Prediction of the potential distribution and analysis of the freezing injury risk of winter wheat on the Loess Plateau under climate change

Determining the suitable areas for winter wheat under climate change and assessing the risk of freezing injury are crucial for the cultivation of winter wheat.We used an optimized Maximum Entropy(MaxEnt)Model to predict the potential distribution of winter wheat in the current period(1970-2020)and the future period(2021-2100)under four shared socioeconomic pathway scenarios(SSPs).We applied statistical downscaling methods to downscale future climate data,established a scientific and practical freezing injury index(FII)by considering the growth period of winter wheat,and analyzed the characteristics of abrupt changes in winter wheat freezing injury by using the Mann-Kendall(M-K)test.The results showed that the prediction accuracy AUC value of the MaxEnt Model reached 0.976.The minimum temperature in the coldest month,precipitation in the wettest season and annual precipitation were the main factors affecting the spatial distribution of winter wheat.The total suitable area of winter wheat was approximately 4.40×10^(7)ha in the current period.In the 2070s,the moderately suitable areas had the greatest increase by 9.02×10^(5)ha under SSP245 and the least increase by 6.53×10^(5)ha under SSP370.The centroid coordinates of the total suitable areas tended to move northward.The potential risks of freezing injury in the high-latitude and-altitude areas of the Loess Plateau,China increased significantly.The northern areas of Xinzhou in Shanxi Province,China suffered the most serious freezing injury,and the southern areas of the Loess Plateau suffered the least.Environmental factors such as temperature,precipitation and geographical location had important impacts on the suitable area distribution and freezing injury risk of winter wheat.In the future,greater attention should be paid to the northward boundaries of both the winter wheat planting areas and the areas of freezing injury risk to provide the early warning of freezing injury and implement corresponding management strategies.

Remedial Technical Measures Following Freezing Injury of Rapeseed

[Objective] The aim was to explore effects of occurrence frequency of freezing injury on rapeseed production and remedial measures. [Method] The re- search utilized three turns of freezing injury during the growth period of winter-sown rapeseed in 2013, analyzed the freezing injury resistibility and the remedial mea- sures of ten varieties（combination）. [Result] The results showed that for different va- rieties （combinations） of rapeseed, compared cutting ones with non-cutting ones, the plant silique, seeds number and seed weight increased in diverse level, ＂however, the plant yield remained the same. Correlation analysis suggested that freezing in- jury had the greatest impact on plant silique. [Conclusion] After cutting processing, yield traits were able to partially recover and showed kind of positive correlation with Plant yield.

Effects of Near-surface Low Temperature on Freezing Injury of ‘Tunisian Soft-Seed’ Pomegranate

[Objective]The paper was to explore the influence of near-surface low temperature on cultivation of soft-seed pomegranate,and to provide guidance for planting location of soft-seed pomegranate.[Method]Taking 10 soft-seed pomegranate planting plots under different site conditions as the research objects,the near-surface low temperature of 45-50 cm was dynamically monitored from December 1,2018 to February 20,2019,and comparative analysis was made based on the local meteorological data over the same period.[Result]The near-surface low temperature of each temperature monitoring point was lower than the local meteorological data,which were all in the range of low temperature causing freezing in-jury of pomegranate trees,but the degree of freezing injury was different.The variation of near-surface low temperature was positively correlated with the altitude of terrain,but negatively correlated with the difference of topography and landform.When the local topography and landform were similar,the accumulation time of near-surface low temperature was negatively correlated with the altitude of terrain,while the duration of low tem-perature directly affected the degree of freezing injury.[Conclusion]The development of soft-seed pomegranate cultivation in Tunisia along Huang Mangling region in Henan Province refers to the local meteorological data.Meantime,it is also necessary to pay attention to the impact of regional microclimate environment,especially early monitoring of near-surface temperature to select suitable site and natural conditions.

Study on Early Warning Service of Low-Temperature Chilling Injury Risk in Shenyang Facilities Agriculture

On the basis of summarizing the research on disaster risk at home and abroad, Shenyang, one of the cities with the most frequent meteorological disasters, was taken as an example. Cold chilling injury is one of the major agricultural meteorological disasters, which poses a serious threat to the sustainable development of agriculture and food security in Jilin and Shenyang. Based on meteorological observation data of recent 65 years in Shenyang and microclimate monitoring data of agricultural facilities in two years, this paper makes statistical analysis by mathematical statistics and calculates the highest outdoor temperature, the lowest indoor air temperature and the highest ceiling temperature according to the meteorological grade index of agricultural facilities’ low temperature chilling damage, low temperature and other meteorological elements of grade indicators, analysis of greenhouse production trend of greenhouse climate change, and to discuss the relationship between temperature inside and outside the greenhouse and the facility microclimate conditions in agricultural cold weather disastrous and early warning services. The results showed that in the 21st century, the number of days with low temperature of ≤-20°C increased significantly compared with those in the 1970s, 1980s and 1990s. The risk of low temperature chilling injury in facility agriculture in Shenyang was dominated by mild and moderate low temperature risk. Shenyang low temperature cold damage warning services standards to reduce the impact of chilling injury on agricultural facilities and development.

Dexamethasone prevents vascular damage in earlystage non-freezing cold injury of the sciatic nerve

Non-freezing cold injury is a prevalent cause of peripheral nerve damage, but its pathogenic mechanism is poorly understood, and treatment remains inadequate. Glucocorticoids have anti-inflammatory and lipid peroxidation-inhibiting properties. We therefore examined whether dexamethasone, a synthetic glucocorticoid compound, would alleviate early-stage non-freezing cold injury of the sciatic nerve. We established Wistar rat models of non-freezing cold injury by exposing the left sciatic nerve to cold（3–5°C） for 2 hours, then administered dexamethasone（3 mg/kg intraperitoneally） to half of the models. One day after injury, the concentration of Evans blue tracer in the injured sciatic nerve of rats that received dexamethasone was notably lower than that in the injured sciatic nerve of rats that did not receive dexamethasone; neither Evans blue dye nor capillary stenosis was observed in the endoneurium, but myelinated nerve fibers were markedly degenerated in the injured sciatic nerve of animals that received dexamethasone. After dexamethasone administration, however, endoneurial vasculopathy was markedly improved, although damage to the myelinated nerve fiber was not alleviated. These findings suggest that dexamethasone protects the blood-nerve barrier, but its benefit in non-freezing cold injury is limited to the vascular system.

Effects of Facilities Condition on Occurrence of Freeze Injury and Fresh Pod Yield of Broad Bean

Using Tongxian No.2 as material, the effects of different film-covering time, different sowing time and different planting density on the occurrence of freeze injury and yield of fresh broad beans were investigated. The randomized block design was adopted. The results showed that with the delayed film covering, the incidence of mild freeze injury and number of headless seedlings were increased correspondingly, but the yield was increased; with the delayed sowing, the branch number per plant, effective branch number per plant, incidence of mild freeze injury and number of headless seedlings were all reduced, and the broad beans, sowed on September 30 th, obtained the highest yield; planting density showed on effect on the occurrence of freeze injury, and the yield was increased with the increase of planting density. Under the same film-covering time, the incidence of freeze injury was reduced with the delayed sowing time and it showed no changes when planting density was changed, but the yield was increased with the increase of planting density and it was highest when broad bean seeds were sowed on September 30th;under the same sowing time, the incidence of freeze injury was increased with the delayed film-covering time and it showed no changes when planting density was changed, and the yield was increased with the delayed film-covering time and increased planting density; under the same planting density, the incidence of freeze injury was increased with the delayed film-covering time but was reduced with the delayed sowing time, and the yield was increased with the delayed film-covering time and it was highest when the broad bean seeds were sowed on September30 th. Under same film-covering time and sowing time, the total branch number per plant and effective branch number per plant were reduced, but the yield was increased with the increase of planting density; under same film-covering time and planting density, the incidence of freeze injury was reduced with the delayed sowing time, and the yield was highest when broad bean seeds were sowed on September30th; under same sowing time and planting density, the incidence of freeze injury and the yield were all increased with the delayed film-covering time.

Monitoring Winter Wheat Freeze Injury Using Multi-Temporal MODIS Data

Freeze injury is an usual disaster for winter wheat in Shanxi Province, China, and monitoring freeze injury is of important economic significance. The aim of this article is to monitor and analyze the winter wheat freeze injury using remote sensing data, to monitor the occurrence and spatial distribution of winter wheat freeze in time, as well as the severity of the damage. The winter wheat freeze injury was monitored using multi-temporal moderate-resolution imaging spectroradiometer （MODIS） data, combined with ground meteorological data and field survey data, the change of normalized difference vegetation index （NDVI） before and after freeze injury was analyzed, as well as the effect of winter wheat growth recovery rate on yield. The results showed that the NDVI of winter wheat decreased dramatically after the suffering from freeze injury, which was the prominent feature for the winter wheat freeze injury monitoring. The degrees of winter wheat freeze injury were different in the three regions, of which, Yuncheng was the worst severity and the largest freeze injury area, the severity of freeze injury correlates with the breeding stage of the winter wheat. The yield of winter wheat showed positive correlation with its growth recovery rate （r=0.659^＊＊ which can be utilized to monitor the severity of winter wheat freeze injury as well as its impact on yield. It can effectively monitor the occurrence and severity of winter wheat freeze injury using horizontal and vertical profile distribution and growth wheat freeze injury in Shanxi Province. recovery rate, and provide a basis for monitoring the winter

Exploring the Feasibility of Winter Wheat Freeze Injury by Integrating Grey System Model with RS and GIS

Winter wheat freeze injury is one of the main agro-meteorological disasters affecting wheat production. In order to evaluate the severity of freeze injury on winter wheat systematically, we proposed a grey-system model （GSM） to monitor the degree and the distribution of the winter wheat freeze injury. The model combines remote sensing （RS） and geographic information system （GIS） technology. It gave examples of wheat freeze injury monitoring applications in Gaocheng and Jinzhou of Hebei Province, China. We carried out a quantitative evaluation method study on the severity of winter wheat freeze injury. First, a grey relational analysis （GRA） was conducted. At the same time, the weights of the stressful factors were determined. Then a wheat freezing injury stress multiple factor spatial matrix was constructed using spatial interpolation technology. Finally, a winter wheat freeze damage evaluation model was established through grey clustering algorithm （GCA）, and classifying the study area into three sub-areas, affected by severe, medium or light disasters. The evaluation model were verified by the Kappa model, the overall accuracy reached 78.82% and the Kappa coefficient was 0.6754. Therefore, through integration of GSM with RS images as well as GIS analysis, quantitative evaluation and study of winter wheat freeze disasters can be conducted objectively and accurately, making the evaluation model more scientific.

The effect of low-temperature event on the survival and growth of Juglans mandshurica seedlings within forest gaps

In forest ecosystems, gap formation changes the allocation of abiotic resources and thus affects the survival and growth of understory plants. However, how tree seedling survival and growth respond to low-temperature events and the influencing mechanisms remain unclear. To clarify how low-temperature event limits the survival and growth of tree seedlings in the montane regions of eastern Liaoning Province, northeast China, we investigated temperature and light intensity within secondary forest gaps, and the survival and growth of Juglans mandshurica seedlings after a low-temperature event in the spring of 2014. Damage to seedlings due to low temperature sig- nificantly varied in different aspects. Seedlings in gaps on southeast-facing slopes were the most seriously damaged, followed by those in gaps on northeast-facing slopes. In contrast, seedlings in west-facing gaps and in control plots without slope aspect were not damaged. The freezing injury index for seedlings was negatively correlated with minimum temperature （r = - 0.608, P 〈 0.01）, but it was positively correlated with light intensity （r= 0.818, P 〈 0.01）. In addition, height and root collar diameter of damaged seedlings were significantly lower than those of the undamaged seedlings （P 〈 0.01） during the early growing season （April-July）, but no significant difference were observed during the late growing season （July-Oc- tober） （P 〉 0.05）. The extent of seedling damage was directly related to slope aspect. Low temperature and high light intensity were found to be the dominant factors affecting extent of damage to seedlings on southeast- and northeast-facing slopes.

Differential susceptibility of murine hemopoietic cells and lymphocytes to freezing－thawing process

The susceptibility was compared between murine bone marr ow hemopoietic cells and splenic lymphocytes to four major factors of cryopreservation process: toxicity of dimethyl sulfoxide (DMSO), cooling rate,Tris-NH4Cl treatment, and dilution after thawing. When the concentration of DMSO was over 20%, the proliferative function or viability of both kinds of cells decreased markedly. Injury to hemopoietic stem cells and lymphoeytes was found more severe in rapid cooling than in slow cooling, and the intensity of iujury seemed alike under the same fast cooling condition. Pretreatment of bone marrow cells with Tris-NH4Cl did not significantly accentuate the injury of frozen-thawed hemopoietic stem cells. Dilution of the frozen-thawed cells in ice bath or at a fast rate was harmful to both cells. No significant differential susceptibilities of the two kinds of cells to each factor were found. These results indicate that selective destruction or inactivation of lymphocytes by cold treatment among bone marrow cells may be impossible.

Human Sperm Freezing: Mini Update

Sperm freezing is widely used in ART clinics around the globe. Very little has actually changed with respect to cryopreservation protocols and methodology of freezing over the last 50 years. The aim of this paper is to briefly review the basic principles that underlie freezing and ice crystal formation and also provide a brief overview of newer sperm freezing techniques like sperm vitrification and freeze drying of sperm.

基于深度学习、小波变换和可见光谱的茶树冻害程度评估

茶树冻害鉴定是评价茶树抗逆性、指导茶园越冬管理的基础。茶树冻害鉴定的传统方法主要通过人工观察茶树叶片的冻害数量和冻害程度,存在准确率低,效率低,主观性强等缺点。提出一种基于深度学习、小波变换和可见光谱的茶树冻害程度评估框架。首先,采集了1 000张茶树受冻后的树冠图像,并且按照4∶1分为训练集和测试集,并对训练集图像的冻害叶片进行标注。其次,采用Faster R-CNN网络对茶树的冻害叶片进行识别提取,并且分别选择了AlexNet、 VGG19和ResNet50三种特征提取器,选择鲁棒性最高的特征提取器作为主干网络。然后,将提取到的茶树冻害叶片图像进行小波变换增强处理,从而得到了一张低频率和三张高频率的图像。将小波变换处理后的图像和未经小波变换处理的图像分别输入到VGG16、 SVM、 AlexNet、 ResNet50等网络对冻害叶片进行分级,比较四种网络的分类性能。根据冻害叶片的数量、冻害叶片的程度,不同冻害程度叶片的权重系数,对茶树受冻程度打分,从而对茶树整体的冻害程度进行评估。结果表明:(1)基于ResNet50的Faster R-CNN模型提取茶树冻害叶片的性能最好,其查准率为93.33%,查全率为92.57%,高于VGG19和AlexNet作为主干网络的识别性能,可以确保大多数的冻害叶片都能被提取出来,并为叶片的冻害程度进一步分级提供基础。(2)VGG16模型分类不同冻害程度的叶片的整体准确率为89%,高于其他模型(SVM、 AlexNet、 ResNet50)的整体分类准确率,表明VGG16模型具有较高的鲁棒性。(3)小波变换处理后的冻害叶片图像与未经小波变换处理后的冻害叶片相比较,能提升模型的整体分类准确率2%~6%。说明小波变换增强技术可以提高网络的准确率。因此,本实验框架可以准确和高效地将茶树冻害叶片进行分级,对于茶园冻害程度的评估具有重要价值,为北方茶园的越冬防护提供技术支撑。

水化-冻融耦合条件下大理岩蠕变损伤本构模型

为描述岩石在水化-冻融耦合条件下的蠕变特性,以大理岩为试验对象,分别开展酸性、碱性、中性溶液与不同冻融循环条件下的单轴压缩蠕变及核磁共振试验,分析T 2(弛豫时间)谱分布和蠕变试验结果,并进行耦合损伤演化,得到一个新的考虑水化-冻融与应力耦合的蠕变损伤本构模型。结果表明:1)大理岩T 2谱表现为三个谱峰,岩石以大孔径孔隙为主。2)冻融循环作用促进大理岩孔隙发育,不同溶液环境对孔隙发育影响从大到小的关系为酸性、碱性、中性。3)分别构建水化-冻融和受荷损伤变量,从而建立耦合损伤变量。基于大理岩蠕变特性,确定蠕变基础模型,进行耦合损伤演化,得到新的水化-冻融耦合条件下的大理岩蠕变损伤本构模型。4)新建模型模拟大理岩三种溶液冻融循环50次的的平均R^(2)达0.9854,远高于基础模型平均R^(2)(0.9194),说明本文新建模型对三种岩石蠕变数据辨识效果更好。

青钱柳无性系对寒驯化的生理响应及其抗寒性初步评价

青钱柳(Cyclocarya paliurus)是多功能树种,主要分布在中国亚热带地区。为筛选出抗寒性较强的品种,探究了青钱柳无性系对寒驯化的生理响应及其与抗寒性的关系,旨在为青钱柳人工林的定向培育及抗寒性鉴定提供理论参考。以寒驯化后19个青钱柳3年生无性系及黎平种源(实生苗)的当年生枝条为材料,通过测定青钱柳枝条水分质量分数、可溶性蛋白、可溶性糖、淀粉、木质素和半纤维素质量分数以及田间试验鉴定,计算了不同青钱柳无性系的冻害指数,分析了各生理生化指标与冻害指数相关性,评价了青钱柳无性系的抗寒性。结果表明,寒驯化后枝条水分质量分数、可溶性蛋白、可溶性糖、淀粉、木质素和半纤维素质量分数在青钱柳无性系间存在显著差异;根据冻害指数,聚类分析将参试青钱柳无性系的相对抗寒性分为4类:1个抗寒性强无性系(CP3)、10个抗寒性较强无性系(LF1、Y1、LC4、L1、CR4、J1、LC2、CR5、CR2和BA1)、3个抗寒性中等无性系(Q4、LS3、CP6)和黎平种源以及4个抗寒性弱无性系(LS2、S4、CR6、LC1、LS5)。相关性分析表明,枝条水分质量分数与冻害指数呈极显著正相关,而可溶性蛋白质量分数、淀粉质量分数、木质素和半纤维素质量分数与冻害指数呈显著负相关。总体看,青钱柳经过寒驯化后,当年生枝条水分质量分数和可溶性蛋白质量分数高低可作为早期筛选抗寒性强优良无性系的主要参考因子,而淀粉、木质素和半纤维素质量分数可作为筛选的辅助参考因子。供试的19个青钱柳无性系中,无性系CP3的抗寒性相对强,可作为青钱柳抗寒性选育的首选材料,而10个抗寒性较强无性系可作为潜在的选育材料。

春季低温对樱桃萌芽期和幼果期冻害的影响研究

樱桃萌芽期、幼果期低温冻害等级指标可用最低气温和低温持续时间表示.为研究春季低温对樱桃产量和品质的影响,以“萨米脱”樱桃为研究对象,利用人工气候箱设置-1℃~0℃,-2℃~-1℃,-3℃~-2℃,-4℃~-3℃共4个不同低温、及0.5,1,1.5,2,2.5,3,3.5,4 h共8个不同持续时间模拟樱桃萌芽期、幼果期的低温冻害过程,以确定樱桃萌芽期、幼果期不同等级冻害的气象指标.结果表明,遭遇低温时,温度越低、低温持续时间越长,冻害等级越高.萌芽期温度低于-1℃、持续时间大于2 h或温度低于-2℃、低温持续时间大于1.5 h时,樱桃会发生花源基褐变、萎焉并影响产量的重度以上冻害;幼果期温度低于-1℃,持续时间大于3 h或温度低于-2℃,低温持续时间大于2 h时,樱桃表皮会出现褐色斑点,果肉褐色等表征的重度以上冻害,由此可见,樱桃幼果期的耐冻能力优于萌芽期.冻害指标的确定能为低温冻害预警发布以及防御措施的实施提供重要依据.

新疆西天山峡谷不同坡位野核桃冻害特征

严重的冻害影响核桃生长发育甚至导致植株死亡。采用样方法调查新疆西天山峡谷野核桃自然保护区不同坡位野核桃的冻害情况,分析了野核桃冻害的分布特征,树高、冠幅和坡位对野核桃冻害的影响。结果表明:(1)野核桃总冻害率87.1%,其中,2级冻害株的比例最大(43.4%),其次为1级(22.5%)、3级(17.5%),4级最少(3.7%)。(2)野核桃冻害株以坡中比例最大(46.5%),其次坡底(35.9%),坡顶最少(4.7%);未受冻害株以坡顶比例最大(7.4%),其次坡底(3.3%),坡中最少(2.2%)。(3)6个树高级(H)冻害株的比例依次为:H1(43.4%)>H4(19.5%)>H6(17.0%)>H5(15.7%)>H3(4.3%)>H2(0.1%)。(4)6个冠幅级(CW)冻害株的比例依次为:CW1(43.4%)>CW4(22.1%)>CW3(20.3%)>CW5(9.5%)>CW2(2.9%)>CW6(1.8%)。(5)同一坡位不同树高级和冠幅级冻害株比例差异显著(P<0.05);1级和2级冻害株主要发生在坡中和坡底,3级和4级冻害株主要发生在坡中。(6)冻害株与胸径呈显著相关(P<0.05),与冠幅呈极显著负相关(P<0.01)。保护区的野核桃植株大部分遭受冻害,野核桃植株冻害等级比例在不同坡位、不同树高级和不同冠幅级之间差异较大。本研究结果为保护区的管理和野核桃冻害的预防提供科学参考。

基于模拟低温的福建喜温类蔬菜大棚寒冻害危险性区划

利用2020-2023年12月-翌年2月的福建省福清市、清流县代表性塑料大棚棚内气象监测数据以及同期陆面同化最低气温数据,构建晴天、多云、阴天和雨天不同天气类型下棚内最低气温回归模型,基于1991-2020年福建66个县市气象台站数据,模拟历年12月-翌年2月温室大棚内日最低气温,通过构建温室大棚喜温类蔬菜寒冻害等级指标体系,采用主客观综合权重法确定指标权重,建立寒冻害危险性评估模型,开展福建省温室大棚喜温类蔬菜寒冻害风险区划。结果表明:(1)构建的晴天、多云、阴天和雨天不同天气类型下大棚内冬季最低气温回归模型,R^(2)均>0.75,模型检验绝对误差分别为0.6℃、1.4℃、1.0℃和0.5℃;(2)福建温室大棚喜温类蔬菜寒冻害危险性低风险区主要分布在福州以南沿海县市200m以下低海拔区域;中风险区主要集中在北部沿海和南部内陆海拔200-500m地区;次高风险区主要集中在南部内陆海拔500-1000m的中高海拔山区和北部海拔200-500m地区;高风险区主要在武夷山脉、鹫峰山区、戴云山脉、博平岭和玳瑁山一带海拔1000m以上地区,造成的灾害损失大,不适宜温室大棚喜温类蔬菜种植。

抚州市近63年气温变化特征分析

利用抚州市1960—2022年气象观测站的气温资料,采用线性回归、距平计算、Mann-Kendall突变检验等方法对抚州市近63年气温的变化特征及其对农业的影响进行了分析,结果表明:(1)1960—2022年间,抚州市的年平均气温以0.202℃/10 a的幅度上升,其中20世纪70、80年代的气温明显偏冷,90年代中期后气温进入明显增暖期,年平均气温变化未发生突变;(2)年极端最低气温以0.513℃/10 a的幅度上升,冬季区域性低温冻害日数年均为4.5 d,区域性低温天气过程以持续2~5 d为主,占总次数的68.5%;(3)年极端最高气温以0.042℃/10 a的幅度上升,7月的高温天气日数出现最多,占高温总日数的41%,其次是8月,占高温总日数的35.5%,高温天气过程以持续3~5 d为主,占高温天气总次数的49.1%;(4)抚州市早稻高温逼熟发生频数空间分布不均匀,其中西北部是高值中心,而西部、南部是低值区。

冻干重组人脑利钠肽联合呋塞米对难治性心力衰竭患者血流动力学、心肌损伤及肾功能的影响

目的:探讨难治性心力衰竭(RHF)患者采用冻干重组人脑利钠肽联合呋塞米治疗,对其血流动力学、心肌损伤及肾功能的影响。方法:选择200例RHF患者为研究对象,按照治疗方案不同分为对照组(n=113)和观察组(n=87)。两组均给予基础对症治疗,对照组加用呋塞米治疗;观察组在呋塞米治疗的基础上联合冻干重组人脑利钠肽治疗。比较两组患者治疗两周后的临床疗效、血流动力学参数、心肌损伤指标及肾功能指标。结果:治疗两周后,观察组患者治疗有效率高于对照组(P<0.05);患者平均动脉压、中心静脉压等血流动力学参数,血清氨基末端脑钠肽(NT-proBNP)、心肌肌钙蛋白T(cTnT)等心肌损伤指标水平均下降,且观察组低于对照组(P<0.05);两组患者尿素氮(BUN)、血清肌酐(Scr)均降低,但两组间差异无统计学意义(P>0.05);肾小球滤过率(GFR)升高,且观察组高于对照组(P<0.05)。结论:冻干重组人脑利钠肽联合呋塞米有利于提升RHF治疗效果,改善血流动力学指标,缓解心肌损伤,保护肾功能。

不同品种梨果实晚霜冻害调查分析

【目的】为今后在梨树的栽培管理中更有效的防御晚霜危害、筛选抗晚霜性较好的优良梨品种提供参考。【方法】2023年5月6日—7日新疆库尔勒地区气温降至0℃以下,持续时间达到6 h,最低气温降至-2.63℃,此时正值梨树幼果期,调查了不同梨品种及果园不同位置的梨幼果的冻害发生情况。【结果】1)28个梨品种中,红梨2号、雪花酥抗冻性最好,受冻率分别为37.80%、39.86%,龙园洋红、雪青、红茄梨、黄金梨和冬蜜冻抗冻性次之,其余品种受冻较为严重,其中幸水、红酥脆受冻率最高,分别为90.29%、89.05%。2)梨园周边的幼果冻害发生情况比梨园中心地区严重,平均冻害综合指数高出42.68%。【结论】在今后的梨育种工作中,可将红梨2号、雪花酥、龙园洋红、雪青等品种作为抗晚霜的亲本材料进行研究。