We constructed fences using 2 x 2 x 2 factorial design to examine the effect patterns of food availability , predation and interspecific competition on population dynamics and spatial behavior of reed voles , microtusfortis . we expected to test two hypothesises : ( 1 ) availability of high quality food , predation and interspecific competition have independent and addictive effects on population system dynamics for small mammalia herbivore ; ( 2 ) availabiliry of high quality food could reduce home range and aggressive behavior level between individuals of microtine , predation and interspecific competition have independent effects on spatial behavior of microtine 以2 2 2析因实验设计，在野外围栏条件下，探讨食物可利用性、捕食及种间竞争对沼泽田鼠( microtusfortis )种群动态及空间行为的作用，旨在检验下述特定假设： ( 1 )高质量的食物可利用性、捕食及种间竞争对植食性小哺乳动物种群系统动态具有独立的和累加的效应； ( 2 )高质量的食物可利用性可降低田鼠个体间的攻击行为水平，并导致其巢区减小；捕食与种间竞争对田鼠的空间行为亦有独立的作用。
To let more domestic relevant researchers understand the applicable techniques of stable isotopes , this article not only introduces the principles of isotopes measurements by gas isotope ratio mass spectrometer , but also integrates the experiences of hydrogen , oxygen , carbon , nitrogen , and sulfur isotopes in agriculture and environmental applications that were described in papers 为让国内更多相关研究人员了解稳定同位素技术的可利用性，本文描述气相同位素比值质谱仪之分析原理，及整理氢、氧、碳、氮和硫等同位素在农业及相关生态环境研究上应用的文献。
The principle and technique of ultrasonic imagery are expounded herein and it is proved by practice that the exploration to determine the height of leaking crevice belt in wrecked - rock over coal seam by the technique of ultrasonic imagery in borehole can overcome the defect of routine methodes . with the result that the exploring precision is improved and the data become useful 本文阐述了超声成像的原理和方法，实际应用证明，利用超声波扫描成像技术对覆岩破坏钻孔进行探测，可克服常规方法的不足，从而提高了勘探精度与资料的可利用性。
In this study a microbial system for biphenyl biodegradation is set up in order to investigate the effects of surfactants on biodegradation of hydrophobic organic compounds . four strains which can grow on biphenyl as the sole carbon and energy sources are selected out , in which alcaligenes eutrophus dj1 and pseudomonas sms02 are chosen as degradation strains . after studing the bioavailability of three nonionic surfactants ( op - 10 , tween - 80 , and triton x - 100 ) , they are added into the biodegradation system of biphenyl 为了考察表面活性剂对疏水性有机污染物生物降解的影响，本论文选择联苯作为模拟研究体系，筛选、驯化得到四株可利用联苯作为碳源生长的菌株；考察了联苯降解菌株对三种非离子表面活性剂op - 10 、 tween - 80 、 tritonx - 100的生物可利用性；用高效液相色谱法测定了非离子表面活性剂对联苯的增溶曲线；较系统地研究了加入非离子表面活性剂对联苯生物降解速率的影响。
Specification introduce software and hardware are design and characteristic about data communication of integrate digital i & c system in nuclear power plant , and we was analyze configuration of data communication software and hardware . the design of data communication software and hardware is available and high reliability , the data communication is sufficient reliability for nuclear power plant required 介绍了核电厂全数字化仪控系统数据通信软硬件设计的主要特点,并通过对数据通信软硬件结构的详细分析,指出了核电厂统数据通信软硬件设计高度的可靠性和可利用性等优点,满足了核电厂对数据通信高度可靠的要求。
The causes of devolution , desertation , salinization and solonization were analysed in two aspects : it is apparently due to overpopulation , overstocking , unreasonably using , lacking of new technique , frequent occurrence of nature disaster , small area and low output of artificial pasture and semi - artificial pasture , but the more deeply reason was that the function of grassland was not completely understood only emphasizing the economic efficiency and regrowthful resource in grassland while the ecological efficiency and its potential use were neglected 本文主要从两方面对草原三化进行了分析，首先从表面上看有以下几方面原因，人口多、牲畜数量多、草原利用不合理、新技术推广差、草原自然灾害频繁、人工半人工草地少产量低。其次又挖掘了草原退化的深层原因，第一对草原资源的功能和作用的认识具有片面性，只重视草原的经济效益，却忽略了它的生态效益；只重视草原资源的再生性，却忽略了它的适宜可利用性。
