Microstructure and Anatomical Characteristics of Daemonorops margaritae

Daemonorops margaritae is among the most important commercial rattan in South China. Its microstructure and basic anatomical characteristics as well as variation were investigated. Results show that: 1)The variation along the height is small, while the variation along the radial direction is significant; 2) The fibre length, fibre ratio and distribution density of the vascular bundles in the cross section decrease from cortex to core, while the fibre width, vessel element length and width, parenchyma ratio,...     

热带四种按树人工林的土壤指标对氮肥反应的评价

较低氮利用性经常会导致桉树人工林的减产.为检验氮矿化的土壤指标的利用并预测桉树对添加氮肥的响应,研究四种桉树人工林(印度海岸低洼地2种细叶桉人工林和和喀拉拉邦高地的2种巨桉人工林)对添加氮肥和相关季节性氮矿化以及其他氮利用率指标的响应,测定几种生化指标对氮肥的响应,包括全氮,土壤C:N比和在厌氧、有氧孵化过程中释放的氮.结果表明,在4块实验地里,增加氮肥可以相应的提高生产率7%至70%;在有氧孵化过程中,释放的氮与氮肥间有最显著相关性(R2=0.92,p<0.01).与有氧孵化过程中释放的氮相比,季节性土壤氮矿化作用是一个较差的肥料响应的指标.虽然有的指标有很好的应用价值,但在广泛应用之前还需验证测试.     

A Rice CaMBP Gene is Induced in Organ-Specific Manner by Both Chilling and Heat-Shock Treatments

A rice CaMBP gene, OsCaMBP (AB363406), was isolated from a chilling treated rice using the fluorescent differential display (FDD) screening method. Its cDNA sequence (2094 bp) contains an opening reading frame (ORF) encoding a 569 amino acids protein (63.2 kD). OsCaMBP has the typical structural features of the CaMBP family, including the conserved IQ calmodulin-binding motif at the N-terminus. Homology analysis revealed 38.25%–47.28% identities of OsCaMBP with other CaMBPs in plants. RT-PCR analysis showed...     

八步区无公害蔬菜生产现状和发展对策

发展无公害蔬菜是提高蔬菜产品品质,增强其在国际市场上竞争力的要求,也是保障人们身体健康的需要。八步区作为全国首批无公害蔬菜生产基地示范县(区)之一,蔬菜生产起步早,是农民致富的主要途径。但随着蔬菜生产的发展,同时也出现了一系列问题。本文针对八步区蔬菜生产现状,提出发展无公害蔬菜生产的相应措施,即从田头开始,规范各项技术措施和提供保障措施,做好蔬菜生产的全程质量监控。     

An Empirical Estimation of Effects of Priority Forestry Programs on Farmers’ Incomes in China

China has launched six Priority Forestry Programs (PFPs) since 1998, i.e. the Natural Forest Protection Program, the Cropland Conversion to Forest and Grassland Program, Sandification Control Program for the Vicinity of Beijing & Tianjin , Wildlife Conservation and Nature Reserve Development Program, Forest Industrial Base Development Program and Shelterbelt Development Programs for regions such as Three North and the Yangtze River Catchments. The Government of China has made different policies for these PF...     

Spatial Variability of Soil Saturated Hydraulic Conductivity in a Small Watershed of Loess Hilly Region,China

Saturated hydraulic conductivity (Ks) is an important soil hydraulic parameter for charactering the rate of water flow across the soils and is mainly related to its high spatial variability. In a small watershed with the area of 0.27 km2 in the Loess Plateau, Ks of 197 soil samples under different vegetations and landforms were measured. Ks had a moderate variability for total samples. The forestland had high Ks with low coefficient of variation (CV), but the grassland in the watershed bottom had low Ks wit...