Vol. 48, No.6, Tot No.338 2020----Institute of Geochemistry Chinese Academy of Sciences

EARTH AND ENVIRONMENT
Vol. 48, No.6, Tot No.338 2020

CONTENTS

	Research Results
643	The Pollen Records of Human Activities in Qinghai Tibet Plateau during the Middle and Late Holocene CHEN Xiaoliang et al
652	Spatial-temporal Variations and Influencing Factors of Formaldehyde in the Three Provinces of Northeast China during 2005-2018 HUANG Shuyuan et al
663	Spatio-temporal Distribution of PM2.5 during Winter and Spring Seasons in Shaanxi Province YI Wenli et al
672	Surface Soil Carbon Density and Turnover Rate of Typical Vegetation Types in Beijing Songshan National Nature Reserve LIANG Chen et al
680	Water Chemical Characteristics and the Substance Provenance in Anning River Basin of Sichuan Province LIAO Cheng et al
689	Production Mechanism of H2S at the Water air Interface of Groundwater at the Zengpiyan Cave Site WEI Minjie et al
	Applied Study
698	Preliminary Study on the Sedimentation Rate of Wetlands in the Lower Yellow River Based on the 210Pb and 137Cs Dating Techniques GU Jiawei （698）
704	Desorption Characteristics of PCB138 in Two Soils and Their Organic Matter Components CONG Xin et al
711	Adsorption Characteristics of Lead Ions in Wastewater by Four Plant Derived Materials ZHANG Dan et al
719	Environmental Geochemistry Assessment of Heavy Metals in Soil at the Huijiabao Au Mine Field in Guizhou, China LI Lei et al
728	Hydrogen and Oxygen Isotope Signatures of Soil Water in the Thick Unsaturated Zone and the Source Identification XIE Jinyan et al
	Special Subject and Review
736	Advances in Preparation of Biochar from Eupatorium Adenophorum and Its Application FENG Qianwei et al
747	A Review on Biodegradation of Persistent Organic Pollutants by Whit-rot Fungi YIN Ru et al