Although its origin has not yet reached a consensus so far, MTS （Molar-Tooth Structure） has been documented for more than 100 years. Current study reports a discovery of MTS from the Mesoproterozoic Wumishan Formati...Although its origin has not yet reached a consensus so far, MTS （Molar-Tooth Structure） has been documented for more than 100 years. Current study reports a discovery of MTS from the Mesoproterozoic Wumishan Formation, Lingyuan, Yanshan Region, North China, and the features and geological implications of MTS are further discussed. Here, straitigraphic horizons of MTS＇s occurrences show that it was mainly located within the top part of the Wumishan Formation, i.e., limestone unit. Four kinds of morphology of MTS, i.e., fine fusiform, debris, ribbon, ptigmatic and nodular （irregular）, were recognized and thought to be highly related to the sedimentary environments and facies. Geochemistry of MTS including oxides, trace elements and C, O and Sr isotopes indicates that the horizons of MTS-bearing is of higher Sr/Ba and Ca/Mg ratios, lower positive ~13C and highly negative 3180 values than the adjacent stratigraphic levels of rare MTS. Lithology, morphology and geochemistry of MTS in the Wumishan Formation suggest that MTS occurs mainly in shallow subtidal near the storm wave base, which is typically characterized by warm temperature, oversaturated calcium carbonate seawater and high organic productivity. Furthermore, occasional enrichment of algae bacteria here is more favorable for the calcification of calcium oozes and catalytic for MTS. C isotope composition of the Wumishan Formation and MTS of this study is well correlated with that of the Mesoproterozoic Belt Supergroup, North America and Riphean, Siberia, suggesting that MTS acts as a sedimentary record responding to global changes and is a perfect indicator in Precambrian stratigraphic correlation worldwide.展开更多
The pastoral complex is a product of urban-rural integrated development, an important way to build beautiful villages, and an important channel for the implementation of the rural revitalization strategy. This paper a...The pastoral complex is a product of urban-rural integrated development, an important way to build beautiful villages, and an important channel for the implementation of the rural revitalization strategy. This paper analyzed the planning and design of the pastoral complex, ranging from the planning and design ideas to the functional layout, and put forward the practical strategy of the pastoral complex planning under the rural revitalization strategy: to innovate the pastoral complex model with the construction of characteristic towns as the carrier; to achieve the goal of rural revitalization with poverty alleviation as the guide; and to enrich the pastoral complex with local culture as the reliance. In this paper, Guixi Town of Beichuan Qiang Autonomous County was selected for research to explore its unique national cultural value and ecological advantages, so as to provide perfect theories for the planning of rural towns and explore a new direction of the construction of beautiful villages.展开更多
The construction of industrial parks under the civil-military integration strategy is based on the combination of military technology and civil technology. Such an industrial park is a new urban functional area produc...The construction of industrial parks under the civil-military integration strategy is based on the combination of military technology and civil technology. Such an industrial park is a new urban functional area produced in the context of civil-military integration. Compared with industrial parks in the usual sense, it pays more attenteon to scientific research, innovation, cooperation and communication. In this paper, through in-depth analyses of relevant literature and domestic actual situation, the industrial park's basic advantages and external environmental policies were interpreted, and the application prospect and practical significance of the current civil-military integration policy were analyzed based on the platform strategy of the civil-military integration industrial park. With R & D industrial parks as the object of study, this paper clarified the management of enterprises in this type of parks and the support provided by the parks, sorted out the industrial park planning plan under the civil-military integration strategy in accordance with the current economic situation and policy orientation, and finally reached the conclusion that the construction of the construction of R & D industrial parks under the civil-military integration strategy is a new growth point that will drive the deepening reform of the national economy and the sustained development of the national economy.展开更多
[目的]当前国内已有的小麦氮肥用量推荐方法,尤其是基于测土进行的推荐施肥方法,都存在取样量大、测试工作量大和成本较高的问题,难以被农技推广工作者和小农户接纳与应用推广.为此,本文就一种至少2-3年有效的氮肥用量推荐方法进行研究....[目的]当前国内已有的小麦氮肥用量推荐方法,尤其是基于测土进行的推荐施肥方法,都存在取样量大、测试工作量大和成本较高的问题,难以被农技推广工作者和小农户接纳与应用推广.为此,本文就一种至少2-3年有效的氮肥用量推荐方法进行研究.[方法]以低有机质含量土壤维持或提高土壤肥力、高有机质土壤降低环境风险为目的,建立基于土壤有机质含量的旱地小麦施氮量推荐方法,施氮量(kg N·hm^-2)=目标产量需氮量(kg N·hm^-2)×施氮系数(Nf).施氮系数(Nf)由表层土壤有机质含量高低确定.应用这一方法在渭北旱塬冬小麦种植区6县进行了3年田间试验.[结果]基于有机质推荐氮肥施用量平均为161 kg N·hm^-2,比农户习惯施肥(平均为190 kg N·hm^-2)减少了15.3%;而相应的冬小麦平均籽粒产量为5817 kg·hm^-2,比农户习惯施肥显著提高了9.0%.此外,与农户习惯施肥相比,基于有机质含量推荐施肥的经济效益增加了1451元/hm^2,提高19.3%,小麦收获期1 m土层的硝态氮残留降低了39 kg·hm^-2,显著降低28.3%.[结论]基于土壤有机质含量推荐施肥降低了氮肥施用量并提高了冬小麦籽粒产量,增加了经济效益,降低了土壤硝态氮残留量和施肥的环境风险,可在旱地小麦区推广应用.展开更多
基金supported by the National Natural Science Foundation(No.40772078)the marineoil and gases exploration progress project of SINOPIC'Petroleum Geology Research and Oil Potential Prospect of the Precambrian stratigraphy of the North China Platform(No.GB0800-06-ZS-350)Foundation of Geology Institute of CAGS(No.J0903,No.J1106)
文摘Although its origin has not yet reached a consensus so far, MTS （Molar-Tooth Structure） has been documented for more than 100 years. Current study reports a discovery of MTS from the Mesoproterozoic Wumishan Formation, Lingyuan, Yanshan Region, North China, and the features and geological implications of MTS are further discussed. Here, straitigraphic horizons of MTS＇s occurrences show that it was mainly located within the top part of the Wumishan Formation, i.e., limestone unit. Four kinds of morphology of MTS, i.e., fine fusiform, debris, ribbon, ptigmatic and nodular （irregular）, were recognized and thought to be highly related to the sedimentary environments and facies. Geochemistry of MTS including oxides, trace elements and C, O and Sr isotopes indicates that the horizons of MTS-bearing is of higher Sr/Ba and Ca/Mg ratios, lower positive ~13C and highly negative 3180 values than the adjacent stratigraphic levels of rare MTS. Lithology, morphology and geochemistry of MTS in the Wumishan Formation suggest that MTS occurs mainly in shallow subtidal near the storm wave base, which is typically characterized by warm temperature, oversaturated calcium carbonate seawater and high organic productivity. Furthermore, occasional enrichment of algae bacteria here is more favorable for the calcification of calcium oozes and catalytic for MTS. C isotope composition of the Wumishan Formation and MTS of this study is well correlated with that of the Mesoproterozoic Belt Supergroup, North America and Riphean, Siberia, suggesting that MTS acts as a sedimentary record responding to global changes and is a perfect indicator in Precambrian stratigraphic correlation worldwide.
文摘The pastoral complex is a product of urban-rural integrated development, an important way to build beautiful villages, and an important channel for the implementation of the rural revitalization strategy. This paper analyzed the planning and design of the pastoral complex, ranging from the planning and design ideas to the functional layout, and put forward the practical strategy of the pastoral complex planning under the rural revitalization strategy: to innovate the pastoral complex model with the construction of characteristic towns as the carrier; to achieve the goal of rural revitalization with poverty alleviation as the guide; and to enrich the pastoral complex with local culture as the reliance. In this paper, Guixi Town of Beichuan Qiang Autonomous County was selected for research to explore its unique national cultural value and ecological advantages, so as to provide perfect theories for the planning of rural towns and explore a new direction of the construction of beautiful villages.
文摘The construction of industrial parks under the civil-military integration strategy is based on the combination of military technology and civil technology. Such an industrial park is a new urban functional area produced in the context of civil-military integration. Compared with industrial parks in the usual sense, it pays more attenteon to scientific research, innovation, cooperation and communication. In this paper, through in-depth analyses of relevant literature and domestic actual situation, the industrial park's basic advantages and external environmental policies were interpreted, and the application prospect and practical significance of the current civil-military integration policy were analyzed based on the platform strategy of the civil-military integration industrial park. With R & D industrial parks as the object of study, this paper clarified the management of enterprises in this type of parks and the support provided by the parks, sorted out the industrial park planning plan under the civil-military integration strategy in accordance with the current economic situation and policy orientation, and finally reached the conclusion that the construction of the construction of R & D industrial parks under the civil-military integration strategy is a new growth point that will drive the deepening reform of the national economy and the sustained development of the national economy.
文摘[目的]当前国内已有的小麦氮肥用量推荐方法,尤其是基于测土进行的推荐施肥方法,都存在取样量大、测试工作量大和成本较高的问题,难以被农技推广工作者和小农户接纳与应用推广.为此,本文就一种至少2-3年有效的氮肥用量推荐方法进行研究.[方法]以低有机质含量土壤维持或提高土壤肥力、高有机质土壤降低环境风险为目的,建立基于土壤有机质含量的旱地小麦施氮量推荐方法,施氮量(kg N·hm^-2)=目标产量需氮量(kg N·hm^-2)×施氮系数(Nf).施氮系数(Nf)由表层土壤有机质含量高低确定.应用这一方法在渭北旱塬冬小麦种植区6县进行了3年田间试验.[结果]基于有机质推荐氮肥施用量平均为161 kg N·hm^-2,比农户习惯施肥(平均为190 kg N·hm^-2)减少了15.3%;而相应的冬小麦平均籽粒产量为5817 kg·hm^-2,比农户习惯施肥显著提高了9.0%.此外,与农户习惯施肥相比,基于有机质含量推荐施肥的经济效益增加了1451元/hm^2,提高19.3%,小麦收获期1 m土层的硝态氮残留降低了39 kg·hm^-2,显著降低28.3%.[结论]基于土壤有机质含量推荐施肥降低了氮肥施用量并提高了冬小麦籽粒产量,增加了经济效益,降低了土壤硝态氮残留量和施肥的环境风险,可在旱地小麦区推广应用.
