴风雨》(The Tem- pest,1611)一剧中。在美国则首见于《亚当斯文集》(Writings of John Quincy Adams,1813)。此语的另外一种变化形式是: Adversi...人在难中可能会被迫去与平日避之犹恐不及的人交上朋友。这句谚语首次出现在莎士比亚的《暴风雨》(The Tem- pest,1611)一剧中。在美国则首见于《亚当斯文集》(Writings of John Quincy Adams,1813)。此语的另外一种变化形式是: Adversity makes strange bedfellows。展开更多
文摘Cover crop system has shown a potential approach to improving carbon sequestration and environmental quality. Six of each winter and summer cover crops were subsequently grown in two soils, Krome gravelly loam soil (KGL), and Quincy fine sandy soil (QFS), in phytotrons at 3 temperatures (10/20, 15/25, 25/30oC for winter/summer cover crops) to investigate their contributions for carbon (C) sequestration. Among winter cover crops, the highest and the lowest amounts of C accumulated were by bellbean (Vicia faba L.), 597 g/m2 and white clover (Trifolium repens), 149 g/m2, respectively, in the QFS soil. Among summer cover crops, sunn hemp (Crotalaria juncea L.) accumulated the largest quantity of C (481 g/m2), while that by castorbean (Ricinus communis) was 102 g/m2 at 30oC in the KGL soil. The mean net C remained in the residues following the 127 d decomposition were 187 g/m2 of C (73% of the total) and 91 g/m2 (52% of the total) for the winter and summer cover crops, respectively. Following a whole cycle of winter and summer cover crops grown, the mean soil organic C (SOC) increased by 13.8 and 39.1% in the KGL and QFS soil, respectively, compared to the respective soils before. The results suggest that triticale, ryegrass, and bellbean are the promising winter cover crops in the QFS soil, while sunn hemp, velvetbean (Mucuna pruriens), and sorghum sudangrass (Sorghum bicolor ×S. bicolor) are recommended summer cover crops for both soils under favorable temperatures.
文摘你不一定熟悉希拉·埃斯科韦多这个名字,但你其实早在上世纪的许多流行名曲中听过她的鼓声;如果你是个爵士乐迷的话,你大概还听过她的经典老歌《迷人的生活》(The Glamorous Life)。这位被粉丝们奉为"爵士女神"的知名鼓手是美国乐坛常青树之一,曾与历代天王巨星在音乐道路上并肩作战,可谓是美国爵士乐及流行乐发展的参与者及见证人。与此同时,作为打击乐界相对少见的女性成员,年近六十的希拉至今一直活力四射地在舞台上绽放光彩,给无数年轻人树立了一个榜样:It is never too late to follow your heart!
文摘Quincy Jones 一生做过很多事情。他写过书,拍过电影,曾27次获得格莱美奖,并因做了大量的人道主义工作而获得奥斯卡荣誉奖。他也是最早担任唱片公司副总裁的黑人之一。不过也许人们最津津乐道的还是他发掘了无数音乐天才,其中最有名的一个是麦克尔·杰克逊。1976年,他制作《新绿野仙踪》电影原声唱片时,认识了初出茅庐的麦克尔·杰克逊,随后出任杰克逊首张大碟《Off The Wall》的监制。两人的第二次合作是制作了红遍全球的《Thrill》。
文摘人在难中可能会被迫去与平日避之犹恐不及的人交上朋友。这句谚语首次出现在莎士比亚的《暴风雨》(The Tem- pest,1611)一剧中。在美国则首见于《亚当斯文集》(Writings of John Quincy Adams,1813)。此语的另外一种变化形式是: Adversity makes strange bedfellows。
