柑桔园步甲科天敌昆虫种类记述     

吴彤林  赵同贵  章伟廉 《安徽农业科学》2008,36(32)

报道了黔西南州柑桔园调查捕食性步甲的结果,详细描述了步甲科5属10种步甲科天敌昆虫的分类地位、形态特征,并简述其生活习性及发生程度。  相似文献   

十二烷基伯胺乙酸盐盐析法在柑桔皮果胶提取中的应用     

王淑敏  侯志敏  张雪倩 《安徽农业科学》2008,36(10):3960-3961

[目的]筛选出最佳的果胶提取工艺。[方法]以十二烷基伯胺的乙酸盐溶液作为果胶的沉降剂,提取柑桔皮果胶。[结果]在pH3.5,温度50℃的稀果胶萃取液中加入十二烷基伯胺乙酸盐溶液,可与带负电荷果胶形成不溶于水的果胶十二胺盐复合物,完全沉降析出,再经过酸解和乙醇洗涤步骤,得到灰分低于1%的果胶,产率高达16.8%。[结论]十二烷基伯胺乙酸盐盐析法提取工艺可以用于高效率制备优质果胶,为利用废弃物开发生物大分子多糖-果胶开辟了新的途径。  相似文献   

琼中绿橙害虫及天敌种类调查   总被引：1，自引：0，他引：1       下载免费PDF全文

邱海燕  付步礼  李善光  唐良德  刘奎 《农学学报》2018,8(12):18-23

为了摸清琼中绿橙的害虫、天敌种类及发生情况,为制定害虫防治策略提供依据。采用网捕、踏查、徒手采集、震落、灯诱及色板诱集相结合的方法,于2014年12月-2017年9月对琼中绿橙害虫及天敌进行了调查。结果表明：危害琼中绿橙的害虫共有9目33科69种,其中柑橘木虱、柑橘潜叶蛾、螨类、天牛、尺蠖及凤蝶对其危害较重;琼中绿橙害虫天敌共有8目11科19种,主要以捕食性天敌蜘蛛、瓢虫及鳞翅目害虫寄生蜂为主。  相似文献   

华中丘陵红壤的水分问题　Ⅳ.桔园红壤的水分状况   总被引：4，自引：0，他引：4       下载免费PDF全文

姚贤良 《土壤学报》1998,35(2):210-217

1990-1993年在江西省第四纪红色粘土发育的红壤并掺有第三纪红砂岩风化体的桔园红壤进行了水分性质和水分状况的研究。结果表明,由于桔园红壤中粘粒含量比附近的典型粘质红壤中低,-15MPa土水势时的土壤含水量较低,相应就提高了桔园红壤中的有效含水量。还发现,一年中桔园红壤0-100cm土体内的贮水量较低,即使在丰雨的上半年,土体中也出现低于有效水的含水量范围,这可能与柑桔生长的耗水较大和心上层的土壤容重较大等因素有关。但在100cm以下土层中全年的贮水量都较丰富。桔园红壤0-100cm土体内,不论在上半年或在下半年,其W_f.c值均小于1,反映了其贮水库容中尚存在较大的空间可继续蓄水。  相似文献   

湖北省纽荷尔脐橙园土壤营养状况及其对果实品质的影响   总被引：7，自引：4，他引：7       下载免费PDF全文

鲍江峰  夏仁学  彭抒昂  李国怀 《土壤》2006,38(1):75-80

以纽荷尔脐橙为试材,于2002年测定了湖北省秭归县柑橘良种示范场、兴山县高阳镇宝坪村、巴东县东瀼口镇雷家坪村、长阳县渔峡口镇岩松坪村、公安县卷桥水库白云山园艺场、阳新县王英镇石港村、通城县园艺场、丹江口市蔡家渡果园场的纽荷尔脐橙园0~40cm土层的营养状况,分析了相应果园2003年纽荷尔脐橙果实的主要品质。结果表明:供试果园土壤pH值适宜柑橘的生长发育和品质表现,但碱解N普遍缺乏,而其他土壤养分指标差异明显,有机质含量除了秭归县和丹江口市处于低量水平、通城县处于偏低水平外,其他均属适宜范围;有效P含量除了兴山县、长阳县和通城县属于适宜范围外,其他均属缺乏范围;速效K含量表现极不平衡,秭归县处于极缺范围,丹江口市和通城县处于缺乏范围,巴东县处于适宜范围,而兴山县、长阳县、阳新县和公安县处于高量范围。在这种土壤背景下生产出的纽荷尔脐橙果实的主要品质产生很大差异。多元线性逐步回归分析结果表明,土壤养分对纽荷尔脐橙果实品质有很大影响。在一定范围内,可溶性固形物含量与有效P和速效K含量存在显著的线性相关关系,可滴定酸含量和果皮亮度值与土壤pH值、碱解N和速效K含量呈显著的线性负相关。  相似文献   

桔皮总黄酮的提取条件   总被引：9，自引：1，他引：9  

王立娟 《东北林业大学学报》2006,34(5):70-72

为了获得桔皮总黄酮的提取条件,研究乙醇质量分数、料液比、提取温度、提取时间及提取次数等因素对桔皮总黄酮提取的影响,结合正交试验设计,得到桔皮总黄酮的最佳提取条件,即:以70%乙醇为提取剂,料液比1∶20,提取温度75℃、提取4次,每次提取时间45min。在此条件下,桔皮总黄酮的提取率为3.46%(以芦丁计)。在最佳工艺条件下,试验的变异系数为1.24%,回收率为104.51%,表明试验的手段和分析方法可行,重现性好。  相似文献   

Comparative analysis of some selected macronutrients of soil in orange orchard and degraded forests in Chittagong Hill Tracts,Bangladesh     

Mohammad Shaheed Hossain Chowdhury  Shampa Biswas  Md. Abdul Halim  S. M. Sirajul Haque  Nur Muhammed  Masao Koike 《林业研究》2007,18(1):27-30

Status of organic carbon （C）, total nitrogen （N）, available potassium （K）, calcium （Ca） and phosphorus （P） in three different depths （0-5 cm, 5-15 cm and 15-30 cm） on two hill slopes of 35% and 55% in orange orchard cultivated by the Mro tribe of Chittagong Hill. Tracts （CHTs） were evaluated and compared with those in degraded bush forests, through digging three profiles in each land use. The content of all the five nutrients was found to be higher in the soil of orange orchard than in the soil of forest. But the variation was not consistent for both the slopes. The content varied depth wise also, having the highest value in surface soil in case of both the land uses on both the slopes. A mean available K content was significantly higher in orange orchard than in forest on 55% slope, while it was lower on 35% slope. Surface soil contained the nutrients of K and Ca with the amount of 0.2905-mg·g^-1 soil and 3.025-mg·g^-1 soil respectively in the orchard, while 0.1934-mg·g^-1 soil and 1.6083-mg·g^-1 soil were respectively in the forest. Organic carbon and total nitrogen were found more or less similar in surface soil on both the land uses showing a slight difference. Available P was found only in orange orchard, and in forest it was too little in amount to detect by the spectrophotometer. The degraded forests were poor in nutrient content due to high rate of soil erosion, which would be possible to be improved by bringing it under tree cover as proved by the adaptation of orange orchard there.  相似文献   

柑桔乳酸菌饮料制作工艺的研究     

郭丽  朱林  孔晓玲 《农业机械学报》2006,37(8):52-55

对柑桔乳酸菌饮料的工艺进行了研究。结果表明,柑桔汁最佳发酵工艺条件:发酵温度41℃,接种量8%,果胶酶添加量0.02%,发酵时间34h。用质量分数为0.5%黄原胶和0.3%CMC作为稳定剂添加到发酵液中,再用质量分数为30%左右的蔗糖进行调配,研制出的柑桔乳酸菌饮料色泽鲜艳,均匀澄清,酸甜可口,营养丰富,具有柑桔和乳酸的特有清香。  相似文献   

Riparian plant composition in an urbanizing landscape in southern California,U.S.A.     

Amber S. Oneal  John T. Rotenberry 《Landscape Ecology》2008,23(5):553-567

In coastal southern California, natural riparian corridors occur in a landscape mosaic comprised of human land uses (mainly urban and suburban development) interspersed among undeveloped areas, primarily native shrublands. We asked, does the composition of the landscape surrounding a riparian survey point influence plant species distribution, community composition, or habitat structure? We expected, for example, that invasive non-native species might be more abundant as the amount of surrounding urbanization increased. We surveyed 137 points in riparian vegetation in Orange County, California, along an urbanization gradient. Using logistic regression we analyzed 79 individual plant species’ distributions, finding 20 negatively associated and 12 positively associated with the amount of development within a 1-km radius around the survey points, even after accounting for the effects of elevation. However, after summarizing plant community composition with Detrended Correspondence Analysis we observed that, overall, community composition was not statistically correlated with the amount of development surrounding a survey point once the association between development and elevation was taken into account. Non-native species were not particularly associated with increasing development, but instead were distributed throughout vegetation and urbanization gradients. However, the extent of the tree and herb layers (structural attributes) was associated with development, with the tree layer increasing and the herb layer decreasing as urbanization increased. Thus, although the degree of surrounding urbanization appears to influence the distribution of a number of individual plant species, overall composition of the community in our study system seemed relatively unaffected. Instead, we suggest that community composition reflected larger-scale environmental conditions, such as stream order and other variables associated with elevation, and/or regional-scale disturbances, such as historic grazing or enhanced atmospheric deposition of nitrogen.  相似文献   

塑料袋闷杀柑桔大实蝇虫果死亡率调查(英文)     

胡光灿  易继平  张国平 《农业科学与技术》2014,(5):858-859

[目的]探索经济、高效、无污染的杀死柑桔大实蝇幼虫的科学方法。[方法]选择塑料袋加某一浓度的杀虫剂和不加杀虫剂闷处柑桔大实蝇幼虫的方法,得出幼虫死亡数据,并进行方差分析。[结果]处理5 d后,塑料袋封口不加药处理和塑料袋封口加药处理幼虫死亡率无明显差异;与加药不封闭处理相比,在隔绝空气的条件下更易杀死柑桔大实蝇幼虫。[结论]塑料袋封口不加药处理更经济有效,且不污染环境。  相似文献