Progress and perspective of agro\|pasturage ecotone Ecosystem services of wheat-maize cropland systems in the North China Plain Nitrogen flux and its manipulation in the cropland ecosystem of the North China Plain Progress on techniques for partitioning soil respiration components and their application in cropland ecosystem Estimation of regional evapotranspiration over the Hufu Plain using STME and MODIS data Ecological Water Use and Optimization Analysis of Northern Ecotone ——Taking Guyuan County of Hebei Province As a Example Effects of tillage conversion on carbon sequestration capability of farmland soil doubled cropped with wheat and corn. Effect of cropland ecological conditions on soil nutrient and humic acid characteristics of gray desert soil Determining the effect of the land consolidation project on the cropland ecosystem based on the ecological flow method Variation of ozone concentration of winter wheat field and mechanistic analysis of its possible effect on wheat yield in Northwest-Shandong Plain of China Estimation of transpiration and evaporation of different ecosystems in an inland river basin using remote sensing data and the Penman-Monteith equation