物理农业工程技术在南药发展中的应用现状     

周劲松  赵东兴  陈林杨 《热带作物学报》2016,36(11):111-115

近年来，物理农业在我国北方地区受到重视，并在一些农业产业投入和运用，其技术价值和优点在生产过程已显示出来。随着物理农业工程技术在国际与国内市场的不断完善和发展，有可能成为我国第四代农业发展方向。以云南为例，分析当前南药发展现状，充分论述利用当地气候资源、地理优势及物理农业工程技术优势发展云南南药的必要性。并预测在发展过程中将要面临的各种困难，最后提出运用物理农业工程技术发展南药产业的建议。  相似文献   

间型鸡(从)(Termitomyces intermedius):一个分布于南亚热带至温带南缘的物种     

黄秋菊  图力古尔  张明  周巍  王超群  李泰辉 《食用菌学报》2017,(3):74-78

分别对2016年采自河南省信阳市和2017年采自广东省广州市的部分鸡(从)(Termitomyces spp.)标本进行形态学鉴定和基于ITS序列的分子系统学分析.发现了一个中国新记录种——间型鸡(从)(T.intermedius),它可分布于南亚热带至温带南缘,比2016年在日本冲绳石垣岛发现的分布区域更靠北端.同时发现河南省温带南缘有小鸡(从)(T.microcarpus)分布,是已报道的中国鸡(从)分布区域的最北端.  相似文献   

南亚热带2月低温预测模型及其应用   总被引：2，自引：1，他引：2  

陈家豪  徐宗焕  张潍民  陈家文  吴仁烨 《福建农林大学学报(自然科学版)》2006,35(4):337-341

以周期图分析法和方差分析法对南亚热带的代表地漳州市1961-2004年共44 a历年2月各旬日最低气温旬均值和旬极端最低气温资料进行数学模拟,寻找南亚热带地区2月各旬低温的变化规律,建立了可以应用于南亚热带地区的2月各旬日最低气温旬均值变化趋势和各旬极端最低气温变化趋势的预测模型,分析了南亚热带地区2月低温出现的趋势.  相似文献   

南亚热带7种林分凋落叶养分含量的年动态变化     

卢立华  蔡道雄  贾宏炎  何日明 《林业科学》2009,45(4)

2006-05-2007-04对广西凭祥市7种主要林分凋落叶的N,P,K,Ca及Mg含量进行分析.结果表明:林分凋落叶的N,P,K,ca及Mg含量全年月份动态变化趋势较为一致;在林木生长旺盛的高温雨季4-9月,林分凋落叶的N及P养分含量较高,而K的含量较低;在林木生长缓慢或休眠的干旱低温季10月至翌年3月,凋落叶N及P养分的含量较低,而K的含量较高,说明林分凋落叶的N与P含量与林木生长量成正相关,而K与生长量成负相关;Ca随月份的变化较小,但不同林分之间的差异较大;Mg随月份的变化较大;西南桦凋落叶N含量最高(14.44 g·kg-1),火力楠最低(5.11 g·kg-1);次生林凋落叶P含量最高(1.20 g·kg-1),马尾松最低(仅0.53 g·kg-1);K也以次生林最高(5.16 g·kg-1),马尾松最低(1.71 g·kg-1);Ca以杉木最高(达11.10 g·kg-1),马尾松最低(仅3.76g·kg-1);Mg以次生林最高(3.03 g·kg-1),马尾松最低(1.18 g·kg-1);7种林分凋落叶的N,P,K,Ca与Mg的最高与最低含量比值都超过2.  相似文献   

云南中亚热带禾本科高产饲草引种试验     

袁福锦吴文荣  艾有林刘霞余永华  黄必志 《四川草原》2006,(5):5-7

在云南中亚热带试验点,对8个禾本科饲草栽培种进行引种栽培试验,结果表明:墨西哥类玉米、8493墨西哥类玉米、大力士甜高粱、先锋高丹草和M-8IE甜高粱5个栽培种干物质产量高,适应性强,适宜在相似气候条件地区推广种植。  相似文献   

Effect of short‐term supplementation with rumen‐protected fat during the late luteal phase on reproduction and metabolism of ewes     

N. M. Hashem  S. Z. El‐Zarkouny 《Journal of animal physiology and animal nutrition》2014,98(1):65-71

This study was designed to study the effect of short‐term supplementation with rumen‐protected fat during the late luteal phase on reproduction and metabolism of sheep during breeding season. Seventy‐six ewes (Rahmani, Barki and Awassi × Barki) were allocated to two groups considering genotype: the control ewes (C‐group) received a maintenance diet, and the fat‐supplemented ewes (F‐group) received the maintenance diet plus 50 g/head/day of rumen‐ protected fat (Megalac) for 9 days during which oestrus was synchronized. The latter had been accomplished using double intramuscular injection of prostaglandin F_2α (PGF_2α) 11 days apart. Ovarian activity, serum concentration of cholesterol, glucose, insulin and reproductive performance variables were recorded. Data were analysed considering treatment (group) and genotype. Supplementation had positive effects on the overall mean serum concentrations of cholesterol (p < 0.05), glucose (p < 0.05) on day 6 of nutritional treatment and insulin (p = 0.07) on day 8. Fat supplementation did not affect the total number of follicles, follicle populations and ovulation rate. However, fat‐supplemented Rahmani ewes tended to have higher ovulation rate compared with other breeds (treatment × breed interaction, p = 0.06). Treatment also did not affect the mean concentration of serum estradiol or progesterone. Supplemented ewes had higher conception (p = 0.06) and lambing rates (p < 0.05) compared with control. In conclusion, short‐term supplementation with rumen‐protected fat as a source of energy around breeding time improved metabolism, conception and lambing rates of ewes without effects on steroidogenic capacity and ovarian activity being apparent.  相似文献   

Climatic conditions and crop‐residue quality differentially affect N,P, and S mineralization in soils with contrasting P status     

Bachitter S. Kabba  Milkha S. Aulakh 《植物养料与土壤学杂志》2004,167(5):596-601

The substitution of the widely practiced crop‐residue burning by residue incorporation in the subtropical zone requires a better understanding of factors determining nutrient mineralization. We examined the effect of three temperature (15°C, 30°C, and 45°C) and two moisture regimes (60% and 90% water‐filled pore space (WFPS)) on the mineralization‐immobilization of N, P, and S from groundnut (Arachis hypogae) and rapeseed (Brassica napus) residues (4 t ha^–1) in two soils with contrasting P fertility. Crop‐residue mineralization was differentially affected by incubation temperature, soil aeration status, and residue quality. Only the application of groundnut residues (low C : nutrient ratios) resulted in a positive net N and P mineralization within 30 days of incubation, while net N and P immobilization was observed with rapeseed residues. Highest N and P mineralization and lowest N and P immobilization occurred at 45°C under nearly saturated soil conditions. Especially net P mineralization was significantly higher in nearly saturated than in aerobic soils. In contrast, S mineralization was more from rapeseed than from groundnut residues and higher in aerobic than in nearly saturated soil. The initial soil P content influenced the mineralization of N and P, which was significantly higher in the soil with a high initial P fertility (18 mg P (kg soil)^–1) than in the soil with low P status (8 mg P (kg soil)^–1). Residue‐S mineralization was not affected by soil P fertility. The findings suggest that climatic conditions (temperature and rainfall‐induced changes in soil aeration status) and residue quality determine N‐ and S‐mineralization rates, while the initial soil P content affects the mineralization of added residue N and P. While the application of high‐quality groundnut residues is likely to improve the N supply to a subsequent summer crop (high temperature) under aerobic and the P supply under anaerobic soil condition, low‐quality residues (rapeseed) may show short‐term benefits only for the S nutrition of a following crop grown in aerobic soil.  相似文献   

南亚热带不同中幼龄人工林溪流水水质特征     

王敏  黄钰辉  张卫强  唐洪辉  盘李军  苏木荣  甘先华 《广东林业科技》2016,32(1):1-9

以佛山云勇林场4种类型人工林为研究对象,包括针阔混交林、常绿阔叶林、桉树林和杉木林,分析不同类型人工林溪流水水质特征,并综合评价其水质等级。结果表明,不同类型人工林溪流水pH值为5.93~6.34,均为弱酸性水;同一林龄段中,针阔混交林和常绿阔叶林溪流水中总氮含量均显著低于桉树（Eucalyptussp.）林（P＜0.05）。桉树林和杉木（Cunninghamia lanceolata）林溪流水总氮含量均大于2.0 mg·L-1,超过地表水V类标准限值,为富营养型水质;不同林龄段人工林溪流水总磷含量达到地表水Ⅱ类或Ⅲ类标准。不同林龄段人工林溪流水总硬度、Cd和Hg含量达到饮用水标准,氟化物、Pb、Cu、Zn、Cr6+和As含量达到地表水I类标准。灰色关联度分析和主成分分析表明杉木林溪流水水质最好,其次为桉树林、针阔混交林和常绿阔叶林。  相似文献   

野生菊科绿肥的有机肥品质评价     

王松林  黄冬芬  刘国道  郇恒福  高玲  杨虎彪 《草地学报》2014,22(5):1131-1134

为探明我国菊科绿肥的肥用价值,分析了39份采于海南等地的菊科绿肥种质矿质养分含量,进行有机肥分级。结果表明：菊科绿肥的含氮量为0.54%~4.17%（平均为2.01%）,含磷量为0.20 %~3.33%（平均为1.36%）,含钾量为0.69%~5.05%（平均为2.41%）;菊科绿肥均为三级以上有机肥,并且绝大多数为一级与二级有机肥,三级有机肥最少。表明菊科总体上是品质较高的有机肥。  相似文献   

中亚热带侵蚀黄壤坡地润楠次生林的群落结构特征   总被引：1，自引：0，他引：1  

漆良华  张旭东  周金星  彭镇华 《华中农业大学学报》2009,28(2)

为了探讨中亚热带侵蚀黄壤坡地植被恢复模式的群落结构,以武陵山区女儿寨小流域为例,运用群落生态学的研究方法对润楠次生林的垂直层次结构、种群水平分布格局、乔木层直径与树高分布结构进行了研究.结果表明:润楠次生林群落层次结构分化明显,可分为乔木层、灌木层、草本层及层外植物4个基本层次,物种数量排序为灌木层(23种)草本层(19种)乔木层(16种).乔、灌、草重要值在10以上的主要种群有7个,其水平分布格局以聚集分布占绝对优势,占主要种群的71.43%.β分布和r分布能较好地模拟乔木层直径与树高分布结构,径阶与树高分布曲线反映乔木层中小径阶、矮小林木占多数.多数种群的聚集分布有利于促进黄壤坡地的植被恢复与重建过程,但润楠次生林林分质量较低,应辅之以积极的人工措施来改善群落结构,以充分发挥其坡地水土流失治理等功能.  相似文献