土壤改良剂施用量对锥栗园土壤pH和养分含量的影响

为探究土壤改良剂施用量对锥栗果园酸性土壤环境的改良效果和对土壤养分含量的影响,以福建省建瓯市某锥栗园为研究对象,设置施入土壤改良剂0(CK)、373.13(A)、746.27(B)、1119.40(C)和1492.54 kg·hm^(−2)(D)5个浓度梯度,研究不同土壤改良剂施用量对锥栗园土壤pH和养分含量(有机质、全氮、全磷、钙、镁、钾、硅)的影响。结果表明:与CK相比,D组显著提高了0~20 cm土层中镁、硅的含量,分别提高了35.3%、33.6%。B组显著提高了21~40 cm土层中有机质、全氮、全磷和硅的含量,分别提高了171.9%、52.4%、41.4%、23.1%;D组显著提高了21~40 cm土层中有机质、钾和硅的含量,分别提高了203.1%、54.8%、35.9%,同时pH值上升,有效改良土壤酸性环境。B组显著提高了41~60 cm土层中全氮、全磷、有机质的含量,分别上升了93.5%、41.7%、440.5%;D组显著提高了41~60 cm土层中有机质、全磷的含量,分别上升了297.3%、200%。不同浓度的酸性改良剂对锥栗土壤养分含量都有一定的改善效果,综合考虑土壤改良剂最适宜施加量为1492.54 kg·hm^(−2)。

土壤改良剂对小白菜品质和土壤环境的影响

以自研土壤改良剂为材料,按照蔬菜园每667 m2施入改良剂0 kg (CK)、25 kg(B25)、50 kg (B50)和75 kg (B75)设置四个处理,分析土壤改良剂对土壤pH、有机质含量以及‘小白苗’小白菜内在与外在品质的影响。结果表明,施用土壤改良剂能维持土壤pH 7.0以上,改善土壤酸化。不同土层的有机质含量表现为随着土层加深而降低。31~45 cm土层中,B25处理下有机质含量最高,为5.35 g·kg–1,显著高于CK组(P<0.05);土壤改良剂能提高小白菜VC、可溶性蛋白和游离氨基酸含量,降低硝酸盐含量。其中B75处理下,VC、可溶性蛋白和游离氨基酸的含量均为最高,与CK组差异显著(P<0.05),硝酸盐含量最低,为0.4713 mg·g–1,与其他处理差异显著(P<0.05)。适量施用土壤改良剂能增加小白菜叶长、叶宽和叶片数,提高小白菜外在品质,B25和B50处理下,小白菜地上部鲜重相比于CK组分别增加了79 g和16 g,差异显著(P<0.05)。使用自研的土壤改良剂能明显提高小白菜产量和品质,改善土壤环境。

2,4-表油菜素内酯对紫花苜蓿高温胁迫生理特性的影响

为了探究外源激素2,4-表油菜素内酯(EBR)对紫花苜蓿(Medicago sativa L.)耐热性能的影响,试验以紫花苜蓿WL525为材料,研究高温环境下喷施不同浓度2,4-表油菜素内酯对紫花苜蓿生理特性的影响。结果表明,高温胁迫下,当EBR喷施浓度为0.50 mg/L时,可以明显提高脯氨酸含量,减缓可溶性蛋白质的流失,维持植物较高的抗氧化活性。由此可见,通过施用外源激素2,4-表油菜素内酯,可以在一定程度上缓解高温胁迫对紫花苜蓿的热伤害。

基于脆弱点分析的故障注入技术

针对分布式系统规模愈发庞大的现状,提出故障搜索策略——脆弱点辅助识别算法,结合常见故障模式的故障注入模型,研究基于脆弱点分析的故障注入技术,用于搜索指定故障范围内的故障组合,从而能够快速、有效地进行故障注入,提升测试效率。

基于地址空间标识符的QEMU动态跳转优化

随着硬件技术的不断演进和软件需求的持续增长,人们对以QEMU为代表的指令集架构仿真平台的执行性能提出了更高的要求.本文针对目标架构支持虚拟内存的场景,分析了QEMU现有动态跳转处理机制及其存在的问题,根据常见虚拟内存系统的特点提出了基于地址空间标识符的动态跳转优化方案,并以RISC-V为目标架构在QEMU主线6.2.0版本上实现了该方案.实验表明,相较于原生QEMU,基于地址空间标识符的动态跳转方案提升了约12%的运行性能.

Sub-chronic Toxicity Test of Tephrosia canadida DC. in Mice

[ Objective] To observe sub-chronic toxicity of Tephrosia canadida DC. in mice and thus to evaluate their safety to be used as protein feed resources. [ Methed]Sixty-four 6-week-old healthy Kunming mice weighing about 25 g were randomly divided into four groups （ n = 16）, half male and half female. Mass ratios of basic diet to leaf meal of Tephrosia canadida DC. in group A, group B, group C and group D were 10：0, 4：1, 3：2 and 2：3, respectively. After 35-d feeding, the effects of Tephrosia canadida DC. on growth, blood and organs of mice were observed. [ Resultl Dudng the trial, all mice had normal activities, and no death and no abnormal blood index were observed. All organs of the mice in the experimental groups had no visible pathological lesion, and organ indexes had no significant difference between the experimental groups and the control group. Except that slightly abnormal histological changes appeared in liver and kidney of the mice in the group C and D, no histological change was ob- served in other organs of the experimental mice. [ Conclusion] Tephrosia canadida DC. have no adverse effects on mice, which provides a refer- ence for research about their safety in feed of other animals.