土地利用变化与生态效应的关联研究是全球环境变化研究领域的热点。土地利用变化下的生境质量变化研究为生态保护及土地管理政策的制定提供了重要依据。运用GIS技术和InVEST模型,基于2005—2015年遥感数据对内蒙古巴林右旗生境质量变化...土地利用变化与生态效应的关联研究是全球环境变化研究领域的热点。土地利用变化下的生境质量变化研究为生态保护及土地管理政策的制定提供了重要依据。运用GIS技术和InVEST模型,基于2005—2015年遥感数据对内蒙古巴林右旗生境质量变化进行分析。结果表明:巴林右旗土地利用类型以草地、林地和耕地为主,3者面积占全旗土地总面积的85%以上。2005—2015年,湿地、建设用地和林地面积分别增加335.01、298.29和258.67 km 2,增长率分别为91.80%、301.85%和12.07%,耕地、草地和未利用地面积分别减少533.98、279.28和78.71 km 2,减少率分别为28.34%、5.63%和15.40%。10 a间,草地、林地、旱地和沙地转换面积较大,其中,旱地和沙地转换为重要生态用地(林地、草地、湿地)的面积为948.70和303.53 km 2。巴林右旗生境质量指数表现出明显的空间分异特征,其中,2005年较低等级生境质量区域面积占比最大,而2010、2015年则均以高等级生境质量区域面积占比为最大。10 a间,高、较高和低等级生境质量区域面积均有所增加,高等级生境质量区域面积增长和较低等级生境质量区域面积减少最显著,变化率分别为39.65%和37.55%。10 a间,研究区平均生境质量指数由0.457提高到0.528,总体表现为上升趋势,表明该区域生境质量总体趋于好转,退耕还林还草工程的实施对该地区生态恢复起到了积极的促进作用。展开更多
The leaf and stem types are core structural characteristics of the rice phenotype that determine the light interception ability of the canopy and directly affect crop yield.The PLANT ARCHITECTURE AND YIELD 1(PAY1)gene...The leaf and stem types are core structural characteristics of the rice phenotype that determine the light interception ability of the canopy and directly affect crop yield.The PLANT ARCHITECTURE AND YIELD 1(PAY1)gene has been shown to alter the prostrate growth habit of wild rice and to inhibit the wild rice prostrate growth gene PROSTRATE GROWTH 1(PROG1).In this paper,the wild rice introgression line YIL55,which contains the PROG1 gene;its mutant,PAY1;and its parent,TQ,were used as test varieties to construct three-dimensional(3D)canopy structure models based on 3D digital assay technology.On this basis,quantitative analyses of the PAY1 gene and the plant leaf and stem types at the jointing,heading and filling stages were performed.Under the influence of the PAY1 gene,the plant stem and leaf angles from vertical decreased significantly;the plants were upright,with larger leaves;the culm angle changed from loose to compact;and the average tiller angle during the three key reproductive stages decreased from 44.9,28.5 and 21.3°to 17.6,8.4 and 10.5°,respectively.Moreover,the PAY1 mutant retained the PROG1 gene characteristic of exhibiting dynamic changes in the tiller angle throughout the growth period,and its culm angle changed from loose during the jointing stage to compact during the heading stage.The measurements of photosynthetically active radiation(PAR)in the canopy also showed that the mutant PAY1 allowed more PAR to reach the bottom of the canopy than the other varieties.The light-extinction coefficients for PAY1 at the jointing,heading and filling stages were 0.535,0.312 and 0.586,respectively,which were lower than those of the other two varieties.In this study,the influence of the PAY1 gene on rice canopy structural characteristics was quantitatively analyzed to provide effective canopy structure parameters for breeding the ideal plant type.展开更多
文摘土地利用变化与生态效应的关联研究是全球环境变化研究领域的热点。土地利用变化下的生境质量变化研究为生态保护及土地管理政策的制定提供了重要依据。运用GIS技术和InVEST模型,基于2005—2015年遥感数据对内蒙古巴林右旗生境质量变化进行分析。结果表明:巴林右旗土地利用类型以草地、林地和耕地为主,3者面积占全旗土地总面积的85%以上。2005—2015年,湿地、建设用地和林地面积分别增加335.01、298.29和258.67 km 2,增长率分别为91.80%、301.85%和12.07%,耕地、草地和未利用地面积分别减少533.98、279.28和78.71 km 2,减少率分别为28.34%、5.63%和15.40%。10 a间,草地、林地、旱地和沙地转换面积较大,其中,旱地和沙地转换为重要生态用地(林地、草地、湿地)的面积为948.70和303.53 km 2。巴林右旗生境质量指数表现出明显的空间分异特征,其中,2005年较低等级生境质量区域面积占比最大,而2010、2015年则均以高等级生境质量区域面积占比为最大。10 a间,高、较高和低等级生境质量区域面积均有所增加,高等级生境质量区域面积增长和较低等级生境质量区域面积减少最显著,变化率分别为39.65%和37.55%。10 a间,研究区平均生境质量指数由0.457提高到0.528,总体表现为上升趋势,表明该区域生境质量总体趋于好转,退耕还林还草工程的实施对该地区生态恢复起到了积极的促进作用。
基金the General Project of Natural Science Research in Higher Education Institutions in Jiangsu Province,China(18KJB210003)the Natural Science Foundation of Jiangsu Province,China(BK20200112)the Postdoctoral Research Funding Scheme of Jiangsu Province,China(2018K067B).
文摘The leaf and stem types are core structural characteristics of the rice phenotype that determine the light interception ability of the canopy and directly affect crop yield.The PLANT ARCHITECTURE AND YIELD 1(PAY1)gene has been shown to alter the prostrate growth habit of wild rice and to inhibit the wild rice prostrate growth gene PROSTRATE GROWTH 1(PROG1).In this paper,the wild rice introgression line YIL55,which contains the PROG1 gene;its mutant,PAY1;and its parent,TQ,were used as test varieties to construct three-dimensional(3D)canopy structure models based on 3D digital assay technology.On this basis,quantitative analyses of the PAY1 gene and the plant leaf and stem types at the jointing,heading and filling stages were performed.Under the influence of the PAY1 gene,the plant stem and leaf angles from vertical decreased significantly;the plants were upright,with larger leaves;the culm angle changed from loose to compact;and the average tiller angle during the three key reproductive stages decreased from 44.9,28.5 and 21.3°to 17.6,8.4 and 10.5°,respectively.Moreover,the PAY1 mutant retained the PROG1 gene characteristic of exhibiting dynamic changes in the tiller angle throughout the growth period,and its culm angle changed from loose during the jointing stage to compact during the heading stage.The measurements of photosynthetically active radiation(PAR)in the canopy also showed that the mutant PAY1 allowed more PAR to reach the bottom of the canopy than the other varieties.The light-extinction coefficients for PAY1 at the jointing,heading and filling stages were 0.535,0.312 and 0.586,respectively,which were lower than those of the other two varieties.In this study,the influence of the PAY1 gene on rice canopy structural characteristics was quantitatively analyzed to provide effective canopy structure parameters for breeding the ideal plant type.
