Prediction of Farmland Protection Area in County-level Land Use Planning: A Case Study of Mizhi County of Shaanxi Province

Taking Mizhi County as an example and the year of 2005 as base period of planning,this paper made a prediction of farmland demand in 2010 and 2020 using grain security method,supply-demand balance method,and trend extrapolation method. In addition,it built a fixed weight combination model to make scientific summary of three prediction results. Finally,it predicted the farmland demand of Mizhi County in 2010 and 2020 will be 40 967 hm2 and 36 556 hm2,which can provide basis and reference for determination of farmland protection area in the land use planning.

Bilingual Teaching Practice and Research of Introduction to Ecology in Physical Geography and Resource & Environment Discipline

Bilingual teaching of Introduction to Ecology is a new teaching practice adapting to the demands of the times. This paper firstly introduced the selection of teaching objects and teaching materials of the Introduction to Ecology in Physical Geography and Resource & Environment discipline. It mainly discussed three teaching methods for bilingual teaching of ecology: participating interactive teaching,heuristic teaching,and diversified teaching. Besides,it analyzed classroom effect and feedback of students of the bilingual teaching of the Introduction to Ecology. Finally,it came up with constructive recommendations for implementation of the bilingual teaching of the Introduction to Ecology.

Reponses and sensitivities of maize phenology to climate change from 1981 to 2009 in Henan Province, China

With the global warming, crop phenological shifts in responses to climate change have become a hot research topic. Based on the long-term observed agro-meteorological phenological data （1981-2009） and meteorological data, we quantitatively analyzed temporal and spatial shifts in maize phenology and their sensitivities to key climate factors change using climate tendency rate and sensitivity analysis methods. Results indicated that the sowing date was significantly delayed and the delay tendency rate was 9.0 d·10a^-1. But the stages from emergence to maturity occurred earlier （0.1 d·10a^-1〈θ〈1.7 d·10a^-1, θ is the change slope of maize phenology）. The length of vegetative period （VPL） （from emergence to tasseling） was shortened by 0.9 d·10a^-1, while the length of generative period （GPL） （from tasseling to maturity） was lengthened by 1.7 d·10a^-1. The growing season length （GSL） （from emergence to maturity） was lengthened by 0.4 d·10a^-1. Correlation analysis indicated that maize phenology was significantly correlated with average temperature, precipitation, sunshine duration and growing degree days （GDD） （p〈0.01）. Average temperature had significant negative correlation relationship, while precipitation, sunshine duration and growing degree days had significant positive correlations with maize phenology. Sensitivity analysis indicated that maize phenology showed different responses to variations in key climate factors, especially at different sites. The conclusions of this research could provide scientific supports for agricultural adaptation to climate change to address the global food security issue.

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.

基于多时相高分辨率遥感影像的斯里兰卡重要港口基础设施动态监测（英文）

Colombo port and Hambantota port in Sri Lanka play a key role in transiting and supporting the shipping trade of ＂the 21 st-Century Maritime Silk Road＂. In recent years, Chinese enterprises have made huge investments in the infrastructure construction of Colombo port and Hambantota port. The construction progress and development trend of Colombo port and Hambantota port have been attracting the attention of Chinese investment enterprises and the society. In this paper, multi-temporal high spatial resolution remote sensing images are used to monitor the infrastructure construction condition of Colombo port and Hambantota port from 2010 to 2017. According to the interpreted infrastructure information of the two ports, the international container terminal of Colombo and Hambantota port have completed their constructions. By the end of 2017, the international container terminal of Colombo built the container yards with 28.8 ha and roads with 32.6 ha. At the south of the international container terminal of Colombo, the 62.2 ha of reclamation area were built for the planned port city. In Hambantota port, 77 ha of container yards, 48 ha of roads and 2.9 ha of oil storage areas were constructed during this period. Meanwhile, the analysis of potential storage capacity of Colombo port and Hambantota port shows that the throughput of Colombo port may increase by 3 million tons per year while the throughput of Hambantota port will be over its designed 2.5 million tons per year. These analysis results are able to provide a useful reference for Chinese investment enterprises and the related research of ＂the Belt and Road＂.