Study of community structure and distribution of mixed forest nеаr Nanwan Lake

Abstract

The community structure distribution of a forest that grows in the coastal zone is an important index for the diversity and sustainable development of riparian ecosystem and is also an important basis for the production of forest land management. In order to understand the ecological function of the riparian zone of Nanwan Lake (Xinyang City, Henan Province, China), the growth status of the forest in the downstream of the reservoir was investigated. The results of the study indicate that Pinus massoniana Lamb and Pistacia chinensis Bunge are the predominant species in the coastal zone. There is a gradual decrease in the representation of Pinus massoniana Lamb in this community. Lower story of Quercus dentate Thunb. and Pistacia chinensis Bunge demonstrates significant potential to replace the upper story. The tree structure characteristics (DBH - diameter of a tree trunk at breast high (1,3 m), tree height and crown width) were recorded at each experimental plot. The tree structure characteristics conform the inverted "J" distribution and the linear relationship between the DBH and tree height in the foreststand (can be well described by using Richard model equation), the model equation is H=1.3+20.095 (1–e-0.090D)1.765. In the absence of anthropogenic accidents or natural extremes, the forest lands near Nanwan Lake could effectively use environmental benefits for a long time. In order to improve the level of forest management in mixed forests in these areas, it is suggested to closely monitor the growth status of trees, cut dead or poor growing Pinus massoniana Lamb, and prevent the occurrence of forest fires.