PALAEO_BIODIVERSITY AT THE NORTHERN PIEDMONT OF TIANSHAN MOUNTAINS IN XINJIANG DURING THE MIDDLE TO LATE HOLOCENE Plant diversity and its elevational gradient patterns in Mengshan Mountain, Shandong, China Study on the plant diversity under typical eucalyptus plantation in Zijin and Huidong, Guangdong province Effects of dimethyl disulfide on microbial communities in protectorate soils under continuous cropping