Aquitanian Planktonic Foraminifera from Erben Guyot

Planktonic foraminifera occur in the limy sediment of a manganese-coated breccia from the top of Erben Guyot, a sunken island which is located about 800 miles west of San Diego, California. The fauna suggests an age of Early Miocene (Aquitanian Stage), which represents an absolute age of more than 25 million years. Bathyal foraminifera in the sample indicate considerable subsidence between the suggested time of truncation (Oligocene) of the seamount and the accumulation of the foraminiferal fauna.     

Seasonal Oxygen Isotopic Variations in Living Planktonic Foraminifera off Bermuda

Seasonal variations in the oxygen-18/oxygen-16 ratio of calcite shells of living planktonic foraminifera in the Sargasso Sea off Bermuda are a direct function of surface water temperature. Seasonal occurrence as well as depth habitat are determining factors in the oxygen isotopic composition of planktonic foraminifera. These relationships may be used to determine the seasonal temperature contrast of oceans in the past.     

湿生扁蕾种子处理和田间覆盖试验

2004年在甘肃省临潭县进行了湿生扁蕾种子处理和田间覆盖试验,结果表明:赤霉素能有效提高湿生扁蕾种子的发芽率,其中以浓度300 mg／L的赤霉素处理发芽率最高,高于对照37．00％;采用40℃温水浸种发芽率提高 9．00％,并可加快发芽速度;湿生扁蕾在15℃的环境条件下发芽率可达最高,播种时间以5月上旬为宜;采用85％遮光率的遮阳网覆盖,湿生扁蕾出苗率最高,达9．29％;秸秆+遮阳网覆盖和秸秆覆盖出苗率也极显著地高于对照．地膜等具有显著增温效应的覆盖材料不宜用于湿生扁蕾．     

方形人工鱼礁单体流场效应的PIV试验研究

采用粒子图像测速(PIV)二维流场测速技术和水槽模拟试验研究了人工鱼礁的流场效应,对单体开口比分别为0、0.04、0.16、0.25的人工鱼礁在来流流速分别为67、112、180 mm/s时产生的流场效应进行分析。结果表明:单体人工鱼礁流场效应中,开口比和来流流速均对流场效应产生影响,开口比越小,来流流速越大,流场中的上升流流速和背涡流面积就越大。研究表明,影响流场效应的主要因素是开口比,来流流速的影响程度次之。     

方形人工鱼礁单体流场效应的PIV试验研究

采用粒子图像测速（PIV）二维流场测速技术和水槽模拟试验研究了人工鱼礁的流场效应,对单体开口比分别为0、0.04、0.16、0.25的人工鱼礁在来流流速分别为67、112、180 mm/s时产生的流场效应进行分析.结果表明：单体人工鱼礁流场效应中,开口比和来流流速均对流场效应产生影响,开口比越小,来流流速越大,流场中的上升流流速和背涡流面积就越大.研究表明,影响流场效应的主要因素是开口比,来流流速的影响程度次之.     

基于GPS技术的水田平地机的设计与试验

【目的】设计基于GPS技术的水田平地机,实现水田精准平整.【方法】GPS接收天线固定在平地铲上,以GPS高程定位数据作为平地铲高程信息,通过限幅平均滤波算法和PD控制算法实现平地铲运动精确和稳定的控制.【结果和结论】经GPS技术控制的水田平地机平整后的田块田面相对高程的标准偏差值由15.8 cm减小到4.7 cm,绝对差值在不大于5 cm的采样测量点累积百分比数达85.4%,限幅平均滤波算法减少了GPS高程数据误差.GPS高程定位数据能满足水田精准平整的要求,能有效改善田面平整状况.     

香蕉新品种比较试验

【目的】筛选出适合广西地区种植的优质高产香蕉品种。【方法】2010年以威廉斯B6为对照,对巴西、美泉一号和桂选08073个香蕉品种进行品种比较试验,测定其生育期、果实性状、产量、抗病性等,并进行数据分析比较。【结果】美泉一号的生育期最短,为299d,比对照早熟17d,平均株产25.5kg,比对照增产8%;桂选0807的生育期最长,为322d,比对照晚熟16d,平均株产23.9kg,比对照增产1%;巴西的生育期与对照基本相同,比对照减产2%。在抗病性方面,巴西表现最好,美泉一号、威廉斯B6和桂选0807表现也较好。【结论】美泉一号的综合性状最好,可扩大示范和推广种植。     

Mechanisms of nitrogen retention in forest ecosystems: a field experiment

Intensive forest management led to elevated losses of nitrogen from a recently harvested loblolly pine plantation in North Carolina. Measurements of nitrogen-15 retention in the field demonstrated that microbial uptake of nitrogen during the decomposition of residual organic material was the most important process retaining nitrogen. Management practices that remove this material cause increased losses of nitrogen to aquatic ecosystems and the atmosphere.     

慢速渗滤土地处理系统的改进试验研究

传统的污水慢速渗滤土地处理系统以污水的深度处理和利用为主要目标,水力负荷较小。试验对传统的土地处理系统进行改进,在土壤1 m深处设置排水系统,增大系统水力负荷。试验结果表明,在大水力负荷情况下,改进的污水慢速渗滤土地处理系统对污染物有较好地去除效果,出水水质优良。除总氮外各指标浓度均满足《地面水环境Ⅲ类水域水质标准》要求。     

Foraminifera: distribution of provinces in the Western north atlantic

All published distributional data on recent benthic foraminifera of the North American Atlantic continental margin were archived into computerized catalogs. Cluster analysis of these data delimited seven large, marginally overlapping provinces exhibiting a congruous relationship with western North Atlantic water masses. The single major latitudinal faunal change occurs at Cape Hatteras.     

Founder effects persist despite adaptive differentiation: a field experiment with lizards

The extent to which random processes such as founder events contribute to evolutionary divergence is a long-standing controversy in evolutionary biology. To determine the respective contributions of founder effects and natural selection, we conducted an experiment in which brown anole (Anolis sagrei) lizard populations were established on seven small islands in the Bahamas, from male-female pairs randomly drawn from the same large-island source. These founding events generated significant among-island genetic and morphological differences that persisted throughout the course of the experiment despite all populations adapting in the predicted direction-shorter hindlimbs-in response to the narrower vegetation on the small islands. Thus, using a replicated experiment in nature, we showed that both founder effects and natural selection jointly determine trait values in these populations.     

水稻“3414”肥料效应田间试验报告

通过"3414"水稻肥效试验结果,获得肥料效应函数方程,由此数学模型得出理论氮、磷、钾最佳施肥量。三元二次方程得出的最佳施肥量为:N:9.78kg/667m2、P2O5:1.55kg/667m2、K2O:5.25kg/667m2,最佳产量538.97kg/667m2。一元二次方程得出:N:9.13kg/667m2,最佳产量551.19kg/667m2;P2O5:2.64kg/667m2,最佳产量552.13kg/667m2;K2O:6.11kg/667m2,最佳产量530.88kg/667m2。结合当地农业生产实际,氮、磷、钾建议施用量分别为:N:9.5kg/667m2、P2O5:2.5kg/667m2、K2O:6.0kg/667m2。     

毒死蜱乳油防治水稻三化螟秧田药效试验

试验结果表明:480克/升毒死蜱乳油对水稻三化暝有较好的防治效果,80克/667m2、65克/667m2、50克/667m23个剂量防效分别达到86.78%、86.77%、83.36%;防治秧田枯心苗于三化暝卵孵化高峰期施药效果最佳;同时使用480克/升毒死蜱乳油防治水稻三化螟以每667m250~65克为宜。     

水稻田空心莲子草防治试验

针对移栽稻田空心莲子草进行五氟磺草胺、2,4-D胺盐、2甲4氯钠盐3种除草剂防治试验。结果表明,该3种除草剂对空心莲子草均有较好的防治效果,25%五氟磺草胺悬浮剂有效成分262.0 g·hm^-2的处理防效最好,达100.0%,187.5 g·hm^-2防效为93.4%;86%2,4-D胺盐水剂1 075.0、1 613.0 g·hm^-2的防效分别为84.7%、97.8%;13%2甲4氯钠盐水剂390.0、780.0 g·hm^-2的防效分别为82.3%、95.9%。3种药剂对水稻安全。     

柑橘溃疡病田间药剂防治试验初报

柑橘溃疡病是一种国际性检疫性病害,严重制约了脐橙的发展。溃疡病的发生降低了果实品质和产量,也影响果实外观,降低了果农的经济效益。为了有效的控制溃疡病的发生,进行了溃疡病药剂防治试验,筛选出了能有效防治溃疡病的药剂,提高了柑橘溃疡病防治效果。     

蓝暮组培苗移栽存活对比试验

【目的】研究影响蓝莓组培苗大棚炼苗的各种因子,以提高蓝莓组培苗的生产效率。【方法】以兔眼蓝莓为试材,分别进行不同浓度IBA溶液蘸根、季节、气候条件、时间段及空气湿度对组培苗移栽存活影响的对比试验。【结果】蓝莓组培苗以移栽时不使用任何生根剂处理的存活率最高;蓝莓组培苗在秋冬季出瓶移栽效果最好,存活率在80%以上,春季次之,存活率在70%以上,夏季不适合蓝莓组培苗出瓶移栽;不同时间段移栽组培苗存活率高低次序为:傍晚>早上>中午,晴天中午移栽存活率最低,仅为71%,阴天傍晚最高,达83%;在一定湿度范围内,空气湿度越高,组培苗的存活率越高,其中以在苗床上方搭建小拱棚并覆盖一层透明薄膜处理空气湿度最高,移栽组培苗存活率达93%。【结论】蓝莓组培苗移栽时无需使用IBA等生根剂处理即可获得理想的效果;季节对蓝莓组培苗移栽存活有影响,春季和秋冬季适合蓝莓组培苗出瓶移栽;移栽当天的气候条件对组培苗出瓶移栽有影响,但不显著;空气湿度对蓝莓组培苗移栽存活有显著影响,在苗床上方搭建小拱棚并覆盖一层透明薄膜可明显提高存活率。     

水稻田使用秸秆腐熟剂试验效果分析

选用3种秸秆腐熟剂进行田间试验,研究秸秆腐熟剂对秸秆腐熟、土壤养分及水稻产量性状的影响。结果表明,秸秆腐熟剂加速了秸秆腐烂,增加了土壤养分含量,提高了水稻产量。     

战氏生物农残降解剂草莓田间试验研究

战氏生物农残降解剂,是一种具有提高农药效力、快速降解农药残毒的生物制剂,它还具有提高农作物产量和改善品质的良好作用。草莓是一个最容易被农药污染的作物。为了进一步验证战氏生物农残降解剂的作用,我们在北洋市丈头农业示范基地草莓生产田中安排对比试验。1试验材料1.1试     

Mariner 9 celestial mechanics experiment: gravity field and pole direction of Mars

Analysis of the Mariner 9 radio-tracking data shows that the Martian gravity field is rougher than that of Earth or the moon, and that the accepted direction of Mars's rotation axis is in error by about 0.5 degrees . The new value for the pole direction for the epoch 1971.9, referred to the mean equatorial system of 1950.0, is right ascension alpha= 317.3 degrees +/- 0.3 degrees , declination delta = 52.6 degrees +/- 0.2 degrees . The values found for the coefficients of the low-order harmonics of Mars's gravity field are as follows: J(2)=(1.96+/-0.01)x10(-3), referred to an equatorial radius of 3394 kilometers; C(22) = -(5 +/- 1) x 10(-5); and S(22) = (3 +/- 1) x 10(-5). The value for J(2) is in excellent agreement with the result from, Wilkins' analysis of the observations of Phobos. The other two coefficients imply a value of (2.5 +/- 0.5) x 10(-4) for the fractional difference in the principal equatorial moments of inertia; the axis of the minimum moment passes near 105 degrees W.     

甘蔗肥料利用率比较小区试验

为提高甘蔗肥效,进行了甘蔗肥效利用率比较试验。试验以宿根第一年的新台糖22号为试验材料,设9个处理,3个重复,对产量、肥料利用率、经济效益、供肥能力指标进行分析,结果表明,测土配方施肥技术有明显的增收节本效果,具有重要的推广价值。