《国有土地上房屋征收与补偿条例》解读：规范拆迁强化补偿是亮点

为社会各界广泛关注的《国有土地上房屋征收与补偿条例》（以下简称条例）顺利通过。中国人民大学副校长、中国法学会民法学研究会会长王利明表示,条例事关国计民生和经济社会发展全局,它的颁布和施行,将有助于规范拆迁活动、保障被拆迁人的合法权益,促进经济社会和谐发展。     

杭州市轨道交通地上地下空间综合开发利用的成效、问题与对策

随着近年来经济的快速发展,杭州城市化进程不断加快,城市人口急剧增加,城市交通拥堵,用地紧张.地上空间的高度密集和土地资源的紧缺,促使杭州市深入探索地上地下空间综合开发利用.2018年3月,原国土资源部批复同意《浙江省杭州市轨道交通地上地下综合开发利用创新工作方案》.杭州市围绕"一个目标",即以全面保障2022年杭州亚运...     

地源热泵技术及其发展

地源热泵主要由四个部件组成：即压缩机，冷凝器，膨胀器和调节阀，而地热泵系统的设计主要包括地上和地下系统的设计，地下系统有开放式，封闭式和混合式三种，可根据实际情况来选择；地上系统的设计主要有风机盘管,地板式采暖系统，混合散热系统和中央空调系统的设计。     

两国相争、刀光剑影——介绍一种在沙地上进行的地图游戏 刘垂光

老家浙东H县城是座依山旁水的古镇，镇南沙滩绵延，滩上小草簇簇。我就读的小学就离江边不远，每天放学后准要约上几个同路的同学去江边尽情地游玩一番，然后才踏上归途。     

放牧强度对高寒杂草类草甸群落结构及生物量的影响

分析了不同放牧强度下青藏高原高寒杂草类草甸植物群落种类组成与结构、物种多样性、生物量的变化状况.结果表明:重牧(HG)条件下草层垂直分化不明显,仅1层结构,而轻牧(LG)和中牧(MG)与对照(CK)条件下禾草和矮嵩草能得到较好的生长,草场垂直结构分异为2层;不同放牧强度下莎草科、禾本科和杂类草的重要值变化趋势不尽相同,HG会导致种类组成的下降,CK和适度放牧下种类组成仍保持较高的水平;尽管短期过度放牧抑制了优良牧草的生长和发育,种类组成降低,但因放牧时间短,组成群落的主要优势种具有较强的耐牧性以及植物生态-生物学特性和遗传性,其群落结构是稳定的;植物地上生物量表现出MG >LG >CK >HG,即适度放牧可提高地上生物量;地下生物量在CK条件下最高,其次为MG、HG和LG,CK、MG与LG、HG有显著性差异.植物根冠比从大到小依次为HG、CK、MG、LG,HG的根冠比显著大于LG.     

Impacts of Typhoons Tianying and Dawei on seagrass distribution in Xincun Bay, Hainan Province, China

More than 50% of the typhoons landing in China have landed on the southeast coast, where they have caused great pressure on the coastal environment. Seagrass, one of the most important constituents of coastal ecosystems, is also greatly affected by typhoons. In order to clarify how seagrass distribution variation is affected by typhoons in coastal areas in southeast China, data of Typhoons Dawei and Tianying (category 4 and category 2 respectively, which just ran through the southern part of Hainan province) have been studied. In situ observation and satellite remote sensing data (CBERS-China Brazil Earth Resources Satellite) in 2004 and 2006 were used to retrieve seagrass distribution in Xincun Bay, Hainan province. In situ observations showed that leaf length, stem biomass and above ground biomass on average showed evidence of reduction after Typhoons Tianying and Dawei. However, seagrass density showed no evidence of reduction after typhoon Tianying and Dawei passed by and increased rapidly in January 2006. From results of satellite remote sensing data, seagrass distribution can be detected with high accuracy, and the area of seagrass distribution on the south coast of Xincun Bay in 2006 after the typhoon passed by was smaller than that in 2004 in region A and B. However, in region C, area of seagrass coverage under 20% increased. These results demonstrated that typhoons Tianying and Dawei damaged seagrass bed and helped seagrass to get rid of aged and dead leaves, and this correspondingly facilitated seagrass growth.     

Effects of grazing exclusion on plant productivity and soil carbon,nitrogen storage in alpine meadows in northern Tibet,China

Grazing exclusion is widely adopted in restoring degraded alpine grasslands on the Qinghai-Tibetan Plateau. However, its effectiveness remains poorly understood. In this study, we investigated the effects of grazing exclusion on plant productivity, species diversity and soil organic carbon （SOC） and soil total nitrogen （STN） storage along a transect spanning from east to west of alpine meadows in northern Tibet, China. After six years of grazing exclusion, plant cover, aboveground biomass （AGB）, belowground biomass （BGB）, SOC and STN were increased, but species diversity indices declined. The enhancement of AGB and SOC caused by grazing exclusion was correlated positively with mean annual precipitation （MAP）. Grazing exclusion led to remarkable biomass increase of sedge species, especially Kobresia pygmaea, whereas decrease of biomass in forbs and no obvious change in grass, leguminous and noxious species. Root biomass was concentrated in the near surface layer （10 cm） after grazing exclusion. The effects of grazing exclusion on SOC storage were confined to shallow soil layer in sites with lower MAP. It is indicated that grazing exclusion is an effective measure to increase forage production and enhance soil carbon sequestration in the studied region. The effect is more efficient in sites with higher precipitation. However, the results revealed a tradeoff between vegetation restoration and ecological biodiversity. Therefore, carbon pools recover more quickly than plant biodiversity in the alpine meadows. We suggest that grazing exclusion should be combined with other measures to reconcile grassland restoration and biodiversitv conservation.     

一种基于无人机多光谱数据的生物量估算方法研究

在多光谱数据中,两数据点间连线的斜率能够大致反映数值的变化规律。为探究斜率能否作为参数估算地上生物量（above ground biomass, AGB）,且保持与红边的高线性相关性。本研究使用两个无人机多光谱数据集,利用简单线性回归（simple linear regression,SLR）估算AGB,用决定系数（R2）与均方根误差（root mean squares error,RMSE）来评估线性相关性进而评定其作为估算AGB的能力。结果表明：直接使用斜率进行线性回归时,斜率在不同波长表现不同,在680 nm处的斜率线性相关性最高。在构建的植被指数（vegetation indexes,VIs）中,由红边处斜率参与构建的植被指数同样有着高的线性相关性,并且表现出了比反射率计算的植被指数有更高的线性相关性。     

红土地上清风吹——江西省国土资源厅开展“两整治一改革”专项行动纪实

自全国国土资源系统“两整治一改革”专项行动开展以来,经过广大干部职工的扎实工作,江西省国土资源系统在依法行政、节约集约利用国土资源、     

瓷韵悠悠古龙窑

武夷山之余脉——洞宫山脉,孕育了龙泉大地上的江浙第一高峰——凤阳山。而矗立在其西南侧,且与之遥遥相对的琉华山,却又是龙泉境内的另一座名山。全国重点文物保护单位——龙泉大窑遗址就位于其山脚下的琉田村,即现在的小梅镇大窑村。气势磅礴的琉华山,由于其树木苍郁,溪水清澈,土壤优质,为青瓷生产提供了得天独厚的自