宕昌县滩子牧场草地类型及生产力分析

于2008年7月,对甘肃省宕昌县滩子牧场草地生产力进行调查,利用GIS技术绘制草地类型图,并对其家畜承载力进行评价.经调查,滩子牧场总面积2 449 hm2.草地类型属山地草甸类,可划分为3个草地组8种草地型.其中,杂类草组包括防风(Saposhnilovia divaricata)+草玉梅(Anemone rivil...     

草畜平衡管理系列研究（1） ——现行草畜平衡管理制度刍议

对现行草畜平衡的监测和管理制度进行了分析,指出其在预测的时效性、与现行生产体系的适合性以及针对性等方面存在的不足与缺憾。评价了当前草畜平衡管理中的一些误区。基于基层工作的实践经验和资料数据,提出了改进草畜平衡监测和管理的一些建议。     

河南省陆地植被净第一性生产力估算及其时空分布

基于地理信息系统和卫星遥感技术,利用地面气象数据和MODIS数据,同时考虑河南省自身实际地理和植被覆盖情况,在对最大光利用率和水分胁迫系数的获取进行改进的基础上,利用CASA模型对河南省植被净第一性生产力（NPP）进行了估算,并分析了其时空分布。结果表明,2008年河南省NPP生产量为34.87 Mt C,NPP空间分布和植被类型有密切关系,森林植被最大,然后依次是灌丛、草地、农田等。12、1和2月NPP最小,植物基本停止生长,植被的NPP只占全年的1.38％;5、7和8月的NPP最大,占全年总量的56.84％。与Miami、Montreal、Chinkugo模型相比,本研究结果和Miami模型结果最为接近,植被类型NPP均值排序和Chinkugo模型相似;与实测数据对比结果显示,模拟值接近于实测值,说明模型适用于河南省NPP的模拟。     

基于层次聚类的河北省苹果生产能力的实证研究

作为全国苹果主产省,河北省共有11个地区生产苹果,但这11个地区的生产能力参差不齐.现采用层次聚类法,依据生产能力将这些地区分为3类.根据3类地区生产能力的特点,提出河北省苹果产业发展的政策启示:加大科研和技术推广力度;建立和完善加工用果品原料基地;大力推进苹果协会和果农专合组织的建设;建立和完善果品销售市场体系;加强苹果品牌建设.     

Phytochemical and antioxidant properties of selected fig (Ficus carica L.) accessions from the eastern Mediterranean region of Turkey

Fig has been a typical fruit component of the health-promoting Mediterranean diet for a very long time. Phytochemical characters and antioxidant capacity of green-, yellow-, brown-, purple-, and black-fruited fig (Ficus carica L.) accessions were investigated. In this study, total phenolics (TP), total anthocyanins (TA), fructose (FRUC), glucose (GLUC), sucrose (SUC), and variables (such as L*, a*, C*, and hue°) describing fruit skin colors were examined. Also, the antioxidant capacity (TAC) of fig fruits was determined by the ferric reducing antioxidant power (FRAP) assay. Antioxidant capacity was significantly correlated with the polyphenol and anthocyanin (r = 0.74 and 0.63, respectively) contents of fruits. Black fig accessions had the highest TAC (range of 7.9–16.1, mean 12.4 Fe²⁺ mmol/kg FW), TA (range of 32.3–356.0, mean 128.4 μg cy-3-rutinoside/g FW), and TP content (range of 69.1–220.0, mean 118.9 mg GAE/100 g FW). These black-fruited accessions had 2-fold greater TAC, 15-fold greater TA, and 2.5-fold greater TP than green and yellow fig accessions. However, the FRUC, GLUC, and SUC content of brown and purple fig accessions were higher than those of other color groups. The predominant sugars present were fructose (∼56%) and glucose (∼43%), as determined by HPLC.     

Criterion for estimating humidity control capacity of materials in a room

As a measure of estimating humidity control capacity of materials in an airtight room under sinusoidal temperature variation, we used the Cb value, which is the ratio of the range of variation in relative humidity in a steel box lined with the material of interest to the range in an empty steel box. In order to clarify the factors that affect the Cb value, we focused on both the temperature variation rate and the area that is lined in the box. It was found that changing the rate of temperature variation over one period strongly affected the Cb value, although the amplitude of temperature variation did not. We further noticed that the difference between the time when peak temperature was reached and the time when peak absolute humidity was reached (peak time difference), was found to be useful for estimating the humidity control capacity of materials. Knowing the difference between the phase when peak temperature was reached and the phase when peak absolute humidity was reached (phase angle difference) was also useful. Because the Cb value was affected by both the variation period and the lined area in the box, we can draw a contour diagram of the period and the lined area for materials to give an overview of the humidity control capacity of a material. The materials of primary interest in this study were Japanese cedar and porous ceramics.     

混合型复合地基与摩擦桩在基础工程应用中比较分析

介绍混合型复合地基和摩擦桩的承载力特点，并通过工程案例的分析，在两种基础的承载力、造价、材料等方面进行比较，表明混合型复合地基相对摩擦桩来说更适合此工程。针对目前混合型复合地基的理论研究和试验研究的进展，提出今后需要解决的问题。     

林业企业电网实现最佳无功补偿的技术方法

本文对林业企业电网实现最佳无功补偿问题进行了探讨,并提出了确定电网实现最佳无功补偿容量的计算公式及具体方法,为提高电网功率,缓解林区供电紧张的问题提供了依据。     

乐昌含笑人工林的土壤肥力和涵养水源功能研究

通过对乐昌含笑和杉木人工林生物量和土壤肥力的调查,进行乐昌含笑人工林培肥土壤和涵养水源功能的研究,结果表明:营造乐昌含笑人工林后林地土壤水稳性团聚体含量增加,团聚体的稳定性增强,容重降低,总孔隙度增加,林地土壤结构、孔隙和养分状况得到不同程度的改善,乐昌含笑人工林具有比杉木林更好的培肥土壤功能;乐昌含笑叶的最大持水率明显高于杉木叶,其林分地上部分最大持水量是杉木林的1.14倍,同时由于乐昌含笑林土壤结构及孔隙状况的改善,林地蓄水能力增强,使得乐昌含笑人工林表现出比杉木林更好的水源涵养功能。     

香椿组织培养与快速繁殖的研究

香椿试管苗在不同培养条件下增殖速度明显不同.太行山香椿试管苗的最佳增殖条件为改良MS十SBA1.0十GA_32.0+IAA0.0;燕山香椿试管苗则为WPM+6BA1.0+GA_32.0+IAA0.0。试管苗的生根能力在IBA0.2～1.0的范围内逐渐提高.增殖倍数不同试管苗其K的摄入量、碳水化合物含量以及POD和EST同工酶图谱亦有明显差别。