稻虱缨小蜂耐热品系的生物和生态学特征          下载免费PDF全文

王冰洋  黄庭发  马莹  汤冰洁  周强  张古忍 《中国生物防治学报》2021,37(4):692-700

稻虱缨小蜂Anagrus nilaparvatae Pang et Wang是控制稻飞虱种群暴发的主要寄生性天敌之一，高温是制约其种群动态的重要因子。为了解35℃高温驯化获得的稻虱缨小蜂耐热品系（NR品系）的生防潜力，对不同温度下该品系的发育历期、有效积温、寄主卵选择、产卵量以及极端高温胁迫参数进行了测定。结果发现，与未经高温驯化的稻虱缨小蜂品系（HZ品系）相比，20℃时，NR品系雄蜂的发育速率显著高于HZ品系，这一差异主要表现在卵-幼虫中期和蛹期的发育时间明显缩短。NR品系在高温下能维持正常的产卵能力，35℃下NR品系产卵量仍能达到18.80粒/雌。NR品系有更强的耐极端温度的能力，50℃下NR品系雄蜂的热击倒时间为15.19 min，比HZ品系雄蜂长3.03 min。补充不同营养对NR品系的产卵量存在影响，35℃条件下补充10%蔗糖既能延长其寿命，也能提高产卵量。以上研究结果表明高温驯化得到的稻虱缨小蜂品系在35℃高温环境中能维持正常的生长发育和寄生能力，具备适应稻田夏季高温环境的潜力。  相似文献   

青海省祁连圆柏天然林单木生物量模型构建     

陈志林  李国兴  侯晓巍  李智华  郝家田  谭智渊  向安民 《西北林学院学报》2021,36(1):204-207

利用祁连圆柏整株生物量与生长指标数据，为估算祁连圆柏林的生物量估算提供参考。通过野外调查，共获取了63株祁连圆柏天然林样木生物量与生长指标实测数据。用其中50株样木数据进行回归模拟，用其余的13株样木数据对模型可靠性进行检验，构建器官生物量与生长指标间的回归模型。结果表明，祁连圆柏单木水平下，树干生物量模型的R²_adj为0.96，均方根、模型有效性和残差系数分别为0.50、0.85和0.05；枝条生物量模型的R²_adj为0.897，均方根、模型有效性和残差系数分别为0.69、0.80和-0.66；叶生物量模型的R²_adj为0.61，均方根、模型有效性和残差系数分别为0.54、0.86和0.15；根生物量模型的R²_adj为0.93，均方根、模型有效性和残差系数分别为0.12、0.997 和-0.01。在调查数据范围内构建的模型较好地反映了祁连圆柏生物量与生长指标间的关系，形式简单、使用方便；与实测值相比，树干与叶生物量模拟值偏小，枝和根偏大。  相似文献   

Reproductive biology of the big eye Priacanthus macracanthus in the north-eastern waters off Taiwan     

Kwang-Ming Liu  Kuo-Yau Hung  Che-Tsung Chen 《Fisheries Science》2001,67(6):1008-1014

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烘烤变黄环境对烤后烟叶石油醚提取物及香吃味的影响     

艾复清  师会勤 《勤云标准版测试》2004,(6)

试验采用温湿度二因素回归最优设计,研究贵烟4号变黄阶段烘烤环境与烤后烟叶石油醚提取物含量及香吃味的关系,结果表明:在温度32℃~42℃、相对湿度75%~95%范围内,随着变黄温湿度的逐渐升高,烤后烟叶石油醚提取物含量及香吃味评吸得分均表现出先逐渐增加而后又下降的趋势;在控制变黄温度约37℃~38℃,相对湿度84%~90%即干湿差约1.5℃~2℃烤后烟叶石油醚提取物含量及香吃味评吸得分较高;分析结果还表明,烤后烟叶的石油醚提取物含量与香吃味评吸得分表现出较好的相关性。  相似文献   

电导法测定林木种子活力的研究   总被引：4，自引：0，他引：4  

郑郁善 《福建林学院学报》1989,9(2):199-202

本文研究了林木种子电导法测定条件和测定电导率或相对电导率,通过回归分析建立电导率或相对电导率与种子活力指数的相关方程,找出了电导法测定林木种子活力的方法。  相似文献   

NM－1号抗旱剂的研究     

赵廷芳  马庆  金凤  张煜杉 《内蒙古农业大学学报(自然科学版)》1994,(4)

试验结果表明谷子在—１３．９Ｐａ的负压下发芽率只有２４．０％，在—１６．７３Ｐａ时发芽率为１６．３％。用０．５％的ＮＭ—１号抗旱剂包衣后，在—１６．７３Ｐａ的负压下发芽率可达６５．６％，比对照提高４９．３％。同０．５％的ＮＭ—１抗旱剂在大豆现蕾期喷施叶面１次，相对收获株率为１１５．３８％，相对千粒量为１０７．７％，增产率为４０，２７％。玉米在６叶期喷施０．５％的抗旱剂后，饱和亏减少４．０９ｇ，是对照的４３．８１％；干物质积累比对照快６７．１９％，蒸腾系数减少８．３６ｇ。  相似文献   

西乡县桑元乡畜牧业发展的主要影响因素分析     

张丽霞  李震钟 《家畜生态》1993,14(2):16-19

应用灰色关联度分析法,对西乡县桑元乡畜牧业发展的影响因素进行分析,找出了影响该乡畜牧业发展的主要因素,并结合本地的实际情况进行分析,提出了促进该乡畜牧业发展的措施。  相似文献   

Reproductive biology of the female Japanese mantis shrimp Oratosquilla oratoria (Stomatopoda) in relation to changes in the seasonal pattern of larval occurrence in Tokyo Bay, Japan     

Keita  KODAMA  Takamichi  SHIMIZU  Takashi  YAMAKAWA  Ichiro  AOKI 《Fisheries Science》2004,70(5):734-745

ABSTRACT:   The reproductive traits and the monthly larval abundance of the mantis shrimp Oratosquilla oratoria were investigated in Tokyo Bay, Japan, in 2002. The goal of the study was to elucidate the cause of changes in the monthly pattern of larval abundance from the 1980s to the 1990s as these changes relate to variation in the stock size of the adult shrimp. Oogenesis was divided into 10 stages by histological observation. The developmental stage of oocytes in an individual's ovary was synchronous, suggesting that almost all the oocytes in an ovary are spawned at the same time. The size at first maturity was estimated to be 7 ≤ body length ( BL ) < 8 cm. Fecundity was expressed as a function of BL , ranging from 19 300 eggs for 8 cm BL to 92 100 eggs for 14 cm BL . Small female shrimps (<10 cm BL ) spawned around August. Most large female shrimps (≥10 cm BL ) spawned around May, and some large female shrimps also spawned until September. Although most large female shrimps spawned in spring, the larval abundance was low before July and high from August onwards. The results suggest that a substantial decrease in the stock size of large individuals causes the low larval abundance before July.  相似文献   

出口行业相对评价模型及应用     

赖明勇 《湖南农业大学学报(自然科学版)》1993,20(4)

This article establishes for the export industroes the index system of the assessment and disscusses the steps for using DEA model. In addition it also sets up a relative assessment model for the eport industries. Practice showsthe model is more satisfact  相似文献   

Analysis of Growth and Productivity of Indian Mustard (Brassica juncea) in Relation to FYM, Nitrogen and Source of Fertilizer     

R. H. Patel  T. G. Meisheri  J. R. Patel 《Journal of Agronomy and Crop Science》1996,177(1):1-8

A field experiment was conducted during the winter seasons of 1992–93 and 1993–94 at Anand to study the effect of FYM, nitrogen and source of fertilizer on growth and yield of mustard [ Brassica juncea (L.) Czernj & Cosson]. The results showed significant variation in leaf area index (LAI), crop growth rate (CGR), dry matter production and seed yield. The direct effect of farmyard manure (FYM) was conspicuous in improving the growth of mustard. FYM application at 10 tonnes ha⁻¹ significantly increased the LAI, CGR and dry matter accumulation per plant at almost all the stages during first year study (1992–93) and in pooled analysis. Similarly, nitrogen application registered maximum LAI, CGR at 75 kg level and RGR and NAR at 50 kg level at almost all the during both years. Sulphur carrying source (Ammonium sulphate plus single super phosphate) increased all stages growth characters. Maximum dry matter accumulation per plant and seed yield were recorded with highest levels of FYM (20 tonnes ha⁻¹), N (75 kg ha⁻¹) and source having S. Seed yield was strongly associated with LAI and dry matter accumulation per plant at all the stages.  相似文献