中国半干旱草原施氮梯度下的土壤激发效应（英文）

为了探究施氮对土壤有机质(SOM)的激发效应,本研究在施氮梯度样地(0、4和16 g N m^–2 yr^–1)上进行了¹³C标记葡萄糖的原位添加实验,并对土壤CO_2排放量和磷脂脂肪酸(PLFA)含量进行了测定。研究发现施氮降低了土壤CO_2排放、土壤PLFA含量以及土壤真菌细菌比。在0 g N m^–2 yr^–1样地上葡萄糖添加导致的正向激发效应最强,同时4 g N m^–2 yr^–1样地释放的葡萄糖来源的碳最多。因此,施氮减少了土壤中SOM转化产生的CO_2,微生物碳的来源由SOM转变为添加的易分解碳。本研究采样早期土壤微生物生物量和群落结构稳定,表明该草原存在"表观激发效应",因此未来研究应着重对微生物功能的多样性进行探讨。     

中国气温变化对全球变暖停滞的响应（英文）

The 1998–2012 global warming hiatus has aroused great public interest over the past several years. Based on the air temperature measurements from 622 meteorological stations in China, the temperature response to the global warming hiatus was analyzed at national and regional scales. We found that air temperature changed –0.221℃/10 a during 1998–2012, which was lower than the long-term trend for 1960–1998 by 0.427℃/10 a. Therefore, the warming hiatus in China was more pronounced than the global mean. Winter played a dominant role in the nationwide warming hiatus, contributing 74.13%, while summer contributed the least among the four seasons. Furthermore, the warming hiatus was spatial heterogeneous across different climate conditions in China. Comparing the three geographic zones, the monsoon region of eastern China, arid region of northwestern China, and high frigid region of the Tibetan Plateau, there was significant cooling in eastern and northwestern China. In eastern China, which contributed 53.79%, the trend magnitudes were 0.896℃/10 a in winter and 0.134℃/10 a in summer. In the Tibetan Plateau, air temperature increased by 0.204℃/10 a, indicating a lack of a significant warming hiatus. More broadly, the warming hiatus in China may have been associated with the negative phase of PDO and reduction in sunspot numbers and total solar radiation. Finally, although a warming hiatus occurred in China from 1998 to 2012, air temperature rapidly increased after 2012 and will likely to continuously warm in the next few years.     

气候变化影响下西藏旅游气候舒适度变化与适应对策（英文）

Climate change is an important factor affecting the sustainable development of tourist destinations. Based on the monthly observation data of the main meteorological stations on the ground in Tibet from 1960 to 2015, this paper constructs a tourism climate index model. This index is used to quantitatively evaluate the tourism climate changes in Tibet, and investigate the impact of climate change on tourism. The results show that from 1960 to 2015, the temperature in Tibet increased by 1.35°C, and the tourism climate index changed significantly, especially in the regions of Changtang, Ngari and Kunlun Mountain. The fluctuation of temperature-humidity index, wind-chill index and index of clothing of these areas was larger than that of other regions. The changes of each index in different months are different, where spring observes larger changes while summer observes smaller changes. The tourism climate index in northwestern Tibet has increased, and the climate comfort period is expanding. In southeastern Tibet, the comfort level has declined and the comfort level in the central part has been slowly increasing. The comfort index in the southeastern part of Tibet has gradually declined, and the comfort index in central Tibet has slowly increased. According to the comprehensive assessment method including temperature and humidity index, wind-chill index, index of clothing and altitude adaptability index, the types of tourism climate index in Tibet can be divided into reduced, low-speed growth, medium-speed growth and rapid growth. Different regions should adopt alternative tourism products, strengthen energy conservation and emission reduction technology applications and green infrastructure construction, and appropriately control the scale of tourism activities so as to adapt to and mitigate the impact of climate change on tourist destinations.     

全球气候变暖条件下黄河流域降水的可能变化

利用最近50年气象站观测的降水量以及根据史料和树轮重建的近400年来的降水量，根据回归分析和合成分析研究了黄河流域降水与全球气温变化的关系及其可能成因。结果表明，全球平均气温偏高（低）与黄河中游地区年降水量偏少（多）存在一定的对应关系。夏末秋初的8-9月是决定全年降水变化的关键时期，全球气候变暖会引起8-9月西太平洋副热带高压增强、扩大，从而有利于东亚夏季风锋面位置北移，进而使东亚夏季风北界南侧黄河中游一带的降水减少。     

农业物候动态对地表生物物理过程及气候的反馈研究进展（英文）

Response and feedback of land surface process to climate change is one of the research priorities in the field of geoscience. The current study paid more attention to the impacts of global change on land surface process, but the feedback of land surface process to climate change has been poorly understood. It is becoming more and more meaningful under the framework of Earth system science to understand systematically the relationships between agricultural phenology dynamic and biophysical process, as well as the feedback on climate. In this paper, we summarized the research progress in this field, including the fact of agricultural phenology change, parameterization of phenology dynamic in land surface progress model, the influence of agricultural phenology dynamic on biophysical process, as well as its feedback on climate. The results showed that the agriculture phenophase, represented by the key phenological phases such as sowing, flowering and maturity, had shifted significantly due to the impacts of climate change and agronomic management. The digital expressions of land surface dynamic process, as well as the biophysical process and atmospheric process, were improved by coupling phenology dynamic in land surface model. The agricultural phenology dynamic had influenced net radiation, latent heat, sensible heat, albedo, temperature, precipitation, circulation, playing an important role in the surface energy partitioning and climate feedback. Considering the importance of agricultural phenology dynamic in land surface biophysical process and climate feedback, the following research priorities should be stressed:(1) the interactions between climate change and land surface phenology dynamic;(2) the relations between agricultural phenology dynamic and land surface reflectivity at different spectrums;(3) the contributions of crop physiology characteristic changes to land surface biophysical process;(4) the regional differences of climate feedbacks from phenology dynamic in different climate zones. This review is helpful to accelerate understanding of the role of agricultural phenology dynamic in land surface process and climate feedback.     

应对气候变暖:中国旅游业的政策和行动（英文）

中国旅游业规模大且近年来发展迅速,是全球旅游应对气候变暖的重要组成部分。本文运用PSR框架,综述性考察中国旅游业的减排压力、碳排放状态和以政府为主的利益相关者反应。研究发现:(1)源于中央政府的节能减排战略要求和旅游业快速壮大的产业规模,中国旅游业具有较大的碳减排压力。(2)中国旅游业碳排放量占全球旅游的12.5%–14.6%,占中国碳排放的3%左右,中国游客每人次旅游碳排放量低于全球水平的1/2。(3)中国政府重视节能减排,国家旅游局等部门主要通过制定行业标准的方式,引导饭店、景区等旅游企业建立绿色经营和管理体系;在交通领域,近年来中国高速铁路、新能源汽车、城市智能共享单车发展十分迅速,有效降低了旅行中的碳排放;中国游客普遍具有较高的低碳旅游认知和意愿,但也还需要更多的宣传和引导提高公众意识。     

西藏纳木错植物物候及其对气候的响应

利用纳木错流域1O种代表性植物2007年和2008年的物候观测资料,分析了植物生殖物候的基本特征及气候条件对其的影响.植物最早5月中旬进入开花期,大部分植物的盛花期在6月中旬至7月下旬,开花的最适温度范围为8.5-8.9℃,花期延续到9月下旬.从6月上旬开始,大部分植物进入果期,多数植物果期与花期重叠.纳木错具有高寒地带植物物候的普遍特征:生长期较短(5个月左右)、早花现象、晚花现象.同2007年相比,2008年雨季提前,虽然气温偏低,大部分植物花期和果期普遍缩短5 d左右,但物候期提前约20 d.植物物候的年际变化对气候变化,特别是对降水量的季节分配更敏感.     

2000-2016年青海湖湖冰物候特征变化（英文）

Lake ice phenology is considered a sensitive indicator of regional climate change. We utilized time series information of this kind extracted from a series of multi-source remote sensing(RS) datasets including the MOD09 GQ surface reflectance product, Landsat TM/ETM_+ images, and meteorological records to analyze spatiotemporal variations of ice phenology of Qinghai Lake between 2000 and 2016 applying both RS and GIS technology. We also identified the climatic factors that have influenced lake ice phenology over time and draw a number of conclusions. First, data show that freeze-up start(FUS), freeze-up end(FUE), break-up start(BUS), and break-up end(BUE) on Qinghai Lake usually occurred in mid-December, early January, mid-to-late March, and early April, respectively. The average freezing duration(FD, between FUE and BUE), complete freezing duration(CFD, between FUE and BUS), ice coverage duration(ICD, between FUS and BUE), and ablation duration(AD, between BUS and BUE) were 88 days, 77 days, 108 days and 10 days, respectively. Second, while the results of this analysis reveal considerable differences in ice phenology on Qinghai Lake between 2000 and 2016, there has been relatively little variation in FUS times. Data show that FUE dates had also tended to fluctuate over time, initially advancing and then being delayed, while the opposite was the case for BUS dates as these advanced between 2012 and 2016. Overall, there was a shortening trend of Qinghai Lake's FD in two periods, 2000–2005 and 2010–2016, which was shorter than those seen on other lakes within the hinterland of the Tibetan Plateau. Third, Qinghai Lake can be characterized by similar spatial patterns in both freeze-up(FU) and break-up(BU) processes, as parts of the surface which freeze earlier also start to melt first, distinctly different from some other lakes on the Tibetan Plateau. A further feature of Qinghai Lake ice phenology is that FU duration(between 18 days and 31 days) is about 10 days longer than BU duration(between 7 days and 20 days). Fourth, data show that negative temperature accumulated during the winter half year(between October and the following April) also plays a dominant role in ice phenology variations of Qinghai Lake. Precipitation and wind speed both also exert direct influences on the formation and melting of lake ice cover and also cannot be neglected.     

土地利用与土地覆盖变化对气候影响的国别对比（英文）

Land use and land cover change(LULCC) strongly influence regional and global climate by combining both biochemical and biophysical processes. However, the biophysical process was often ignored, which may offset the biogeochemical effects, so measures to address climate change could not reach the target. Thus, the biophysical influence of LULCC is critical for understanding observed climate changes in the past and potential scenarios in the future. Therefore, it is necessary to identify the mechanisms and effects of large-scale LULCC on climate change through changing the underlying surface, and thus the energy balance. The key scientific issues on understanding the impacts of human activities on global climate that must be addressed including:(1) what are the basic scientific facts of spatial and temporal variations of LULCC in China and comparative countries?(2) How to understand the coupling driving mechanisms of human activities and climate change on the LULCC and then to forecasting the future scenarios?(3) What are the scientific mechanisms of LULCC impacts on biophysical processes of land surface, and then the climate?(4) How to estimate the contributions of LULCC to climate change by affecting biophysical processes of land surface? By international comparison, the impacts of LULCC on climate change at the local, regional and global scales were revealed and evaluated. It can provide theoretical basis for the global change, and have great significance to mitigate and adapt to global climate changes.     

利用物候相机绿度指数分析温带草原生态系统的植被物候及其与气象因子关系（英文）

近地面数码相机在区域和景观尺度上的植被物候参数分析中发挥着重要作用。评估数码照片提取的绿度指数(Gcc,相对绿度指数)与卫星绿度指数的相关性有助于推进陆面过程的研究工作。另外,在北美大草原地区,Gcc时间序列数据对环境因子的响应仍然不清晰。首先,本文在生态观测站点尺度,评估了日尺度的相对绿度指数与日值气象因子的响应关系,如土壤湿度、土壤温度、气温和太阳辐射等。其次,基于站点Gcc数据、MODIS和VIIRS卫星植被指数数据,利用曲线求导方法获得植被的关键物候参数,包括生长季开始点、结束点、最大生长点等,并比较了不同数据源物候参数的差异。结果表明:日尺度Gcc数据能够很好的地反映地面环境因子的变化情况;多元线性回归分析表明研究区草原生长主要受土壤温度和太阳辐射的影响,受气温影响较小;高频的Gcc时间序列数据可以及时响应降水的变化;在相同年份,数码相机和卫星数据提取的物候参数具有一致性,但是在春季物候上差异较显著,生长速率和衰落速率的提取结果并不一致;Gcc提取的生长季长度与根据气温计算的生长度(GDD)长度相关性较好。本文评估了基于数码相机的植被物候监测及其与气象因子的关系,研究有助于多尺度植被物候建模与温带大草原区域的草原资源管理。     

西藏高寒草甸冠层光合参数的遥感估算：站点研究（英文）

太阳辐射驱动的植物光合作用是所有生物圈功能的基础。高寒草甸生态系统范围广,土壤碳密度高,气候变化剧烈,因此是高寒生态系统关键过程响应气候变化的指示器。然而,对高寒草甸生态系统光合作用的主要参数,包括被冠层吸收的光合有效辐射占比(FPAR)、冠层消光系数(k)和冠层叶面积指数(LAI)季节动态的研究较为缺乏。利用2009–2011年太阳辐射各组分和植被叶面积指数观测,分别估算了位于西藏自治区当雄县一个典型的高寒草地生态系统的这三个光合参数,并与最新MODIS(collection6)遥感FPAR(FPAR_MOD)和LAI产品(LAI_MOD)进行了对比。此外,基于比尔–朗伯吸收定律和MODIS植被指数产品(归一化植被指数NDVI和增强型植被指数EVI),本研究介绍了一个纯遥感手段估算高寒草甸生态系统植被冠层光合参数季节动态的方法。结果表明:2009–2011年该研究区高寒草甸日均FPAR分别是0.33、0.37和0.35,所有4个基于遥感的FPAR产品,包括FPAR_MOD、基于比尔–朗伯吸收定律(常数化消光系数为0.5)估算的FPAR_LAI,以及2个利用MODIS植被指数产品与FPAR地面观测(FAPRg)建立非线性统计模型估算的FPAR(FPAR_NDVI和FPAR_EVI)均对FPARg的年内季节变异做出了很好的解释。相比而言,FPAR_MOD严重低估了FPARg,低估量超过了FPARg本身的40%;FPAR_LAI也明显低估了FPARg,低估量将近20%,这主要是由于比尔–朗伯吸收定律中k值在整个生长季都被设置为常数0.5,因此用FPAR_LAI去校准FPAR_MOD在该高寒草甸不是一个科学合理的方法。通过遥感估算,该高寒草甸的k值存在明显的季节变异,变异范围是0.19–2.95。考虑k值的季节变化后,FPAR_NDVI和FPAR_EVI明显地提高了对FPARg的估算精度,二者对FPARg虽然有轻微的高估,但高估量均不到5%(RMSE=0.05)。基于植被指数(NDVI和EVI)模拟的FPAR和k的季节动态,利用比尔–朗伯吸收定律估算的植被叶面积指数(LAI_NDVI和LAI_EVI)明显提高了遥感LAI_MOD产品的准确度。本研究揭示了基于比尔–朗伯吸收定律,植被指数构建的遥感模型可以提供该高寒草甸FPAR、k和LAI季节动态简单而有效的估算方法。     

区域气候变化对西藏扎布耶、当雄错、班戈湖变化的影响（英文）

The lake hydrological and meteorological data of the Tibetan Plateau are not rich. This research reports the observed climatic data and measured water levels of saline lakes from the local meteorological stations in the Zabuye salt lake, the Dangqiong Co salt lake and the Bankog Co salt lake in recent two decades. Combining with satellite remote sensing maps, we have analyzed the changes of the water level of these three lakes in recent years and discussed the origins of the changes induced by the meteorological factors. The results show that the annual mean temperature and the water level reflect a general ascending trend in these three lakes during the observation period. The rising rates of the annual mean temperature were 0.08℃/yr during 1991–2014 and 0.07℃/yr during 2004–2014, and of the water level, were 0.032 m/yr and 0.24 m/yr, respectively. Analysis of changes of the meteorological factors shows the main cause for the increase of lake water quantity are the reduced lake evaporation and the increased precipitation in the lake basins by the rise of average temperature. Seasonal variation of lake water level is powered largely by the supply of lake water types and the seasonal change of regional climate.     

2000–2015年柴达木盆地植被物候时空变化及其对气候变化的响应（英文）

Based on TIMESAT 3.2 platform, MODIS NDVI data(2000–2015) of Qaidam Basin are fitted, and three main phenological parameters are extracted with the method of dynamic threshold, including the start of growth season(SGS), the end of growth season(EGS) and the length of growth season(LGS). The spatial and temporal variation of vegetation phenology and its response to climate changes are analyzed respectively. The conclusions are as follows:(1) SGS is mainly delayed as a whole. Areas delayed are more than the advanced in EGS, and EGS is a little delayed as a whole. LGS is generally shortened.(2) With the altitude rising, SGS is delayed, EGS is advanced, and LGS is shortened and phenophase appears a big variation below 3000 m and above 5000 m.(3) From 2000 to 2015, the temperature appears a slight increase along with a big fluctuation, and the precipitation increases evidently.(4) Response of phenophase to precipitation is not obvious in the low elevation humid regions, where SGS arrives early and EGS delays; while, in the upper part of the mountain regions, SGS delays and EGS advances with temperature rising, SGS arrives early and EGS delays with precipitation increasing.     

中国干旱半干旱地区草地植被碳存量动态变化及其对气候和地形的响应（英文）

草地生态系统在干旱、半干旱地区的生态稳定和陆地生态系统碳循环中扮演着重要的作用。但是,有关干旱、半干旱地区草地植被碳存量动态变化及其对气候和地形因素的响应研究却很少。本研究利用2001–2012年的气象数据、NDVI(normalized difference vegetation index)数据及改进型CASA(Carnegie Ames Stanford Approach)模型模拟估算草地植被碳存量时空动态变化及其对气候和地形因素的响应。研究结果表明:(1)甘肃省草地植被碳存量为4.4×1014 gC,年增长率为9.8×1011 gC(P0.05),草地植被碳密度为136.5 gC m~(–2)。(2)草地植被碳密度和碳存量表现出较强的时空变化特征,基本与温度、降水量和太阳辐射的时空变化保持一致,且在高程2500–3500 m、坡度30°和坡向朝东的时候达到最大值。(3)气象要素(温度、降水量和太阳辐射)对5种草地类型(沙漠和盐碱草地、典型草原、高寒草地、灌草丛和林下草地)植被碳密度的影响主要取决于在空间尺度上草地植被所能获取的水分和热量。研究结果不仅能够为合理解释草地植被碳存量动态变化的时空异质性提供新的证据,同时也能为我国干旱、半干旱地区草地农业管理提供理论和实践基础。     

伏牛山地森林植被物候及其对气候变化的响应（英文）

This paper reports the phenological response of forest vegetation to climate change(changes in temperature and precipitation) based on Moderate Resolution Imaging Spectroradiometer(MODIS) Enhanced Vegetation Index(EVI) time-series images from 2000 to 2015. The phenological parameters of forest vegetation in the Funiu Mountains during this period were determined from the temperature and precipitation data using the Savitzky–Golay filter method, dynamic threshold method, Mann-Kendall trend test, the Theil-Sen estimator, ANUSPLIN interpolation and correlation analyses. The results are summarized as follows:(1) The start of the growing season(SOS) of the forest vegetation mainly concentrated in day of year(DOY) 105–120, the end of the growing season(EOS) concentrated in DOY 285–315, and the growing season length(GSL) ranged between 165 and 195 days. There is an evident correlation between forest phenology and altitude. With increasing altitude, the SOS, EOS and GSL presented a significant delayed, advanced and shortening trend, respectively.(2) Both SOS and EOS of the forest vegetation displayed the delayed trend, the delayed pixels accounted for 76.57% and 83.81% of the total, respectively. The GSL of the forest vegetation was lengthened, and the lengthened pixels accounted for 61.21% of the total. The change in GSL was mainly caused by the decrease in spring temperature in the region.(3) The SOS of the forest vegetation was significantly partially correlated with the monthly average temperature in March, with most correlations being negative; that is, the delay in SOS was mainly attributed to the temperature decrease in March. The EOS was significantly partially correlated with precipitation in September, with most correlations being positive; that is, the EOS was clearly delayed with increasing precipitation in September. The GSL of the forest vegetation was influenced by both temperature and precipitation throughout the growing season. For most regions, GSL was most closely related to the monthly average temperature and precipitation in August.     

祁连山老虎沟冰芯记录的高山区大气降水变化（英文）

The net accumulation record of ice core is one of the most reliable indicators for reconstructing precipitation changes in high mountains.A 20.12 m ice core was drilled in 2006 from the accumulation zone of Laohugou Glacier No.12 in the northeastern Tibetan Plateau,China.We obtained the precipitation from the ice core net accumulation during 1960-2006,and found out the relationship between Laohugou ice core record and other data from surrounding sites of the northeastern Tibetan Plateau.Results showed that during 1960-2006,the precipitation in the high mountains showed firstly an increasing trend,while during 1980 to 2006 it showed an obvious decreasing trend.Reconstructed precipitation change in the Laohugou glacier basin was consistent with the measured data from the nearby weather stations in the lower mountain of Subei,and the correlation coefficient was 0.619(P<0.001).However,the precipitation in the high mountain was about 3 times more than that of the lower mountain.The precipitation in Laohugou Glacier No.12 of the western Qilian Mountains corresponded well to the net accumulation of Dunde ice core during the same period,tree-ring reconstructed precipitation,the measured data of multiple meteorological stations in the northeastern Tibetan Plateau,and also the changes of adjacent PDSI drought index.Precipitation changes of the Laohugou glacier basin and other sites of the northeastern Tibetan Plateau had significantly positive correlation with ENSO,which implied that the regional alpine precipitation change was very likely to be influenced by ENSO.     

西北干旱荒漠区风蚀气候侵蚀力时空变化特征（英文）

土壤风蚀是制约西北干旱荒漠地区社会活动与经济发展的重要因素。为揭示西北干旱荒漠区土壤风蚀气候侵蚀力分布,通过中国区域地面长时间序列气象要素驱动数据,并结合Arc GIS软件分析,评估了该区风蚀气候侵蚀力时空变化与转移特征。研究结果显示：（1）西北干旱荒漠区在降水量、风速以及多年平均温度等气象因素均表现为随年代际递增的背景下,风蚀气候侵蚀力呈现出整体降低,大部分区域C值介于0-100,但在腹地及少数部分区域为增长趋势,C值高于150;(2)月际C值变化差异明显,春夏季最大、其次为冬季,最小为秋季;突变性检验发现风蚀气候侵蚀力在春季变异最强,有4个突变点,且长期处于波动式下降;（3）区域土壤风蚀程度由腹地向四周逐渐减小,且高侵蚀影响面积逐年递增;（4）风蚀气候侵蚀力时空转移变化特征表现为整体为小幅度衰减,但部分地区却表现为增加甚至明显增加趋势。研究成果可为西北干旱荒漠区风沙灾害防治提供相应的理论依据和科技支撑。     

气候变化背景下1981-2010年中国玉米物候变化时空分异（英文）

Spatio-temporal changes in the differentiation characteristics of eight consecutive phenological periods and their corresponding lengths were quantitatively analyzed based on long-term phenological observation data from 114 agro-meteorological stations in four maize growing zones in China. Results showed that average air temperature and growing degree-days (GDD) during maize growing seasons showed an increasing trend from 1981 to 2010, while precipitation and sunshine duration showed a decreasing trend. Maize phenology has significantly changed under climate change: spring maize phenology was mainly advanced, especially in northwest and southwest maize zones, while summer and spring-summer maize phenology was delayed. The delay trend observed for summer maize in the northwest maize zone was more pronounced than in the Huang-Huai spring-summer maize zone. Variations in maize phenology changed the corresponding growth stages length: the vegetative growth period (days from sowing date to tasseling date) was generally shortened in spring, summer, and spring-summer maize, although to different degrees, while the reproductive growth period (days from tasseling date to mature date) showed an extension trend. The entire growth period(days from sowing date to mature date) of spring maize was extended, but the entire growth periods of summer and spring-summer maize were shortened.     

全球气候变暖背景下的土地干旱化现象研究——以贝加尔地区为例（英文）

气候变暖、干旱化和荒漠化导致了自然过程极端事件的增加。本文认为气候变暖、干旱化和荒漠化过程作为整体系统的组成部分,是生态平衡的重大不稳定因素。自然过程极值的增长是生态系统失衡的一种表现形式。气候变暖、干旱化和荒漠化加剧了跨贝加尔地区生态系统的失衡及当地紧张的环境局势。本文采用大气和土壤参数的均方根差及Walter-Gossen气候图表定量估计了跨贝加尔地区的干旱状态,并提供了永久冻土区对长期变暖响应的有关信息。     

1951–2010年中国农业水热气候条件的时空变化（英文）

Based on the daily observation data of 824 meteorological stations during 1951-2010 released by the National Meteorological Information Center, this paper evaluated the changes in the heat and moisture conditions of crop growth. An average value of ten years was used to analyze the spatio-temporal variation in the agricultural hydrothermal conditions within a 1 km2 grid. Next, the inter-annual changing trend was simulated by regression analysis of the agricultural hydrothermal conditions. The results showed that the contour lines for temperature and accumulated temperatures(the daily mean temperature ≥0°C) increased significantly in most parts of China, and that the temperature contour lines had all moved northwards over the past 60 years. At the same time, the annual precipitation showed a decreasing trend, though more than half of the meteorological stations did not pass the significance test. However, the mean temperatures in the hottest month and the coldest month exhibited a decreasing trend from 1951 to 2010. In addition, the 0°C contour line gradually moved from the Qinling Mountains and Huaihe River Basin to the Yellow River Basin. All these changes would have a significant impact on the distribution of crops and farming systems. Although the mechanisms influencing the interactive temperature and precipitation changes on crops were complex and hard to distinguish, the fact remained that these changes would directly cause corresponding changes in crop characteristics.