中国县域粮食产量与农业劳动力变化耦合关系研究（英文）

In this paper we establish a model that expresses the coupled relationship between grain yield and agricultural labor changes in China, and present a preliminary discussion of the coupled processes involved in changes in these factors at the county level. Thus, we develop two coefficients on the basis of county-level statistical data for grain yield and agricultural labor for the years 1991, 2000, and 2010, namely, the grain-labor elasticity coefficient(GLEC) and the agricultural labor-transfer effect coefficient(ALTEC). The results of this study show that during the transformation process of agricultural development in China, different kinds of coupled relationships between grain yield and agricultural labor changes co-existed at the same time. For example, between 1991 and 2010, counties characterized by three different coupled modes(i.e., increasing grain yield and decreasing agricultural labor, increasing grain yield and agricultural labor, and decreasing grain yield and agricultural labor) account for 48.85%, 29.11%, and 19.74% of the total across the study area, respectively. Interestingly, a coupled relationship between increasing grain yield and decreasing agricultural labor is mainly concentrated in the traditional farming areas of China, while a coupled relationship between increasing grain yield and agricultural labor is primarily concentrated in pastoral areas and agro-pastoral ecotones in underdeveloped western China. At the same time, a coupled relationship between decreasing grain yield and agricultural labor is concentrated in areas that have experienced a rapid development transition in agriculture, especially the developed southeastern coast of China. The results of this study also show that between 1991 and 2010, 1961 counties experienced a decline in the proportion of agricultural labor; of these, 1452 are also characterized by increasing grain yield, 72.38% of the total. This coupled relationship between grain yield and changes in the proportion of agricultural labor shows a stepped fluctuation and has continually strengthened over time. Data show that mean values for the GLEC and ALTEC increased from –0.25 and –2.93 between 1991 and 2000 to –0.16and –1.78 between 2000 and 2010, respectively. These changes in GLEC and ALTEC illustrate that the influence of agricultural labor changes on increasing grain yields has gradually diminished. Finally, the results of this study reveal that the ‘Hu Huanyong Line' is a significant boundary sub-dividing this coupled relationship between grain yield and changes in agricultural labor.     

首届全球农村发展与土地能力建设国际研讨会会议综述（英文）

正Background of the conference Urbanization is one of the major land use and land cover changes sweeping the globe.Rural decline has inevitably accompanied with the increasing global levels of urban development.Emerging rural issues have swept both developing and developed countries and hindered rural     

内蒙古突泉县莲花山银铜矿床成矿地质背景探讨

文章通过对莲花山银铜矿床与成矿关系较密切的次火山岩的岩石化学、微量元素、稀土元素和同位素分析,对该矿床的成矿地质背景进行了探讨;认为莲花山银铜矿床是在太平洋板块向亚洲大陆板块俯冲下产生的弧后引张区,由来源于上地幔或下地壳的深源钙碱性岩浆多次上侵,在相对封闭的还原环境下形成的中高温热液矿床.     

高分辨率航空影像中斑马线的识别与重建

提出了一种利用高分辨率航空影像自动识别与重建斑马线的方法。文中利用基于灰度共生矩阵（cray level co-occurrence matrix,GLCM）和二维Gabor滤波器特征的JointBoost分类器来提取斑马线,并依据斑马线在空间几何上的重复性规则对斑马线建立参数模型。最后结合一些具有代表性的实验数据（如阴影、遮挡和模糊等）来验证本文所提出的方法在斑马线的识别与重建中的有效性。     

延安市能见度与相对湿度和PM_(2.5)及PM_(10)的关系

为分析延安市能见度与相对湿度、气溶胶质量浓度的关系,利用2016年延安大气成分站PM_(2.5)、PM_(10)和国家基本气象站相对湿度、能见度观测资料,对能见度与相对湿度、PM_(2.5)和PM_(10)的关系进行分析。结果表明:全年能见度与相对湿度的线性相关系数最高,与PM_(10)次之;随相对湿度的增大,能见度明显降低。相对湿度<50%时,能见度与PM_(2.5)的非线性相关性高于与PM_(10)的相关性;相对湿度>50%时,能见度与PM_(10)的非线性相关性则较PM_(2.5)好。相较于线性拟合方法,能见度与相对湿度的非线性拟合公式能更好地表现二者的关系。利用相对湿度、PM_(2.5)和PM_(10)观测数据对能见度做多元非线性拟合,检验结果表明,计算得出的拟合公式能较好地模拟延安市能见度的变化规律。     

长江沿线样带土地利用变化时空模拟及其对策

短时期(几年或几十年)的土地利用变化,主要受社会经济因素的驱动和自然因素的约束。各类土地利用变化基本上都能从与人类生产活动密切相关的耕地和城乡建设用地的变化上得到反映。利用修订后的GTR模型,对长江沿线样带未来30年的土地利用变化进行了模拟。研究发现,东部地区的耕地面积将进一步减少,而全区的耕地和建设用地面积将增加。根据研究区未来土地利用变化的时空特点,提出了相关应对策略,以利于区域土地持续利用的实现     

准噶尔盆地热历史

准噶尔盆地从石炭一二叠纪的“热盆”（古地温梯度0．05-0．07℃／m）演变成新生代典型的“冷盆”（地温梯度0.02－0.023℃／m），使盆地两套主要烃源岩：二叠系和侏罗系烃源岩热演化程度（成熟度）具有明显的差异。二叠系径源岩成熟度普遍很高，大部分达到过成熟阶段；而侏罗系烃源岩成熟度则很低，即使埋深超过5000m，实测镜质组反射率R°％仅为0．5－0．6，相当于生油初期（低成熟）阶段。通过应用Waples模型和Sweeney－Burnham模型两种方法对盆地13口深井进行古地温梯度拟合计算表明：对于热演化过程主要发生在白垩纪之前，高地温梯度背景下的8口深井，烃源岩热演化受压力的影响小，成熟度相对较高；而对于热演化过程主要发生在白垩纪之后、低地温梯度背景下的5口井，烃源岩热演化受压力的影响较大，成熟度异常偏低，实测镜质组反射率低于用Waples模型和Sweeney－Burnham模型计算的镜质组反射率。     

应重视选用芳烃演化参数评价高演化碳酸盐岩

现被广泛应用的测定高演化碳酸盐岩成熟度指标的多项有机岩石学评价方法，各有其不同的局限性，应用效果并不理想。研究发现，可利用芳烃演化新参数来代替其它失效的分子参数来评价碳酸盐岩有机质。芳烃因其结构、组成的特殊性和稳定性，在高演化阶段与油气生成及煤源岩成熟度有着良好的相关性，具有成为高演化碳酸盐岩成熟度指标的基础。从生产实践的角度看，芳烃演化参数有特殊适用性及选取的可行性。