Assessment of organic pollution for surface soil in Shenyang suburbs Freezing damage in early spring induced by simulated global warming: a case study in Abies faxoniana Modern pollen distribution in the middle and north of Luliang Mountains, Shanxi Province Spatiotemporal variation of soil moisture under different land use types in a typical karst hill region NITROGEN ISOTOPE COMPOSITIONS AND SPATIAL DISTRIBUTION CHARACTERISTICS OF SOIL IN THE PROCESS OF KARST ROCKY DESERTIFICATION Soil nitrification in root surface and rhizosphere at late growth stages of rice cultivars with different N use efficiency Sources and assessment of heavy metal contamination in water-level fluctuation zone of the Three Gorges Reservoir, China Seeking relationship between vegetation and Picea pollen in surface soils of Xinjiang, northwestern China