小空地 大改变

户外体育游戏是孩子们非常喜欢的活动,为了在雨天也能保证幼儿的运动时间与运动量,我们设置了室内体育区域活动,让孩子们在有限的范围内促进各项动作的发展。但由于场地空间限制,我们尝试探索优化利用小面积的室内空间,发挥小空地的价值,做出大的改变,促进幼儿运动能力的发展。

Light for Earthquake Prediction:Shocks before the L'Aquila Earthquake of April 6,2009

The temporal-spatial distribution of mid-small earthquakes in Italy and its surroundings from January 1 to April 5,2009 shows that there were significant foreshocks before the moderate L'Aquila earthquake of April 6,2009.The enhancement of frequency and intensity of small earthquakes and their concentrating tendency to the future main shock have provided a comprehensive case for digging methods of earthquake forecasting with foreshocks.

Scale-Dependent Representations of Relief Based on Wavelet Analysis

Automatic generalization of geographic information is the core of multi_scale representation of spatial data,but the scale_dependent generalization methods are far from abundant because of its extreme complicacy.This paper puts forward a new consistency model about scale_dependent representations of relief based on wavelet analysis,and discusses the thresholds in the model so as to acquire the continual representations of relief with different details between scales.The model not only meets the need of automatic generalization but also is scale-dependent completely.Some practical examples are given.

Where Are Potential Regions for the Reallocation of Wheat in the Context of Chinese Land Fallow and Food Security Policies? Findings from Spatio-temporal Changes in Area and Production Between 1990 and 2014

One of the aims of the recently initiated land fallow policy is to encourage winter wheat abandonment in order to recover the groundwater environment of the North China Plain (NCP);although this also threatens a national secure supply of this crop,as the NCP is the major wheat producing area in China.It is therefore necessary to consider regional wheat reallocation in order to meet the twin challenges of production and water conservation.An evaluation of spatiotemporal changes in wheat area and production across China in recent years may shed light on the regions that have the potential for reallocation;such trends are analyzed in this study using agricultural statistical data.Three over-arching principles are proposed that reallocation must be naturally suitable,economically feasible,and socially acceptable,and together with the result of the spatiotemporal analysis,two continuous areas are recommended as potentially suitable for wheat reallocation-alongside the Huai River and the cold region of northeastern China.We also present strategies to improve wheat yields as well as policies for farmers,aiming to encourage the reallocation of wheat to the regions highlighted in this study.

Space- and ground-based CO_2 measurements： A review

The climate warming is mainly due to the increase in concentrations of anthropogenic greenhouse gases, of which CO_2 is the most important one responsible for radiative forcing of the climate. In order to reduce the great estimation uncertainty of atmospheric CO_2 concentrations, several CO_2-related satellites have been successfully launched and many future greenhouse gas monitoring missions are planned. In this paper, we review the development of CO_2 retrieval algorithms, spatial interpolation methods and ground observations. The main findings include: 1) current CO_2 retrieval algorithms only partially account for atmospheric scattering effects; 2) the accurate estimation of the vertical profile of greenhouse gas concentrations is a long-term challenge for remote sensing techniques; 3) ground-based observations are too sparse to accurately infer CO_2 concentrations on regional scales; and 4) accuracy is the primary challenge of satellite estimation of CO_2 concentrations. These findings, taken as a whole, point to the need to develop a high accuracy method for simulation of carbon sources and sinks on the basis of the fundamental theorem of Earth's surface modelling, which is able to efficiently fuse space- and ground-based measurements on the one hand and work with atmospheric transport models on the other hand.

Fine-scale spatial distribution of soil organic carbon and its fractions after afforestation with Pinus sylvestris and Salix psammophila in a semiarid desert of China

Afforestation is helpful to improve soil functions and increase soil organic carbon(SOC)sequestration in semiarid deserts.However,the fine-scale(around a single plant)spatial distribution of SOC and its liable organic carbon(LOC)fractions after afforestation in semiarid deserts are poorly understood.Pinus sylvestris and Salix psammophila afforested on shifting sandy land(Sland)were selected to quantify fine-scale(at 20,80,150 and 240 cm away from the trees)spatial distribution of SOC and its LOC fractions in the southeast edge of Mu Us Desert,China.The results showed that the afforested S.psammophila and P.sylvestris significantly increased SOC,total nitrogen,dissolved organic carbon,microbial biomass carbon and readily oxidized organic carbon(ROOC).At 20 cm distance,SOC storage of P.sylvestris was 27.21%higher than S.psammophila in 0-100 cm soil layers,and SOC storage of S.psammophila at 80 and 150 cm distances was 5.50%and 5.66%higher than P.sylvestris,respectively.Compared with Sland,SOC storage under S.psammophila and P.sylvestris significantly increased by 94.90%,39.50%,27.10%and 18.50%at 20,80,150 and 240 cm distance,respectively.ROOC accounted for 14.09%and 18.93%of SOC under S.psammophila and P.sylvestris,respectively.Our results suggest that afforestation can promote SOC accumulation at different distances from the plants,and that P.sylvestris allocates more organic matter to the closer soil compared with S.psammophila(<80 cm from the tree).