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131.
Yoshio Inoue Yoshiyuki Kiyono Hidetoshi Asai Yukihito Ochiai Jiaguo Qi Albert Olioso Tatsuhiko Shiraiwa Takeshi Horie Kazuki Saito Linkham Dounagsavanh 《International Journal of Applied Earth Observation and Geoinformation》2010
In the tropical mountains of Southeast Asia, slash-and-burn (S/B) agriculture is a widely practiced and important food production system. The ecosystem carbon stock in this land-use is linked not only to the carbon exchange with the atmosphere but also with food and resource security. The objective of this study was to provide quantitative information on the land-use and ecosystem carbon stock in the region as well as to infer the impacts of alternative land-use and ecosystem management scenarios on the carbon sequestration potential at a regional scale. The study area was selected in a typical slash-and-burn region in the northern part of Laos. The chrono-sequential changes of land-use such as the relative areas of community age and cropping (C) + fallow (F) patterns were derived from the analysis of time-series satellite images. The chrono-sequential analysis showed that a consistent increase of S/B area during the past three decades and a rapid increase after 1990. Approximately 37% of the whole area was with the community age of 1–5 years, whereas 10% for 6–10 years in 2004. The ecosystem carbon stock at a regional scale was estimated by synthesizing the land-use patterns and semi-empirical carbon stock model derived from in situ measurements where the community age was used as a clue to the linkage. The ecosystem carbon stock in the region was strongly affected by the land-use patterns; the temporal average of carbon stock in 1C + 10F cycles, for example, was greater by 33 MgC ha−1 compared to that in 1C + 2F land-use pattern. The amount of carbon lost from the regional ecosystems during 1990–2004 periods was estimated to be 42 MgC ha−1. The study approach proved to be useful especially in such regions with low data-availability and accessibility. This study revealed the dynamic change of land-use and ecosystem carbon stock in the tropical mountain of Laos as affected by land-use. Results suggest the significant potential of carbon sequestration through changing land-use and ecosystem management scenarios. These quantitative estimates would be useful to better understand and manage the land-use and ecosystem carbon stock towards higher sustainability and food security in similar ecosystems. 相似文献
132.
老挝国家地震监测台网（LEMN）是“一带一路”倡议下中国推进援外地震台网建设的又一重要工程,为了及时总结台网建设经验,从该台网的布局、组网、设备配备、台网链接方式等方面进行详细阐述,为我国未来省域地震监测台网和新时代援外台网的建设积累详实的参考资料。 相似文献
133.
老挝国家地震监测台网(LEMN)是“一带一路”倡议下中国推进援外地震台网建设的又一重要工程,为了及时总结台网建设经验,从该台网的布局、组网、设备配备、台网链接方式等方面进行详细阐述,为我国未来省域地震监测台网和新时代援外台网的建设积累详实的参考资料。 相似文献
134.
老挝万象地区基础地质调研的主要进展 总被引：9，自引：0，他引：9
经区域地质调查、专题研究及钻探工程,老挝万象地区基础地质调研取得的主要进展是:①该区地层自下而上可划分为会辛南组(P2HX)、南拉组(P2NL)、南康尚组(P2NK)、南立组(J1NL)、南舍组(J1-2NS)、班辛黑组(J2BH)、普帕纳帕陶山组(K1PP)、班纳德组(K1BN)、班塔拉组(K1BT),塔贡组(E1TG)及班塔博组(E1-2BT),其岩石地层特征可与中国滇西兰坪-思茅地区的同时代地层相对比;②在上述11个组级岩石地层单位中均获古生物资料,分属14个生物地层单位,其生物地层特征可与中国滇西兰坪-思茅地区的同时代地层相对比;③万象地区的构造变形可划分为成盐前(晚白垩世)、成盐期(古新世)、成盐后(始新世)3个时期,一级构造为塔贡叠加复式向斜、班普夸快叠加复式背斜;④含盐地层塔贡组(E1TG),为一套乳白、淡红色膏盐层及棕红、紫红色陆源细碎屑岩,膏盐层与陆源细碎屑岩构成3个明显的沉积旋回,据此可划分为3个岩性段、6个岩性层,具工业意义的钾镁盐矿均产于塔贡组下段膏盐层(E1TG1-1)中;⑤塔贡组(E1TG)可划分为滨湖、浅湖、半深湖相,在成盐过程中沉积环境发生过较明显的迁移改组,膏盐层形成于气候持续干旱、盆地基底持续下降、卤水持续补给的沉积环境。 相似文献