黄土高原重点县综合治理与发展规划中的地域分异研究

本文阐明了黄土高原县域规划中进行地域分异研究的必要性及其重要意义,并对县域内地域分异规律的特殊表现作了比较深入的探讨。     

Application of stable isotope techniques to the study of soil salinization

In this paper,we reviewed the progress in the application of stable isotope techniques to the study of soil salinization.As a powerful technique,stable isotopes have been widely used in the studies of soil water evaporation,the dynamics of soil salinization and salt-tolerant plant breeding.The impact of single environmental factors on plant isotope composition has been the focus of previous studies.However,the impact of multiple environmental factors on plant isotope composition remains unclear and needs to be carefully studied.In order to gain insights into soil salinization and amelioration,especially soil salinization in arid and semiarid areas,it is essential to employ stable isotope techniques and combine them with other methods,such as located field observation and remote sensing technology.     

盐渍化土壤渗透势的电导测定及其应用

本文介绍了用电导法测定盐渍土壤渗透势的方法，并将此法用于测定河西盐渍化土壤和碱茅（Ｐ．ｔｅｎｕｉｆｌｏｒａ）种子萌发期半致死渗透势。结果表明：河西盐渍化土壤浸提液的渗透势（ＯＰ，ＭＰａ）与电导率（ＥＣ，ｄｓｍ－１）呈指数关系，ＯＰ＝－０．０２５ＥＣ１．１９。研究区各类草地渗透势的变化特点是春、秋两季下降，夏季上升。２年生碱茅草地和撩荒地土壤０～１０ｃｍ层渗透势明显高于１０ｍ以下各层，其平均值分别是：－０．３４，－０．３１ＭＰａ；３年生碱茅草地渗透势升高，１０ｃｍ土层平均值为－０．０７ＭＰａ。碱茅种子萌发期的半致死渗透势为－０．９１ＭＰａ。     

荒漠植物蒸腾速率的变化与组织含水量的关系

荒漠植物在长期适应环境过程中表现出相应的水分生理适应性。本文在塔克拉玛干沙漠腹地通过对两年不同时段不同植物的蒸腾速率和植物组织含水量的测定结果进行统计分析 ,结果表明 ,蒸腾速率的大小与植物组织含水量的多少无关     

高山草地植物种群生态适应对策系列研究 Ⅱ 天祝高山草地植物种群生态适应对策表征

采用野外实地形态观察、人工气候箱内不同光、温处理的方法，对甘肃天祝高山草地４个建群种的微观形态、超微结构进行了观察，并对各种形态联系生态适应对策进行了内、外部形态表征。结果表明，环境因子不同量的干扰是形成生态适应对策表征的外动力。     

Gorenstein弱内射模

研究一种新的模:Gorenstein弱内射模,它是介于内射模与Gorenstein内射模之间的一种模.讨论了内射模与Gorenstein弱内射模之间的关系,证明了Gorenstein弱内射预包络的存在性.     

磁场对低温保存鸡精液品质的影响(英文)

[Objective] The study aimed to explore the effects of magnetic treatment on the quality of chicken semen stored at low temperature. [Method] 5 ml fresh chicken semen was divided into five groups equally, each of which was diluted at the volume ratio 1∶4. With the group without magnetic treatment as the control, the other four groups were magnetized for 6, 12, 24 and 48 min in the self-made magnetizer, respectively. Subsequently, all the five groups were stored at 2-4 ℃, and the sperm motility, survival time, survival index and deformity rate were observed regularly. [Result] Comparing with the control group, the magnetic groups showed higher sperm motilities and effective survival indices as well as lower deformity rates. The effective survival index of the group magnetized for 24 min was the highest and increased by 7.75% in contrast to the control. [Conclusion] Magnetic treatment can effectively enhance the quality of chicken semen stored at low temperature.     

天祝高山草地植物种群生态适应对策组成

对甘肃天祝高山牧地和休闲牧地中３２个植物种群进行了６种生境、２５个处理、全年４次测定、２次重复的生态适应性野外天然和水、肥干扰草地样方中的生物量调查。数学模型分析草地参试植物的生态适应评判值和种群与环境相互作用系数，划分出趋活（占总调查的３１％，下同）、趋中（４４％）和趋惰（２５％）３种生态适应性，它们构成了高山草地植物种群的生态适应对策。     

Effects of deficit irrigation on daily and seasonal variations of trunk sap flow and its growth in Calligonum arborescens

Water deficit in arid and semiarid regions affects whole-plant sap flow and leaf-level water relations. The objectives of this study were to clarify how sap flow of Calligonum arborescens responds to different drought stress conditions and to understand its acclimation mechanism to drought environments. A field experiment was conducted for C. arborescens during the growing season to evaluate the effects of deficit irrigation on the daily and seasonal variations of trunk sap flow in the shelterbelt along the Tarim Desert Highway, Xinjiang, China. Three different water regimes (2,380, 1,960 and 1,225 m3 /hm2 ) were applied at different stages of plant growth. From 1 May to 30 October 2007, a heat-balance stem flow gauge was used to monitor the sap flow dynamics of C. arborescens under different water regimes. Atmospheric evaporation demand and soil moisture conditions for differentially irrigated C. arborescens were also monitored. The result showed that sap flow exhibited a clear diurnal pattern regardless of treatments; the diurnal patterns of sap flow and vapour pressure deficit were very similar under different water regimes and growing seasons, while the slope of the linear regression of this correlation confirmed an increasing water regime. The sap flow decreased under reduced water regimes and there was nocturnal sap flow regardless of water regimes, which was mainly contributed to nocturnal transpiration and water recharge. The sap flow peaked before midnight and dropped afterwards with obviously higher values in summer than in other seasons. It is speculated that the water consumption of C. arborescens during the day can be supplemented through the sap flow at night, which increased with increasing irrigation amount. Net radiation was the most significant correlated factor that influenced sap flow velocity and transpiration under different water regimes (R2 >0.719). Compared with the commonly practiced water regime, the growth of C. arborescens was significantly slower in the stress deficit irrigation, but not significantly different from that in the moderate deficit irrigation. The moderate deficit irrigation would not affect the stability of the shelterbelt and was a more efficient use of water resources compared with the current watering amount.     

“瑞奇”高效有机肥对当归产量及构成因素的研究

研究了施用新型高效有机肥料对当归根的形态﹑根重﹑产量以及麻口病害发生率的影响。结果表明:施用高效有机肥处理的鲜、干芦头径分别为3.67cm和2.57cm,较施用化肥处理增大10.54%和7.08%,鲜、干主身径分别提高7.69%、6.60%;单根干重为38.82,比化肥处理增大15.02%,平均“干/鲜”比增加了40%;施用高效有机肥处理的成苗率提高了4.11%,干归公顷产量也高于化肥处理,达到2371.84kg/hm2;施用高效有机肥处理的麻口病发病率为6.95%,低于施用化肥处理17.04%,有利于当归的高产、优质栽培。