用双磷酸淀粉增强牛皮箱板纸强度的试验     

邱肇荣  刘彦龙 《吉林林学院学报》1998,14(3):141-144

在牛皮箱板纸的面浆中添加少量的双磷酸淀粉，具有较好的增强效果，如与化学合成助剂配合使用，其效果更为明显．此方案是一条增强纸板强度、投资少、见效快的有效途径．  相似文献   

中国莲PHT1家族成员的生物信息学分析     

毛立彦  龙凌云  黄秋伟  唐毓玮  金刚  黄寿辉  谢振兴  於艳萍 《分子植物育种》2020,(5):1428-1437

以植物PHT1家族蛋白为研究对象,基于中国莲(Nelumbo nucifera)全基因组数据库,利用生物信息学方法发掘中国莲可能存在的PHT1家族成员,并对中国莲PHT1家族成员进行序列比对、系统进化、保守序列、跨膜结构、二级结构和亚细胞定位等分析。结果表明,从中国莲全基因组数据库中筛选获得4个PHT1蛋白,分别命名为:Nn PHT1:1、NnPHT1:2、NnPHT1:3、NnPHT1:4。它们在植物PHT1家族中属于GroupⅠ,均含有保守序列:GGDYPLSATIxSE。该序列具有11~12个跨膜区域,且保守序列位于第4个跨膜区域内,均定位于细胞质膜,且在细胞内侧第6和第7个跨膜区域之间均含有一个较大的细胞胞质内环结构;磷酸化位点和糖基化位点的数量范围分别在33~50个和4~9个;二级结构中α-螺旋和无规卷曲结构的数量总和均高于70%。研究结果展示了中国莲的PHT1家族成员的序列基本信息和结构特点,为深入研究中国莲的该家族成员基因及其编码蛋白的结构功能提供理论依据。  相似文献   

不同磷肥用量及施用方式对土壤有效磷分布和冬小麦产量的影响   总被引：1，自引：0，他引：1  

李娟茹  孙明清  张辉  宋小颖  侯大山  高倩  张广辉  徐彩玲  邰风雷  刘鑫翠  李光  常苑苑 《农学学报》2021,11(9):28-32

为了最大程度提高磷肥的增产潜力,实现冀中南施肥减量增效,通过田间试验和室内检测的方法,研究了以固体磷肥全部底施为对照,不同施磷处理对土壤有效磷分布和冬小麦产量及产量因素的影响。结果表明：（1）与习惯施磷肥方式相比,水肥一体化喷施液磷肥可使20~60 cm土层有效磷含量提高明显;（2）减少基施固体磷肥,改为春季水肥一体化喷施液态磷肥,可增加穗粒数和千粒重,提高冬小麦产量;（3）磷肥施用宜底施固体(P₂O₅) 90 kg/hm²的基础上,春季喷施液态(P₂O₅) 30 kg/hm²小麦产量效果为佳。底施固体磷肥,并在春季分2次平均水肥一体化追施液体磷肥,可实现磷肥施用“下移增效”。  相似文献   

根际耐盐真菌分离筛选及溶磷促生性能分析     

谭海霞  李丽艳  杜迎辉  孙杉杉  王连龙  董雪  王玉玺  张颖 《作物杂志》2021,37(3):149-1160

溶磷微生物可提高土壤中有效磷含量,但目前筛选的溶磷菌株在盐渍化土壤中应用的潜力有限。以滨海盐生植物根际土壤为材料,分离筛选可用于盐碱土改良的高效耐盐解磷菌株,为盐碱土生物菌肥的研制提供优质菌种资源。结果表明,北戴河湿地及曹妃甸湿地的3种原生盐地植物根际土壤中共分离筛选无机磷降解菌株5株和有机磷降解菌株3株,命名为C1-C7和G1,均能耐受10%的盐浓度。菌株间解磷能力差异显著,D/d为1.05~1.81,无机磷降解菌解磷量为26.61~4415.00mg/L,与对照相比有效磷增量为0.80~4371.10mg/L;有机磷降解菌解磷量为1.96~5.79mg/L,有效磷增量-3.40~0.20mg/L,有效磷含量与D/d之间相关性不强。其中菌株C1降解无机磷能力最强,溶磷量达4397.70mg/L,吲哚乙酸（IAA）分泌量为33.07mg/L,经分子鉴定该菌株为草酸青霉,是一株高效耐盐解磷菌,兼具促生作用,可以考虑作为盐碱地改良菌肥的重点菌种,与植物协同改良修复中重度盐碱土,可有效提高盐碱地土壤肥力,有更好的应用潜力。  相似文献   

Soil properties related to phosphate buffering in calcareous soils     

《Communications in Soil Science and Plant Analysis》2012,43(2):125-137

Abstract

In a group of 24 related calcareous soils, derived from Jurassic oolitic limestone, there was marked variability (13‐fold) in phosphate buffering when expressed as the maximum buffer capacity. This variability was most closely related to the iron content and pH of the soils, and these together accounted for 72% of the variance. This percentage was not increased by including CaC0₃ content or organic matter, which were also correlated with the maximum buffer capacity. A high correlation with specific surface area of CaCO₃ was probably an indirect effect due to the high correlation between this variable and the Fe and pH of the soils.

The equilibrium buffer capacity, which is the traditional measure of phosphate buffering, was less variable but quite unrelated to all the soil properties measured except the soil surface area. However the maximum buffer capacity and quantity of adsorbed P together accounted for 63% of the variance in this parameter.  相似文献   

一株溶磷细菌的分离、鉴定及其溶磷特性研究   总被引：4，自引：0，他引：4  

孙珊  黄星  范宁杰  冯昭中  李会会  李顺鹏 《土壤》2010,42(1):117-122

从作物根际土壤样品中筛选到一株溶 P 能力强的菌株 GJT-1,结合生理生化指标和16S rDNA 序列分析鉴定其为假单胞菌(Pseudomonas sp.).菌株 GJT-1 对磷酸三钙、磷酸铝、磷酸铁有一定的溶解能力,28℃培养到第 3 天对磷酸三钙液体培养基的溶 P 量可达 224.51 mg/L.该菌对开阳磷矿粉和宜昌磷矿粉的溶 P 量分别为 194.25 mg/L 和 120.59 mg/L.通过扫描电镜观察到接种活菌处理的磷矿粉表面凹凸且有黏性物质附着,表明菌株 GJT-1 可利用磷矿粉.  相似文献   

Crop residue contributions to phosphorus pools in agricultural soils: A review     

《Soil biology & biochemistry》2014

The phosphorus (P) content of crop residues and its availability to a subsequent crop can range from agronomically insignificant, to quantities in excess of crop P requirement. However, the contribution of crop residues to the P nutrition of subsequent crops has not been widely recognised, and simple predictive tools are lacking. By reviewing the published literature in which quantitative measurements of P transformations from plant residues applied to soil have been reported, we have evaluated the contribution of crop residue-derived P to the P nutrition of subsequent crops, assessed the key factors involved and summarised the knowledge as an empirical model. The contribution of crop residues to P availability is likely to be significant only under conditions where large amounts of crop residues of relatively high P concentration are applied to soil. Crop residues with low P concentration, such as cereal stubble (eg. due to re-translocation of a large proportion of stubble P into grain), will not make an agronomically significant contribution to soil P availability, but may reduce P availability due to assimilation in the microbial biomass. However, a productive green manure crop may release sufficient P to meet the requirements of a subsequent cash crop. The release of P from crop residues is significantly reduced in systems where the P-status of crops and soils is low, which reinforces the reliance on external P inputs for sustained crop productivity. The large variability in the potential contributions of plant residues to the P nutrition of subsequent crops suggests that there is a strong need to integrate model predictions of organically-cycled P with fertiliser management strategies.  相似文献   

Extraction of phosphate from some phosphatic compounds     

《Communications in Soil Science and Plant Analysis》2012,43(7):741-751

Abstract

Some of the common methods used for the evaluation of available phosphate in soils were studied with respect to their power of releasing phosphate present in certain phosphatic compounds and in the sorbed form. Considerable differences in the amounts extracted were observed, The anion resin extracted relatively larger quantities from Ca than from Al or Fe phosphate materials. EDTA extracted very small amounts from the Al‐phosphates in comparison with the amounts obtained from the Ca and the iron materials. Ammonium fluoride at low pH released considerable amounts of phosphate from all the phosphate materials including sorbed phosphate. The quantities of phosphate extracted by sodium bicarbonate and water were relatively low as well as those determined by isotopic exchange.  相似文献   

降低生长肥育猪饲料中磷酸氢钙水平的研究     

刘建高  张永刚  吴信  黄瑞林  李铁军  印遇龙 《家畜生态》2007,(1)

分30~60kg BW、60~100kg BW和30~100kg BW三个阶段研究了降低饲料中磷酸氢钙水平及降低磷酸氢钙的同时添加植酸酶对猪生长性能的影响。结果表明:磷酸氢钙添加水平在生长猪(30~60kg BW)饲料中由对照组的0.920%降低到0.552%、肥育猪(60~100kg BW)饲料中由对照组的0.760%降低到0.380%时都没有显著降低猪的生长性能(P>0.05),降低磷酸氢钙的同时添加植酸酶虽没有显著提高猪的生长速度(P>0.05),但能降低料肉比,其中在全阶段(30~100kg BW)的作用显著(P<0.05)。  相似文献   

不同基因型冬小麦叶片酸性磷酸酯酶活性的差异   总被引：3，自引：0，他引：3  

邱化蛟  贺明荣  常欣  许秀美  韩祥明  冷寿慈 《作物学报》2004,30(8):792-795

磷素利用效率较高的冬小麦品种临汾118叶片磷酸酯酶活性随生育期的变化在低磷条件下呈双峰曲线,和磷素利用效率低的冬小麦品种鲁麦13相比,其功能叶在灌浆期前酶活性较低,灌浆期后活性较高。鲁麦13酸性磷酸酯酶活性呈单峰曲线,其活性随磷肥的施用而提高,对肥料反应敏感。低磷条件下小麦第3叶磷酸酯酶活性和磷素利用效率显  相似文献