Chin J Plan Ecolo ›› 1998, Vol. 22 ›› Issue (3): 202-213.

• Research Articles • Previous Articles     Next Articles

The Hydro-physiological Characteristics of Major Plant Species of the Forest Ecosystem in the Warm Temperate Zone of Northern China

Li Haitao Chen Lingzhi   

  • Published:1998-03-10
  • Contact: Yang Yuefei

Abstract: In this paper, a pressure-bomb technique was applied to measure the six physiological indices of ten main plant species in the forest ecosystem of warm temperate zone during the period from April to October of 1994. They were minimum water status of leaf (Ψmin), maximum osmotic potential at saturation point (Ψs sat), osmotic potential at incipient plasmolysis (Ψs tlp), relative water content at incipient plasmolysis (RWC), relative osmotic water content at incipient plasmolysis (ROWC), relative content of apoplectic water(AWC). The plant species under study were Quercus liaotungensis, Betula dahurica, Acer mono, Fraxinus rhychophylla, Abelia biflora, Pinus tabulaeformis, Prunus armeniaca var ansu, Prunus davidiana, Ulmus macrocarpa, Syringa pekinensis. The results were as follows: 1)The seasonal change of Ψmin showed the tendency similar to that of soil moisture in all the above tree species. 2)Ψs sat and Ψs tlp of the species continuously decreased in the course of the growth season, and were related to the phenological rhythm of the species. 3) The seasonal variations in ROWCtlp and RWCtlp, generally, tended to be similar for the different species in the whole growing season. In the end of May those two indices reached the maximum and then declined accompanying the maturity of leaves and twigs. 4)AWC of the species increased in growing season.