文献类型： 外文期刊
第一作者： Yan Huimin
作者： Yan Huimin;Liu Fang;Niu Zhongen;Yang Yanzhao;Yan Huimin;Niu Zhongen;Yang Yanzhao;Gu Fengxue
作者机构：
关键词： Huang-Huai-Hai agricultural region; MCI; spatio-temporal dynamics; MODIS; EVI; landscape pattern
期刊名称：JOURNAL OF GEOGRAPHICAL SCIENCES （ 影响因子：3.534； 五年影响因子：3.647 ）
ISSN： 1009-637X
年卷期： 2018 年 28 卷 11 期
页码：
收录情况： SCI
摘要： Multiple cropping index (MCI) is the ratio of total sown area and cropland area in a region, which represents the regional time intensity of planting crops. Multiple cropping systems have effectively improved the utilization efficiency and production of cropland by increasing cropping frequency in one year. Meanwhile, it has also significantly altered biogeochemical cycles. Therefore, exploring the spatio-temporal dynamics of multiple cropping intensity is of great significance for ensuring food and ecological security. In this study, MCI of Huang-Huai-Hai agricultural region with intensive cropping practices was extracted based on a cropping intensity mapping algorithm using MODIS Enhanced Vegetation Index (EVI) time series at 500-m spatial resolution and 8-day time intervals. Then the physical characteristics and landscape pattern of MCI trends were analyzed from 2000-2012. Results showed that MCI in Huang-Huai-Hai agricultural region has increased from 152% to 156% in the 12 years. Topography is a primary factor in determining the spatial pattern dynamics of MCI, which is more stable in hilly area than in plain area. An increase from 158% to 164% of MCI occurred in plain area while there was almost no change in hilly area with single cropping. The most active region of MCI change was the intersection zone between the hilly area and plain area. In spatial patterns, landscape of multiple cropping systems tended to be homogenized reflected by a reduction in the degree of fragmentation and an increase in the degree of concentration of cropland with the same cropping system.
分类号：
- 相关文献
作者其他论文 更多>>
-
Knockdown of 60S ribosomal protein L14-2 reveals their potential regulatory roles to enhance drought and salt tolerance in cotton
作者：Shiraku, Margaret Linyerera;Magwanga, Richard Odongo;Cai Xiaoyan;Kirungu, Joy Nyangasi;Xu Yanchao;Mehari, Teame Gereziher;Hou Yuqing;Wang Yuhong;Wang Kunbo;Zhou Zhongli;Liu Fang;Magwanga, Richard Odongo;Peng Renhai;Liu Fang
关键词：Abiotic stress; Cotton; Ribosomal protein large; Transcription factor; Virus-induced gene silencing
-
Genetic map construction and functional characterization of genes within the segregation distortion regions (SDRs) in the F-2:3 populations derived from wild cotton species of the D genome
作者：Kirungu, Joy Nyangasi;Magwanga, Richard Odongo;Shiraku, Margaret Linyerera;Lu Pu;Mehari, Teame Gereziher;Xu Yuanchao;Hou Yuqing;Cai Xiaoyan;Zhou Zhongli;Wang Kunbo;Liu Fang;Magwanga, Richard Odongo;Agong, Stephen Gaya;Zhou Yun;Liu Fang
关键词：Genetic map; Segregation distortion region; Cis-regulatory elements; Genes; miRNA
-
Identification of QTLs and candidate genes for physiological traits associated with drought tolerance in cotton
作者：Magwanga, Richard Odongo;Lu Pu;Kirungu, Joy Nyangasi;Cai Xiaoyan;Zhou Zhongli;Wang Kunbo;Liu Fang;Magwanga, Richard Odongo;Agong, Stephen Gaya
关键词：Cotton spp.; Quantitative trait loci; Genetic map; Drought tolerance; miRNAs; Gene ontology
-
Identification of Major Locus Bph35 Resistance to Brown Planthopper in Rice
作者：Zhang Yuexiong;Ma Qianqian;Liu Fang;Li Rongbai;Zhang Yuexiong;Ma Qianqian;Liu Fang;Li Rongbai;Zhang Yuexiong;Qin Gang;Wei Minyi;Yang Xinghai;Ma Zengfeng;Liang Haifu;Liu Chi;Li Zhenjing;Huang Dahui
关键词：rice; brown planthopper; Bph35; bulked segregant analysis (BSA)-seq method; gene mapping
-
Efficient Surface Display of L-glutamate Oxidase and L-amino Acid Oxidase on Pichia pastoris Using Multi-copy Expression Strains
作者：Rao Ben;Zhou Ronghua;Dong Qing;Liao Xianqing;Liu Fang;Chen Wei;Liu Xiaoyan;Min Yong;Wang YaPing
关键词：alpha-ketoglutaric acid; displayed enzyme; multicopy expression; Pichia pastoris
-
High-level Expression of an Acidic and Thermostable Chitosanase inPichia pastorisUsing Multi-copy Expression Strains and High-cell-density Cultivation
作者：Zhou Ronghua;Liao Xianqing;Liu Fang;Dong Qing;Chen Wei;Rao, Ben;Wang YaPing
关键词：Chitosanase; high-density fermentation; multicopy strains; Pichia pastoris
-
Identification and characterization of cell cultures with various embryogenic/regenerative potential in cotton based on morphological, cytochemical, and cytogenetical assessment
作者：Guo Hui-hui;Wu Jian-fei;Chen Cui-xia;Chu Zhao-hui;Zeng Fan-chang;Wang Hong-mei;Zhao Yun-lei;Zhang Chao-jun;Jia Yin-hua;Liu Fang;Ning Tang-yuan
关键词：cotton somatic embryogenesis; cotton cell culture strains; cytochemical EB-AC double staining; cytogenetical ploidy stability; embryogenic/regenerative potential; morphology
