草业学报2018，Vol.27Issue(2)：15-25,11.DOI:10.11686/cyxb2017159
不同生态恢复措施下宁夏黄土丘陵区典型草原植物群落数量分类和演替
Floristic quantitative classification and successional characteristics of typical grassland under different ecological restoration methods in the Loess Hilly Region of Ningxia
摘要
Abstract
Restoration measures strongly influence vegetation communities.To design effective restoration measures for the Loess Hilly Region,it is important to classify the flora and study the succession of degraded grassland plant communities on the typical steppe in Ningxia.In this study,we explored the relationship between the plant succession process and soil factors under three ecological restoration measures (enclosure,contour trench,and fish-scale pits) implemented for 0 (1),3,6,10 and 15 years by using Two Indicators Species Analysis (TWINSPAN) combined with a detrended correspondence analysis (DCA).The main results were as follows:(1) According to the TWINSPAN-DCA,the vegetation in the study plot was divided into eight communities.(2) With increasing exclosure time,the vegetation succession sequence was as follows:Stipa bungeana + Thymus mongolicus communities→S.bungeana + Stipa grandis communities→ T.mongolicus + S.bungeana communities→S.bungeana + S.grandis communities→S.bungeana + Artem isia sacrorum communities.The succession process from 1 to 15 years in the contour trench grassland was as follows:Astragalus adsurgens + Pennisetum flaccidum communities→Poa annua + Leym us secalinus communities→S.bungeana + T.mongolicus communities→T.mongolicus+L.secalinus communities→S.bungeana+S.grandis communities.The succession process from 1 to 15 years in the fish-scale pits grassland was as follows:A.adsurgens +P.flaccidurn communities→P.annua+S.bungeana communities→S.bungeana+T.mongolicus communities→T.mongolicus+S.bungeana communities.In the contour trench grassland and the fish-scale pits grassland,the trend in the dominant vegetation type over time was rhizome type-sparse type-dense cluster type,but there were also non-linear or spiral changes.The coverage of the plant community and aboveground biomass increased over time under all three restoration measures,and the growth rate was fastest in enclosed grassland and slowest in the fish-scale pits grassland.(3) The results of a detrended canonical correspondence analysis indicated that soil bulk density,organic matter,fungi,total phosphorus,and protease activity are the main soil factors affecting the vegetation communities in this area.关键词
典型草原/生态恢复/数量分类/演替序列/DCCA排序Key words
typical steppe/ecological restoration/numerical classification/succession process/detrended canonical correspondence analysis ordination引用本文复制引用
贾希洋,马红彬,周瑶,张蕊,宿婷婷,张双乔,张俊..不同生态恢复措施下宁夏黄土丘陵区典型草原植物群落数量分类和演替[J].草业学报,2018,27(2):15-25,11.基金项目
国家自然科学基金项目(31460632,31360582)和中国科学院“西部之光”人才培养引进计划项目(XAB2015A10)资助. （31460632,31360582）
