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| 1 | A large carbon pool in lake sediments over the arid/semiarid region, NW China显示文摘Carbon burial in lake sediments is an important component of the global carbon cycle. However, little is known about the magnitude of carbon sequestered in lake sediments over the arid/semiarid region of China(ASAC).In this study, we estimate both organic and inorganic carbon burial since *AD 1800 based on nine lakes in ASAC,and discuss the most plausible factors controlling carbon burial. Our estimates show that the annual organic carbon burial rate(OCBR) ranges from 5.3 to 129.8 g cm-2year-1(weighted mean of 49.9 g cm-2year-1), leading to a standing stock of 1.1–24.0 kg cm-2(weighted mean of 8.6 kg cm-2)and a regional sum of *108 Tg organic carbon sequestered since *AD 1800. The annual inorganic carbon burial rate(ICBR) ranges from 11.4 to 124.0 g cm-2year-1(weighted mean of 48.3 g cm-2year-1), which is slightly lower than OCBR. The inorganic carbon standing stock ranges from2.4 to 26.0 kg cm-2(weighted mean of 8.1 kg cm-2),resulting in a sum of *101 Tg regional inorganic carbon burial since *AD 1800, which is slightly lower than the organic carbon sequestration. OCBR in ASAC shows a continuously increasing trend since *AD 1950, which is possibly due to the high autochthonous and allochthonous primary production and subsequently high sedimentation rate in the lakes. This increasing carbon burial is possibly related to both climatic changes and enhanced anthropogenic activities, such as land use change, deforestation, and eutrophication in the lake. Furthermore, OCBR and ICBR are expected to continuously increase under the scenario of increasing precipitation and runoff and enhanced anthropogenic activities.The results of this research show that the buried carbon in lake sediments of the ASAC region constitutes a significant and large carbon pool, which should be considered and integrated into the global carbon cycle. | Jianghu Lan Hai Xu Bin Liu Enguo Sheng Jiangtao Zhao Keke Yu | 2015 | Chinese Journal Of Geochemistry2015，34，3： | 10 |
| 2 | Biogenic silica contents of Lake Qinghai sediments and its environmental significance显示文摘在在湖沉积的源於生物的硅石(BSi%) 的层次的变化广泛地被使用了以便学习湖生产率和 palaeoclimatic 变化。然而,源於生物的硅石(BSi ) 的起源需要为每个湖被调查,特别为大湖,作为做在 BSi 和相关环境因素的层次之间的关系。在这研究,我们测量了在金海湖集水以内在湖沉积,河沉积,和表面土壤包含的 BSi 的百分比,并且在抽取过程前后比较了硅藻和 phytoliths 的数量和形状。结果建议在湖沉积的 BSi 首先从内长的硅藻被导出;因此, BSi 层次能被用来在湖以内在主要生产率反映变化。进一步的比较证明在长期的 timescales 上,在 BSi% 的变化与在全部的器官的碳(TOC ) 和谷物尺寸的那些通常一致,反映在金海湖的主要生产率上的降水的主导的影响。然而,在短期的 timescales 上,在 BSi% 之间的关系和在 BSi% 和谷物尺寸之间的 TOC 和那不清楚或稳定。例如, BSi% 有时有谷物的 covaried 尺寸,而是它与谷物尺寸有关有时从阶段与或甚至相反地。我们推测那气候和环境过程例如冲淡效果,影响短期的 BSi% 和它的相关环境意义。作为结果, BSi% 应该在不同时间规模上有选择地被用作气候的变化的指示物。 | Bin LIU Hai XU Jianghu LAN Enguo SHENG Shuai CHE Xinying ZHOU | 2014 | Frontiers of Earth Science2014，8，4： | 4 |
| 3 | BSA-seq-based identification of a major additive plant height QTL with an effect equivalent to that of Semi-dwarf 1 in a large rice F_(2) population显示文摘Bulked-segregant analysis is a time-and cost-saving strategy for identifying major quantitative trait loci(QTL) in a mapping population. Bulked-segregant analysis combined with whole-genome sequencing(BSA-seq) was performed to rapidly identify QTL for heading date, plant height, and panicle length in a large F_(2) population derived from two landraces: Chuan 7(C7) and Haoboka(HBK). Twenty plants with extremely low or high phenotypic values for the target traits were selected from an F_(2) population of 940 plants to construct low-and high-value bulks. Three pairs of bulks for the three traits were constructed, resulting in six DNA pools. BSA-seq revealed nine QTL: four for heading date, three for plant height, and two for panicle length. These QTL were validated in a random F_(2) population or BC_(4)F_(2) populations. The major novel plant height QTL, qPH8, acting additively with an effect equivalent to that of semi-dwarf 1(sd1), is potentially valuable for hybrid rice breeding. qPH8 controls mainly the elongation of basal internodes. The C7 allele of qPH8 reduces plant height and increases lodging resistance without yield penalty, suggesting a potential role for qPH8 in improving rice plant architecture. | Bo Zhang Feixiang Qi Gang Hu Yikai Yang Li Zhang Jianghu Meng Zhongmin Han Xiangchun Zhou Haiyang Liu Mohammed Ayaad Yongzhong Xing | 2021 | The Crop Journal2021，9，6： | 3 |
| 4 | Structural and optical properties of BST thin films prepared by the sol-gol process 显示文摘 | Tianjin Zhang Haoshuang Gu Jianghu Liu | 2003 | Microelectrnic engineering2003，66，： | 1 |
| 5 | A multiple-proxy stalagmite record reveals historical deforestation in central Shandong, northern China显示文摘Evaluating anthropogenic impacts on regional vegetation changes during historical time is not only important for a better understanding of the Anthropocene but also valuable in improving the vegetation-climate models.In this study,we analyzed stable isotopes(δ^18O,δ^13C)and trace elements(Mg/Ca,Sr/Ca)of a stalagmite from Huangchao Cave in central Shandong,northern China.230Th and AMS14C dating results indicate the stalagmite deposited during 174BC and AD1810,with a hiatus between AD638 and 1102.Broad similarities of theδ^18O and trace elements in the stalagmite suggest they are reliable precipitation indexes.Theδ^13C of the stalagmite,a proxy of vegetation change,was generally consistent with local precipitation and temperature variations on a centennial-scale before the 15th century.It typically varied from–9.6‰to–6.3‰,indicating climate controlled C3 type vegetation during this period.However,a persistent and marked increasing trend in theδ^13C record was observed since the 15th century,resulting inδ^13C values from–7.7‰to–1.6‰in the next four centuries.This unprecedentedδ^13C change caused by vegetation deterioration cannot be explained by climate change but is fairly consistent with the dramatically increasing population and farmland in Shandong.We suggest that the increasing deforestation and reclamation in central Shandong began to affect vegetation in the mountain region of central Shandong since the 15th century and severely destroyed or even cleared the forest during the 16th–18th century. | Liangcheng TAN Wen LIU Tianli WANG Peng CHENG Jingjie ZANG Xiqian WANG Le MA Dong LI Jianghu LAN R.Lawrence EDWARDS Hai CHENG Hai XU Li AI Yongli GAO Yanjun CAI | 2020 | Science China Earth Sciences2020，63，10： | 1 |
| 6 | Variations in monsoon precipitation over southwest China during the last 1500 years and possible driving forces显示文摘Understanding hydroclimatic patterns and their possible driving mechanisms during distinct climate periods over the last 1500 years—such as the Medieval Warm Period(MWP),the Little Ice Age(LIA),and the Current Warm Period—is crucial for predicting future changes to monsoon precipitation in southwest China under global warming scenarios.In this study,based on ^(210)Pb and ^(137)Cs dating of surface sediments and AMS ^(14)C dating of terrestrial plant residues,we establish a robust age model that covers the last~1500 years(AD 439–2012)at Lake Yihai in southwest China.We use analyses of multiple geochemical proxy indices,including loss on ignition at 550℃,total organic carbon,total nitrogen,C/N ratios,and stable carbon isotopes of organic matter to reconstruct changes in summer monsoon precipitation at Lake Yihai during the last~1500 years.The results show that,over southwest China,warm and dry climate conditions prevailed during the MWP(AD 1000–1400)and the past 200 years,whereas conditions during the LIA(AD 1400–1800)were cold and wet.This is consistent with evidence from other geological records over southwest China,such as stalagmite and lake sediment data.Similar hydroclimatic patterns have occurred over the last 1500 years in adjacent tropical/subtropical monsoon regions where the climate is similarly dominated by the Indian summer monsoon(e.g.,South China,the South China Sea,Southeast Asia,Northeast India).We suggest that the meridional migration of the mean position of the Inter-tropical Convergence Zone,and El Niño/Southern Oscillation conditions which are linked to tropical Pacific sea surface temperature,are responsible for centennial-scale hydroclimatic patterns over southwest China and adjacent areas during the last 1500 years. | Bin LIU Enguo SHENG Keke YU Kang’en ZHOU Jianghu LAN | 2022 | Science China Earth Sciences2022，65，5： | 0 |
| 7 | Multi-objective Model Predictive Control of Grid-connected Three-level Inverter Based on Hierarchical Optimization显示文摘In order to solve the problem of weighting factors selection in the conventional finite-control-set model predictive control for a grid-connected three-level inverter,an improved multi-objective model predictive control without weighting factors based on hierarchical optimization is proposed.Four control objectives are considered in this strategy.The grid current and neutral-point voltage of the DC-link are taken as the objectives in the first optimization hierarchy,and by using fuzzy satisfaction decision,several feasible candidates of voltage vectors are determined.Then,the average switching frequency and common-mode voltage are optimized in the second hierarchy.The average ranking criterion is introduced to sort the objective functions,and the best voltage vector is obtained to realize the coordinated control of multiple objectives.At last,the effectiveness of the proposed strategy is verified by simulation results. | Ting Liu Yong Li Li Jiang Jianghu Wan Jiaqi Yu Chao Ding Yijia Cao | 2021 | Chinese Journal of Electrical Engineering2021，7，1： | 0 |
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