排序方式: 共有25条查询结果,搜索用时 15 毫秒
11.
沿新墨西哥州岩画国家纪念馆管理区32km长的陡坡地段分布有50条侵蚀沟,其中沿土路、人行便道、天然山坡、河道分布的侵蚀沟分别为14、7、18、11条。土路、人行便道可以汇集地表径流,因而加剧沟蚀的强度。在所研究的50条沟中,有30条沟的径流来自于土路。造成土壤侵蚀和沟蚀加剧的自然因素为高强度降雨等。但研究结果表明,半干旱地区的某些开发建设项目可能是造成严重侵蚀的主要原因。 相似文献
12.
日本独立行政法人新能源产业技术综合开发机构(NEDO)近日公布了将于2011年在美国新墨西哥州运用IT技术的新一代智能电网(Smart Grid)的验证试验概要。 相似文献
13.
Effects of Panicle Nitrogen Fertilization on Non-Structural Carbohydrate and Grain Filling in Indica Rice 总被引:1,自引:0,他引:1
Grain filling, a crucial stage of grain yield formation in rice, is usually affected by the panicle nitrogen (N) fertilization. Field and pot culture experiments were conducted to explore the underlying mechanisms of N effect. Two rice cultivars with high lodging resistance were grown in the field and pot. Four panicle N fertilization treatments were conducted in 2006 and repeated in 2007. The result showed that medium level of panicle N fertilization treatment (NM) enhanced the accumulation and translocation of non-structural carbohydrate (NSC) in the stem and sheath. Compared with non-nitrogen treatment (NO), NM promoted the translocation of labeled ^13C from stem and sheath to grain. But, low level of panicle N fertilization treatment (NL) and high level of panicle N fertilization treatment (NH) showed the negative effect. The endosperm cell, grain length, and grain width of NM increased more quickly than that of NO from 4 to 10 d after anthesis. During the early period of grain filling, sucrose-phosphate synthase (EC 2.4.1.14, SPS) activity were significantly higher for the NM treatment than those of the NL and NH treatments. Sucrose synthase (EC 2.4.1.13, SuSase) activity in the grains was substantially enhanced by NM, with the duration of higher activity being longer than those of the other treatments. At maturing stage, NM significantly increased the filled grain number, the seed-setting rate, and the grain weight compared with NL and NH. The results suggest that NM have a positive effect on the activities of enzymes of physiological importance, thereby increasing the grain size and promoting grain filling. 相似文献
14.
15.
16.
一、岩牡丹属植物概述及分类岩牡丹属植物主要分布在美国南部德克萨斯州和新墨西哥州地区,由于常年的干旱炎热气候,该属各种在原产地几乎全埋在地下。植株大多单生,成年 相似文献
17.
18.
范仲先 《农村实用科技信息》2010,(8):66-66
最近,美国新墨西哥州大学辣椒研究所研究人员发现了世界上最辣的辣椒一魔鬼辣椒,是一种来自印度阿萨姆小镇的辣椒改良新品种。该辣椒红色艳丽,果型特异,单果重50克左右,斯柯维尔辛辣单位高达100万之多,一个辣椒可把一头几吨重的大象辣倒。 相似文献
19.
绵毛优若藜属藜科(Chenopodiaceae)驼绒藜属(Ceratoides)植物,是适应性较强的常绿灌木,其冠幅大,根系发达,耐风蚀沙埋,固沙性能好,是北美洲荒漠草场的重要建群种。在北美洲,从加拿大的育空地区,到美国华盛顿州的东部,北达科他州的西部,堪萨斯州的南部,一直到新墨西哥州和加利福尼亚州的南部均天然分布绵毛优若藜。美国将其用于荒漠草场改良,在美国西部干草原地区,每年冬季大量的草食家畜在绵毛优若藜灌丛中放牧,生长在加拿大北部的绵毛优若藜也是当地沙地牧场的主要饲草。 相似文献
20.