生态学报2018，Vol.38Issue(9)：3046-3058,13.DOI:10.5846/stxb201703140427
不同水分处理和密度配置对牛鞭草与狗牙根生长与种间竞争的影响
Effects of different water conditions and plant density on the growth and interspecific competition of Hemarthria compressa and Cynodon dactylon
摘要
Abstract
To restore the degraded grass vegetation and reveal the best ratio of grass species for artificial restoration of the riparian zone of the Three Gorges Reservoir area,the local dominant species,Hemarthria compressa (H) and Cynodon dactylon (C) were used to investigate the growth and intraspecific and interspecific competition under different water conditions.On April 29,2016,a pot experiment was conducted using a replacement series design in which H.compressa and C.dactylon were planted at seven ratios (H0C12,H2C10,H4C8,H6C6,H8C4,H10C2,and H12C0) under three water treatments,including normal growth water condition (CK),flooding at 10 cm above the soil surface (SF) and flooding at 2 m above the soil surface (TF).Results showed that:(1) Regardless of the planting being a monoculture or a combination of the two species,biomass production of both species decreased under water stress.H.compressa was more sensitive to water stress than C.dactylon;(2) There was a density-dependent effect on the growth of both species and this effect was stronger on C.dactylon;(3) Under all three water treatments,the relative yield total (RYT) was greater than 1 when both species were planted.Under CK,the two species showed a competitive relationship,whereas under SF and TF,they were facilitated by each other.Taking maximizing biomass production,the root ∶shoot ratio,and the competitive ability of the species into consideration,we suggest that under CK,the best ratio for planting of H.compressa and C.dactylon is 2∶10,whereas under SF and TF,the best ratio is 8∶4.These results provide a baseline reference for vegetation restoration and reconstruction in the riparian zone of the Three Gorges Reservoir area,and provide a theoretical reference for the establishment of artificial grass vegetation in similar areas.关键词
牛鞭草/狗牙根/生长/生物量分配/种间竞争/水淹/密度配置Key words
Hemarthria compressa/Cynodon dactylon/growth/biomass allocation/interspecific competition/water stress/density引用本文复制引用
李晓雪,贺燕燕,杨文航,王朝英,燕江伟,崔振,李昌晓..不同水分处理和密度配置对牛鞭草与狗牙根生长与种间竞争的影响[J].生态学报,2018,38(9):3046-3058,13.基金项目
重庆市林业重点科技攻关项目(渝林科研2016-8) （渝林科研2016-8）
国家国际科技合作专项(2015DFA90900) （2015DFA90900）
中央财政林业科技推广示范项目(渝林科推[2017-12]) （渝林科推[2017-12]）
