On the transplantation and cultivation ofKappaphycus alvarezii in China     

Wu Chaoyuan  Li Jiajun  Xia Enzhan  Peng Zhuosheng  Tan Shuzhi  Li Jun  Wen Zongcun  Huang Xiaohang  Cai Zulin  Chen Guojun 《中国海洋湖沼学报》1989,7(4):327-334

A 2-year study onKappaphycus alvarezii (Doty) Doty introduced to Hainan Island from the Philippines in 1985 showed promising results. The average daily growth in weight reached 10% at a favourable temperature of about 26°C. Experimental results showed that timely cutting of the plant was an effective way to obtain new cuttings for cultivation and accelerate growth. New cuttings 0.05 kg in weight are suggested to be used as “seeds” and the old plant should be harvested. At present, artificial cultivation with a type of underwater raft applicable in places where there is strong wind will expand cultivation to more regions in Hainan Province. This paper was originally published in Chinese inOceanologia et Limnologia Sinica 19(5): 410–418, 1988. The plant under discussion wasEucheuma alvarezii Doty which was previously calledE. striatum in the article, and which now becomesKappaphycus alvarezii (Doty) Doty. To the original title, “in China” was added. Only the essence of the original article was presented.  相似文献   

桂西南晚泥盆世锰矿床锰质豆鲕粒类型及其成因探讨     

曾友寅 《南方国土资源》1989,(3)

桂西南锰矿赋存于上泥盆统五指山组中段,产锰矿三层,大多由锰质豆鲕粒组成。笔者研究了下雷锰矿床的锰质豆鲕粒,按其形态、结构构造和矿物成份划分为16种类型,并据①其沉积环境属断陷深水台沟相;②富集于几个矿段;③其碳酸锰矿物δC~(13)值为-6.23～-7.78‰,说明碳源于深部岩浆;④豆鲕粒由菱锰矿,蔷薇辉石、黑云母、锰铁叶蛇纹石、绿泥石、柘榴石等热液矿物组成。因此认为,锰质豆鲕粒形成于海底热气液喷溢口及其附近热水流动带,而低温滞水带不易形成豆鲕粒。  相似文献   

Average slip rate,earthquake rupturing segmentation and recurrence behavior on the Litang fault zone,western Sichuan Province,China   总被引：3，自引：0，他引：3  

XU Xiwei  WEN Xueze  YU Guihua  ZHENG Rongzhang  LUO Haiyuan & ZHENG Bin . Institute of Geology  China Earthquake Administration  Beijing  China  . Earthquake Administration of Sichuan Province  Chengdu  China 《中国科学D辑(英文版)》2005,48(8):1183-1196

The Litang fault zone (LFZ) is an important active fault within the northwestern Sichuan sub-block. To-gether with the Garzê-Yushu, Xianshuihe, and An-ninghe fault zones on its northern, eastern and south-eastern sides, the LFZ constitutes the lateral extrusion tectonic system in the southeastern part of the Qing-hai-Tibetan Plateau[1,2] (Fig. 1). According to instru-mental records, historical recordings and field investi- gation, an earthquake (Ms7.3) occurred on its middle to south se…  相似文献   

Changes in grain-size and sedimentation rate of the Neogene Red Clay deposits along the Chinese Loess Plateau and implications for the palaeowind system     

WEN Lingjuan  LU Huayu & QIANG Xiaoke State Key Laboratory of Loess  Quaternary Geology  Institute of Earth Environment  Chinese Academy of Sciences  Xi’an  China 《中国科学D辑(英文版)》2005,48(9):1452-1462

In recent years, the Red Clay deposits underlying Quaternary loess on the Chinese Loess Plateau (north China) have attracted more attention because they show a direct and continuous record of past atmos- pheric circulation and palaeoclimatic change. Investiga- tions on Red Clay deposits through multidisciplinary methods have demonstrated an aeolian origin for the Red Clay, like the overlying Quaternary loess. The Red Clay formed during the Miocene and Pliocene[1―13]. However, the type o…  相似文献   

Author Index     

Hongling Zeng  Jinjun Ji  Guoxiong Wu 《Climatic change》2004,65(3):391-391

Authors Index

Author Index Volume 65  相似文献   

Perspectives on Chinese ground water resources   总被引：1，自引：0，他引：1  

Jiao JJ  Wen D 《Ground water》2004,42(4):488-490

  相似文献   

2020年前我国核能发展的策略和目标研究     

潘自强  沈文权 《铀矿地质》2004,20(5):257-259

本文提出了我国核电发展的 4项策略 ,明确了近中远兼顾的 3个层次的发展目标及相关的重点工程。  相似文献   

Geochemical characteristics of the slip zones of a landslide in granitic saprolite,Hong Kong: implications for their development and microenvironments   总被引：1，自引：0，他引：1  

B.-P.?Wen  N.?S.?Duzgoren-Aydin  A.?AydinEmail author 《Environmental Geology》2004,47(1):140-154

Geochemical investigations of the slip zones of a landslide in granitic saprolite revealed that they have signatures distinct from their host materials. These distinctions include stronger Si depletion, higher Al enrichment, greater LOI, significant fixations of Mn, Ba and Ce, stronger negative Eu anomalies, and greater accumulations of other rare earth elements (REE). Altogether, these geochemical characteristics indicate that: (a) the slip zones have greater abundance of clays, consistent with field and microscopic observations; (b) concentration of clay size particles within the slip zones may have been from downward leaching and deposition, and lateral transportation of Al-Si solutions and colloids through pores and fractures within the saprolite; and (c) there were prevailing oxidation and poor drainage, and occasional reduction conditions within the slip zones. It was concluded that geochemical analyses could be effective in gathering clues for understanding the development and nature of slip zones in landslide investigations.  相似文献   

Seasonal variation of carbon exchange of typical forest ecosystems along the eastern forest transect in China     

Zhang Leiming  Yu Guirui  Sun Xiaomin  Wen Xuefa  Ren Chuanyou  Song Xia  Liu Yunfen  Guan Dexin  Yan Junhua  Zhang Yiping 《中国科学D辑(英文版)》2006,49(2):47-62

The long-term and continuous carbon fluxes of Changbaishan temperate mixed forest (CBS), Qianyanzhou subtropical evergreen coniferous forest (QYZ), Dinghushan subtropical evergreen mixed forest (DHS) and Xishuangbana tropical rainforest (XSBN) have been measured with eddy covariance techniques. In 2003, different responses of carbon exchange to the environment appeared across the four ecosystems. At CBS, the carbon exchange was mainly determined by radiation and temperature. 0°C and 10°C were two important temperature thresholds; the former determined the length of the growing season and the latter affected the magnitude of carbon exchange. The maximum net ecosystem exchange (N _EE) of CBS occurred in early summer because maximum ecosystem photosynthesis (G _PP) occurred earlier than maximum ecosystem respiration (R _e). During summer, QYZ experienced severe drought and N _EE decreased significantly mainly as a result of the depression of G _PP. At DHS and XSBN, N _EE was higher in the drought season than the wet season, especially the conversion between carbon sink and source occurring during the transition season at XSBN. During the wet season, increased fog and humid weather resulted from the plentiful rainfall, the ecosystem G _PP was dispressed. The Q ₁₀ and annual respiration of XSBN were the highest among the four ecosystems, while the average daily respiration of CBS during the growing season was the highest. Annual N _EE of CBS, QYZ, DHS and XSBN were 181.5, 360.9, 536.2 and ?320.0 g·C·m^?2·a^?1, respectively. From CBS to DHS, the temperature and precipitation increased with the decrease in latitude. The ratio of N _EE/R _e increased with latitude, while R _e/G _PP, ecosystem light use efficiency (L _UE), precipitation use efficiency and average daily G _PP decreased gradually. However, XSBN usually escaped such latitude trend probably because of the influence of the south-west monsoon climate which does not affect the other ecosystems. Long-term measurement and more research were necessary to understand the adaptation of forest ecosystems to climate change and to evaluate the ecosystem carbon balance due to the complexity of structure and function of forest ecosystems.  相似文献   

敏捷开发在软件项目中的实践——以江苏省国土资源厅门户网站建设为例     

丁亮  王文娴  曹伟  温南春  汪希 《国土资源信息化》2012,(4):48-52

介绍了敏捷开发方法,并基于此方法设计和实现了江苏省国土资源厅门户网站。该网站功能齐全、结构清晰,具有良好的交互性、可扩展性和可维护性,表现出稳定的性能,并取得了良好绩效。  相似文献