惠州市东湖花园植物资源调查与应用现状分析     

柴素芬  肖河章  杨馥霓 《热带作物学报》2009,29(9):14-18

广东省惠州市东湖花园的植物资源调查结果表明：该小区的植物种类可分为55科102种, 其中蕨类植物3科3种，裸子植物5科5种，被子植物47科94种，被子植物中双子叶植物36科61种，单子叶植物11科33种；分析其植物配置现状,并就其今后园林规划中植物的配置提出建议。  相似文献   

植物病原细菌hrp基因研究现状和展望     

李有志  唐纪良  马庆生 《广西农业生物科学》1997,(4)

从ｈｒｐ（过敏性反应和致病性）基因簇，ＤＮＡ序列的同源性，基因表达调控与ａｖｒ基因（无毒基因）的关系和基因的功能等几个方面较为详细地综述了植物病原细菌ｈｒｐ基因的研究现状，并分析了ｈｒｐ基因研究的未来趋势。  相似文献   

面向流程CIMS的设备集成维护与管理系统研究     

于德介  袁少辉刘坚 《湖南农业大学学报(自然科学版)》2004,31(2)

针对传统设备维护管理方式中出现的信息分散、流程分离和资源配置不合理等问题，以CIM哲理为指导设计了设备集成维护与管理系统。提出了设备集成维护与管理系统的网络体系结构，研究了该系统运行的工作流程，分析了系统信息集成、过程集成与优化和资源集成与优化等技术特性，并对实现该系统所需的建模、结构数据库与知识库构建、基于Web方式的数据库访问及CSCW等关键技术进行了探讨,该系统以分步实施的方式在中国石化巴陵分公司初步实现。  相似文献   

估测木薯茎叶生物量的一数学模型     

李晓明  杨重法  左应梅  张婷  詹建星  戴宇 《热带作物学报》2009,30(4):440-444

为构建木薯茎叶生物量的估测模型,调查了木薯上、中、下部的茎粗、株高、叶柄长等形态学指标与茎叶生物量的关系.结果表明,木薯茎叶生物量主要受下部茎粗和株高的综合影响,并且下部茎粗、株高与茎叶生物量的关系均为乘幂函数关系.通过模型拟合和择优得到木薯茎叶生物量的估测模型W=0.032 83d2.48 6h0.1824.经新的实测数据检验,理论值与实测值的相对误差率为4.46%,完全满足测量精度要求.  相似文献   

EF植物生长促进剂有效组份研究     

范泓  沈兆邦 《林产化学与工业》1990,10(3):155-161

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Sulfate and Calcium Movement in an Allophanic Soil—The Relevance of Ion‐Pair Adsorption in the Soil–Plant System     

《Communications in Soil Science and Plant Analysis》2012,43(17-18):2784-2799

Cooperative adsorption involving anions and cations, termed ion‐pair adsorption (IPA), is reported to increase the retention of some ions in certain soils. Sulfate and calcium can exhibit such interaction, and this affects their movement through the soil. Ion‐pair adsorption is shown here in miscible displacement experiments with a variable‐charge soil. The relevance of IPA under more realistic conditions is further investigated in a pot experiment. Rapeseed (Brassica napus) was grown at two different irrigation regimes and with two sulfur fertilizer sources. Calcium sulfate (CaSO₄·2H₂O) was used to induce IPA in contrast to potassium sulfate (K₂SO₄). The results suggest that IPA reduces sulfate and calcium leaching only in the short term. Continued irrigation dissipates the differences between the two fertilizer sources. Final soil ion concentrations and the plant uptake could not be related to IPA, evidencing the short‐term relevance of IPA. The influence of IPA on the bioavailability of calcium and sulfate to plants still demands further study.  相似文献   

Effect of Tillage and Plant Residue Management Practices on Shrinkage of a Vertisol     

A. M. Battikhi  A. A. Suleiman 《Journal of Agronomy and Crop Science》1999,182(4):285-290

A study was carried out to determine the effects of different tillage and plant residue management practices on different soil moisture and shrink-swell properties of a Vertisol (very fine, semctitic, thermic, chromic Haploxerert (with less than 1 % slope). The core samples were collected in July (after harvesting of lentil) and in November (after planting of wheat) 1993. The two tillage methods were moldboard (T1) and chisel (T2). The two plant residue incorporation dates were in August (R1) and in October (R2). Results indicated that T2 tends to give higher water holding capacity and available moisture than T1. Immediate incorporation of plant residue (R1) tends to increase the bulk density and to decrease soil specific volume and void ratio when compared to late incorporation treatment (R2). In general, the two tillage treatments tend to decrease moisture availability, shrinkage characteristics, soil specific volume, and void ratio. They also tend to increase the soil shrinkage (subsidence and cracks volume) and bulk density. Chisel plough is recommended in Vertisols, if it is to be used before the rainfall.  相似文献   

Effect of Tillage System on Soil Strength and Bulk Density of Vertisols     

A. M. Battikhi  A. A. Suleiman 《Journal of Agronomy and Crop Science》1999,183(2):81-89

Improving the soil environment for seedling emergence and plant growth is possible using a good tillage system. From March 1993 until June 1994, the effect of tillage system and plant residue incorporation practices on the bulk density and the soil strength of the surface layer of a vertisol (very fine, smectitic, thermic, chromic Haploxerert), on a less than 1 % slope, was investigated. The two tillage methods were moldboard (T1) and chisel (T2). The two plant residue incorporation dates were in August (R1) and in October (R2). Results indicated that R1 gave significantly higher bulk density than R2, while the different tillage treatments had no significant effect. Soil strength was significantly lower under T1 and R2 than under the other treatments.  相似文献   

海南居住区植物的种植设计     

徐建成 潘鄱唐树梅  李福龙杨安富 《热带作物学报》2008,28(2):34-38

居住区植物的种植设计是园林造景的重要景观元素设计途径之一。本文阐述了植物景观种植设计原理，探讨了海南居住区植物景观种植设计特点、种植模式的设计方法和思路。  相似文献   

浅谈园林绿地景石设计     

赵亮 《绿色科技》2013,(7):101-102

鉴于目前普遍的园林景观建设,针对绿地景石布置,从选材、设置理念到布置方式逐一进行了探讨,为绿地景石的布置设计提供参考。  相似文献