香港地区释放荔蝽卵平腹小蜂防治荔蝽   总被引：8，自引：0，他引：8  

韩诗畴  刘文惠  陈巧贤  曾炳坤  陈乃荣  林江兴  余福祥 《中国生物防治》1999,15(2):54-56

１９９６～１９９８年在香港连续３年利用荔蝽卵平腹小蜂防治荔蝽,１９９６年４月调查,放蜂的３个类型区卵块寄生率分别达８０．００％、８９．５７％和９０．００％,卵粒寄生率分别为８１．８１％、６８．７２％和８９．１６％;而对照区的卵块寄生率和卵粒寄生率仅分别为１６．６７％和１７．０７％。１９９８年５月调查,放蜂的各类型区卵块寄生率和卵粒寄生率均分别达到１００％和９９％以上;对照区的卵块寄生率和卵粒寄生率也分别高达８７．５０％和８７．９６％。同时,果园虫口密度显著降低。  相似文献   

Survival and growth of reciprocal crosses between two stocks of the Hong Kong oyster Crassostrea hongkongensis (Lam & Morton, 2003) in southern China          下载免费PDF全文

Yuehuan Zhang  Jiaqi Su  Jun Li  Yang Zhang  Shu Xiao  Ziniu Yu 《Aquaculture Research》2017,48(5):2344-2354

The Hong Kong oyster, Crassostrea hongkongensis, is one of the most economically important and well‐known oyster species in southern China. To explore the possibility of improving the performance of the Hong Kong oyster, complete diallel crosses between two oyster stocks, the Zhuhai stock (Z: fast growth line F4) and the Maowei Sea stock (M: resistant line F3), were conducted using pooled gametes. Three replicates, each consisting of two pure stocks (ZZ and MM) and two reciprocal crosses (ZM and MZ), were successfully generated. High fertilization rate and hatching level were observed among all the experimental groups, suggesting that there was no sperm–egg recognition barrier between geographic populations. Reciprocal crosses had higher survival rate compared to the pure stock crosses and the rate of survival increased with progeny growth. Growth heterosis became obvious both in larval and adult stages, and was primarily influenced by the egg origin and mating strategy at the larval stage. Also, the phenotypic traits of all progeny differed amongst the culture sites, suggesting a significant environmental effect. The Zhuhai site was more suitable for oyster aquaculture than the Maowei Sea site. Thus, our results demonstrated that crossbreeding between Zhuhai and Maowei Sea stocks of Hong Kong oyster to produce superior heterosis represents a promising means to improve the fishery yield of this species in southern China.  相似文献   

Governing climate change in Hong Kong: Prospects for market mechanisms in the context of emissions trading in China          下载免费PDF全文

Alex Y. Lo  Maria Francesch‐Huidobro 《Asia Pacific viewpoint》2017,58(3):379-387

Hong Kong continues to struggle over which environmental governance approach is in its best interest while fulfilling its environmental obligations. With regard to climate change, Hong Kong's approach is characterised by a passive form of governance that is highly dependent on China's national policy directions. This is reflected, for example, in Hong Kong having not set its own mitigation targets. Market mechanisms have received little attention in developing a city‐wide climate change strategy. A transformative impulse, China's national emissions trading scheme, may provide momentum to a market‐based approach. However, the necessary conditions for such a market mechanism to be successfully implemented in China remain relatively undeveloped. This raises question about early participation by Hong Kong. Direct benefits are likely to be limited, due to Hong Kong's economic structure and weak demand for emissions reduction. Besides, there are regulatory barriers to enforcing emissions targets and/or recognising emissions allowances and credits from China. We therefore argue that nationwide emissions trading may, at this time, present more challenges than opportunities for Hong Kong to leverage its efforts on climate change mitigation. An alternative is to promote voluntary emissions trading that will require active involvement and leadership by businesses.  相似文献   

“六大茶山”衰落原因初窥   总被引：1，自引：0，他引：1  

郭红军 《农业考古》2020,(2):225-232

云南普洱茶是历史名茶、地方特产,清代曾被列为贡茶,盛极一时。本文从普洱茶及其产地“六大茶山”的历史片断入手,回顾产、制、销等各个环节,对其近代几经沉浮却最终衰落的原因进行了初步探索。  相似文献   

香港茶诗集锦     

彭一万 《农业考古》2021,(2):154-161

香港茶诗既继承延续了祖国大陆传统茶诗的优势,古风雅韵,情真意切;又具有香港的地域特色,中西交融,文商并蓄。作者大部分是香港人士,身份多样。香港茶诗具有存史、抒怀、言志、叙事、写景、唱酬等多种特色,内涵丰富。  相似文献   

推广吸引引导——有感于香港公共图书馆的公共服务   总被引：1，自引：0，他引：1  

刘红梅 《农业图书情报学刊》2007,19(7):133-135

香港公共图书馆体系成熟,结构完整.通过推广馆藏、吸引读者依赖图书馆和引导读者利用图书馆,香港公共图书馆呈现出勃勃生机,成为广大读者及市民不可缺少的生活元素和伸手可及的社会福利.  相似文献   

低能Ar+注入樱桃萝卜点点红种子后的生物学效应     

梁秋霞  曹刚强  黄群策  秦广雍  马青荣 《勤云标准版测试》2005,(3)

选取樱桃萝卜点点红为材料,对低能Ar 离子注入其干种子后的生物学效应进行了研究。考察了其发芽率、成活率与低能Ar 注入剂量的关系,对低能Ar 注入点点红种子后其过氧化物酶(POD)的活性进行了测定,并对POD酶谱及酯酶(Est)同工酶酶谱进行分析。研究结果表明,不同剂量的低能Ar 注入都会引起种子发芽率、成活率及不同阶段的生长和发育产生变异;在1×1017Ar /cm2与3×1017Ar /cm2剂量之间点点红种子的发芽率随注入剂量的增加呈现出“马鞍型”曲线的变化趋势;成活率的变化规律与发芽率的变化规律基本一致;低剂量注入时,其POD活性随剂量的增加而升高;高剂量注入时,其POD活性随剂量的增加而降低。同工酶图谱中,POD在2.5×1017Ar /cm2和3.0×1017Ar /cm2增加一条酶带,且1.5×1017Ar /cm2和3.0×1017Ar /cm2高剂量注入时有缺失现象;酯酶(Est)在1.5×1017Ar /cm2和3.0×1017Ar /cm2剂量注入时酶带数增加,且变深。  相似文献   

香港大学电子资源采选制度研究     

黄悦深 《农业图书情报学刊》2010,22(8):63-65

通过对香港大学电子资源的采选标准、采访职责、采访流程、电子资源的管理与服务几个方面的分析,得出值得我们借鉴的经验：设立结构合理的专门机构;将重要的网络资源纳入图书馆的信息资源范围;对电子资源供应商进行规范控制。  相似文献   

读者至上以人为本——香港高校图书馆特色与启示   总被引：1，自引：0，他引：1  

王静 《农业图书情报学刊》2008,20(2):149-151,159

从馆舍、布局、读者服务、数字化、网络化建设、制度管理及人力资源配备等方面,介绍了香港高校图书馆的特色及对内地图书馆的启示。  相似文献   

粤港环境合作机制及其对我国其他区域环境合作的启示   总被引：1，自引：1，他引：1  

胡道远  马晓明  易志斌 《安徽农业科学》2009,37(14):6660-6662

随着经济的高速发展,我国的整体环境质量不断下降,跨界环境污染问题日益突出。跨界污染体现了污染的外部性特点及其与我国当前单一行政区划污染治理方式的矛盾,而行政区之间开展合作治理跨界污染是短期内以较小制度成本取得最优治理效果的合理选择,因此建立跨行政区的环境合作机制显得非常必要。粤港之间构建了有效的区域环境合作机制,在改善区域环境质量、治理跨界环境污染等方面取得了丰硕的成果。本文从组织架构、协议保障、管理手段和支撑体系建设四个方面对粤港环境合作机制进行深入剖析,并基于此对我国其他区域的跨行政区环境合作机制的建设提出建议。  相似文献