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25-ha deciduous broad-leaved forest plotat Baotianman in HenanPrincipal Investigator / Xiaojun Du, IB, CAS. His research interests focus on forest ecology,biodiversity, community maintenance mechanisms.Research Team / Yan Zhu, Yonggang Liu, Xingxing Man, Dongmei YuCollaborators / Yongzhong Ye, Zongcai Liu, Guang QiPlot IntroductionThe Baotianman National Natural Reserve, with the area of 5412.5hm 2 , is located inNeixiang County, Nanyang Region, Henan Province, China. The Baotianman Reserveis one of few reserves to protect natural forests and wild animals in the transitionzones between warm temperate zone and subtropical zone in Central China.The 25ha Baotianman forest permanent plot was established in 2009,33.49º N,111.94 ºE. The mean annual temperature is 15.1°C, and mean annual precipitation is885.6mm.The dominant vegetation of the Baotianman plot is the temperate deciduous broadleavedforest and conifer-broadleaved mixed forest. The following items are monitored: (1) thetopography in the 25ha Baotianman forest plot was measured by the electronic totalstation; (2) all free-standing individuals with DBH (diameter at breast height) ≥1cmwere tagged, mapped and identified to species. The dominant families in the forest areFagaceae, Tiliaceae, Aceraceae, Pinaceae, Cornaceae, Betulaceae, etc. The dominanttree species are Quercus aliena var. acutiserrata, Acer grosseri, Pinus armandii, etc.;Cercidiphyllum japonicum is the Class Ⅱ national protected species, Corylus chinensis,10