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Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South China

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Journal of Integrative Agriculture 2021年第1期20卷 236-247页

作者： HUANG Wan WU Jian-fu PAN Xiao-hua TAN Xue-ming zeng yong-jun SHI Qing-hua LIU Tao-ju zeng Yan-hua Key Laboratory of Crop Physiology Ecology and Genetic BreedingMinistry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/College of AgronomyJiangxi Agricultural UniversityNanchang 330045P.R.China

Long-term straw return is an important carbon source for improving soil organic carbon(SOC) stocks in croplands, and straw removal through burning is also a common practice in open fields in South China. However, the specific effects of long-term rice straw management on SOC fractions, the related enzyme activities and their relationships, and whether these effects differ between crop growing seasons remain unknown. Three treatments with equal nitrogen, phosphorus, and potassium nutrient inputs, including straw/ash and chemical nutrients, were established to compare the effects of straw removal(CK), straw return(SR), and straw burned return(SBR). Compared to CK, long-term SR tended to improve the yield of early season rice(P=0.057), and significantly increased total organic carbon(TOC) and microbial biomass carbon(MBC) in double-cropped rice paddies. While SBR had no effect on TOC, it decreased light fraction organic carbon(LFOC) in early rice and easily oxidizable organic carbon(EOC) in late rice, significantly increased dissolved organic carbon(DOC), and significantly decreased soil p H. These results showed that MBC was the most sensitive indicator for assessing changes of SOC in the double-cropped rice system due to long-term straw return. In addition, the different effects on SOC fraction sizes between SR and SBR were attributed to the divergent trends in most of the soil enzyme activities in the early and late rice that mainly altered DOC, while DOC was positively affected by β-xylosidase in both early and late rice. We concluded that straw return was superior to straw burned return for improving SOC fractions, but the negative effects on soil enzyme activities in late rice require further research.

关键词： double-cropped rice paddy system straw return straw burned return SOC fractions soil enzyme activities

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Effects of different mechanical direct seeding methods on grain yield and lodging resistance of early indica rice in South China

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Journal of Integrative Agriculture 2021年第5期20卷 1204-1215页

作者： WANG Wen-xia DU Jie ZHOU Yan-zhi zeng yong-jun TAN Xue-ming PAN Xiao-hua SHI Qing-hua WU Zi-ming zeng Yan-hua Key Laboratory of Crop Physiology Ecology and Genetic BreedingMinistry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping RiceCollege of AgronomyJiangxi Agricultural UniversityNanchang 330045P.R.China

Direct seeding of rice has become a main planting method due to the low labor input and high economic benefit in South *** direct seeding(DDS)has been widely used for single-season rice planting ***,few studies have examined the performance of early-season indica rice under mechanical dry direct seeding.A two-year field experiment was conducted with two indica rice cultivars(i.e.,Zhongjiazao 17 and Zhuliangyou 819)to study lodging characteristics and grain yield formation under DDS,flooded direct seeding(FDS)and wet direct seeding(WDS)*** results showed that the annual grain yield in DDS was higher by 14.42–26.34%for cultivar ZLY819 and 6.64–24.58%for cultivar ZJZ17 than in WDS and FDS,respectively,and these increases were mainly attributed to the improvement of the *** DDS pattern significantly increased the seedling emergence rate of early indica rice cultivars,and increased total dry weight and crop growth ***,shorter basal internodes,better stem diameter and stem wall thickness and lower lodging index were found in DDS in contrast to FDS and *** particular,DDS improved the stem lodging *** results suggested that the appropriate direct seeding method was beneficial for improving the grain yield and lodging resistance of early indica rice.

关键词： mechanical dry direct seeding early indica rice grain yield lodging resistance South China

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Liming reduces soil phosphorus availability but promotes yield and P uptake in a double rice cropping system

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Journal of Integrative Agriculture 2020年第11期19卷 2807-2814页

作者： LIAO Ping Mart BHROS Natasja VAN GESTEL SUN Yan-ni ZHANG jun HUANG Shan zeng yong-jun WU Zi-ming Kees Jan VAN GROENIGEN Key Laboratory of Crop Physiology Ecology and Genetic BreedingMinistry of Education/Jiangxi Agricultural UniversityNanchang 330045P.R.China Wageningen Environmental Research Wageningen University&ResearchWageningen 6700 AAthe Netherlands Department of Biological Sciences Texas Tech UniversityLubbockTX 79409USA Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081P.R.China Department of Geography College of Life and Environmental SciencesUniversity of ExeterExeter EX44 RJUK

Liming is often applied to alleviate soil acidification and increase crop yield on acidic soils,but its effect on soil phosphorus(P)availability is unclear,particularly in rice *** objective of this study was to examine the effect of liming on rice production,yield and P uptake in a three-year field experiment in a double rice cropping system in subtropical *** also conducted an incubation experiment to investigate the direct effect of liming on soil available P and phosphatase activities on paddy soils in the absence of *** the incubation experiment,liming reduced soil P availability(measured as Olsenextractable P)by 14–17%and inhibited the activity of soil acid ***,lime application increased grain yield,biomass,and P uptake in the *** increased grain yield and P uptake more strongly for late rice(26 and 21%,respectively)than for early rice(15 and 8%,respectively).Liming reduced the concentration of soil available P in the field as well,reflecting the increase in rice P uptake and the direct negative effect of liming on soil P *** together,these results suggest that by stimulating rice growth,liming can overcome direct negative effects on soil P availability and increase plant P uptake in this acidic paddy soil where P is not the limiting factor.

关键词： crop yield subtropical phosphatase activity phosphorus availability soil acidification

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Coronary aneurysm and very late stent thrombosis formation associated with sirolimus-eluting stent implantation

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Chinese Medical Journal 2009年第24期122卷 3097-3098页

作者： XIE Hong-zhi ZHANG Shu-yang zeng yong SHEN Zhu-jun FANG Quan Department of Cardiology Peking Union Medical College Hospital Peking Union Medical College Beijing 100730 China

Since drug-eluting stents （DES） can significantly reduce the risk of instant restenosis compared with bare-metal stents, they have been widely used in interventional therapy for coronary heart disease. With bare-metal stents being rapidly replaced by DES there is a great concern about the safety of DES due to stent *** late stent thrombosis （VLST） has been categorized as occurring beyond 1 year.3 Coronary aneurysm formation induced stent malapposition is a rare but potentially fatal cause of VLST. We report a case of coronary aneurysm with VLST formation 35 months after sirolimus-eluting stent （SES） implantation.

关键词： drug-eluting stent coronary aneurysm very late stent thrombosis

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Y型分子筛催化剂的表面酸性及其催化性能

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华东理工大学学报（自然科学版） 2008年第5期34卷 635-640页

作者：曾拥军于海江施力华东理工大学石油加工研究所上海200237

利用吡啶吸附红外光谱(Py-IR)和X射线衍射法表征了磷钨酸(PW)、氢氧化铌改性分子筛的表面酸性和结构,用催化法脱除芳烃中微量烯烃的烷基化反应研究其酸催化性质。结果表明:催化剂的结构、表面酸含量和磷钨酸、氢氧化铌在催化剂中所占的... 详细信息

利用吡啶吸附红外光谱(Py-IR)和X射线衍射法表征了磷钨酸(PW)、氢氧化铌改性分子筛的表面酸性和结构,用催化法脱除芳烃中微量烯烃的烷基化反应研究其酸催化性质。结果表明:催化剂的结构、表面酸含量和磷钨酸、氢氧化铌在催化剂中所占的比例,都显著地影响烷基化反应;Dawson结构的磷钨酸比Kiggen结构的磷钨酸具有较好的催化烷基化反应活性;随着磷钨酸含量的增加,催化剂B酸量先增加后减少,L酸量减少;随着氢氧化铌含量的增加,总B酸量和L酸量都减少,催化剂的活性随总B酸量与总L酸量比值的增加而提高;用磷酸或草酸处理氢氧化铌,总B酸量与总L酸量的比值增大,可进一步提高分子筛的活性和寿命。研究结果还表明:强B酸不利于脱烯烃反应。

关键词：红外光谱酸性磷钨酸氢氧化铌 Y型分子筛

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程序自动脱壳数据采集技术研究

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计算机应用 2009年第3期29卷 813-816页

作者：曾勇军朱俊虎奚琪信息工程大学信息工程学院郑州450002

自动提取加壳程序隐藏的代码和数据是目前恶意代码检测技术面临的重要问题。分析了加壳程序运行的本质特征,给出了存储器监控算法和动态基本块标记算法,描述了基于QEMU仿真器的程序自动脱壳数据采集系统的设计思路。实验结果表明,该系... 详细信息

自动提取加壳程序隐藏的代码和数据是目前恶意代码检测技术面临的重要问题。分析了加壳程序运行的本质特征,给出了存储器监控算法和动态基本块标记算法,描述了基于QEMU仿真器的程序自动脱壳数据采集系统的设计思路。实验结果表明,该系统可以有效地提取被加壳程序的代码和数据,完整地记录程序脱壳的执行行为。

关键词：脱壳 QEMU仿真器数据采集基本块

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南美前陆盆地斜坡带低幅度构造的识别方法

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石油地球物理勘探 2010年第A1期45卷 134-136页

作者：方光建曾永军孔令洪中国石油勘探开发研究院西北分院甘肃兰州730020 中国石油勘探开发研究院北京100083

南美A区前陆盆地低幅构造由构造和沉积两种成因共同形成,低幅度构造的幅度小、圈闭面积小、识别难度大,利用常规构造解释和成图技术难以精确描述低幅度构造。文中结合该盆地斜坡带低幅度构造的特点,在前人研究的基础上,有针对性地提出... 详细信息

南美A区前陆盆地低幅构造由构造和沉积两种成因共同形成,低幅度构造的幅度小、圈闭面积小、识别难度大,利用常规构造解释和成图技术难以精确描述低幅度构造。文中结合该盆地斜坡带低幅度构造的特点,在前人研究的基础上,有针对性地提出了几种低幅度构造的识别方法,其中相干体方法、切片方法适用于构造运动成因形成的低幅度构造,构造剩余量方法和积分地震道方法更适用于沉积成因形成的低幅度构造。综合利用各种识别方法,提高了该区低幅度构造识别的准确率。

关键词：前陆盆地低幅度构造成因幅度识别方法油气勘探

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外资银行进入模式选择:基于网点的信贷竞争

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管理工程学报 2017年第2期31卷 64-73页

作者：徐振业曾勇邓光军赵武电子科技大学经济与管理学院四川成都611731

网点是银行的主要渠道资源,对竞争有重要影响。在网点规模方面,中资大小银行间存在巨大差异,这将影响外资银行入股模式下的选择;中资银行的网点规模远超过外资银行,这将影响外资银行独立发展模式下的竞争力。基于此,本文扩展经典Salop模... 详细信息

网点是银行的主要渠道资源,对竞争有重要影响。在网点规模方面,中资大小银行间存在巨大差异,这将影响外资银行入股模式下的选择;中资银行的网点规模远超过外资银行,这将影响外资银行独立发展模式下的竞争力。基于此,本文扩展经典Salop模型,建立了银行间基于网点的信贷竞争模型,其中,银行通过网点吸收信贷资金,并通过网点竞争借款者,银行间进行有资金约束的竞争。本文分析了银行网点规模的格局对外资银行进入模式选择的影响。

关键词：网点进入模式 Salop模型信贷竞争资金约束

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