Effects of Environment on Riparian Plant Community in the Inflow Branches of the Hanfeng Lake
The riparian zone regulates the flux of energy,nutrients,and biotic interchange between aquatic and ter-restrial ecosystems and provides many important ecological services critical to maintaining watershed productivity and sustainability.This area of research has attracted increasing attention among ecologists and environmental sci-entists both at home and abroad.In this study the riparian plant communities and riparian habitats were investigated across the four rivers flowing into Hanfeng Lake (Nanhe,Taoxi,Toudao,and Donghe)and the distribution of the plant communities and their relationship with environmental factors were analyzed.The study will provide scientific data for the management and restoration of the riparian ecosystems.Twelve transects along the longitudinal gradient from upstream to downstream were established in the four rivers and three study areas along the lateral gradient from the river bank to the adjacent upland were established for each transect (at 0-1 m,2-5 m and 6 -10 m above water level).The height,cover and biomass above ground of all herbaceous plants were measured in a 1 m x 1 m plot of each study area in June 2013.The cover and branch diameter of the trees and shrubs were determined in a 5 m (vertical)x10 m (horizontal)plot of each study area.The soil bulk density of each plot was measured using the cutting-ring method and soil cores (0-20 cm)for each plot were collected for measurement of moisture,pH, organic matter,available nitrogen,available phosphorous and available potassium in the laboratory.A total of 171 species of vascular plants belonging to 155 genera and 69 families were observed with high species richness of As-teraceae(19 species),Gramineae(16 species)and Rosaceae(9 species),accounting for 11.1%,9.4% and 5.3% of total plant species.The plant communities were mainly composed of herbs (68.4%) and shrubs (12.9%)in terms of biotype.The mean values of fresh weight,cover and height of the herbaceous plants were (1 951.6 ±3 076.2)g/m2,(79.9 ±34.7 )%and (34.2 ±18.3)cm.Plant species with high importance values were Pterocarya stenoptera,Eleusine indica and Pogonatherum paniceum.The mean values of soil density,pH,or-ganic matter,available nitrogen,available phosphorus and available potassium were (1.32 ±0.19)g/cm3,(7.91 ±0.38 ),(18.22 ±21.45 )g/kg,(60.58 ±68.67 ) mg/kg,(6.51 ±5.21 ) mg/kg and (59.42 ± 34.33)mg/kg,respectively.Canonical correspondence analysis (CCA)revealed that the main environmental var-iables affecting the importance value of species were elevation and soil organic matter.
Hanfeng Lakeriparian zoneplant communityeffects of environment
国家科技期刊平台
NSTL
万方数据
维普
