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全球变暖提高了温带森林生态系统植物的生产力,但对亚热带森林生产力的影响仍然不清楚。由于亚热带森林植物的碳储量巨大,因此了解全球变暖对亚热带森林植物生长的影响至关重要。采用加热电缆模拟土壤增温(+5℃),探讨中亚热带森林几种主要草本植物和木本植物的生长及其生物量分配格局对温度升高的响应。结果表明:增温显著增加五节芒(Miscanthus floridulus)、山油麻(Trema dielsiana)和东南野桐(Mallotus lianus)的高度,但黑莎草(Gahnia tristis)高度显著降低。增温显著增加木本植物的地上、地下和总生物量,而草本植物的地上、地下和总生物量均显著降低。增温对整个群落的地上和地下部分生物量分配模式无显著影响,但木本植物总生物量在各器官之间分配随温度发生改变,增温显著提高木本植物枝生物量比(BMR),降低干生物量比(SMR),而叶生物量比(LMR)和根生物量比(RMR)无显著影响,但显著降低了细根占总根系生物量比率。结果表明木本植物能够通过调节生物量分配模式应对未来全球气候变暖。
Global warming increases the productivity of plants in temperate forest ecosystems, but the impact on subtropical forest productivity remains unclear. As carbon stocks in subtropical forest plants are huge, understanding the effects of global warming on the growth of subtropical forest plants is crucial. The warming cable was used to simulate soil temperature increase (+ 5 ℃) to investigate the effects of temperature on the growth and biomass allocation pattern of several main herbs and woody plants in the subtropical forest. The results showed that warming significantly increased the height of Miscanthus floridulus, Trema dielsiana and Mallotus lianus, but the height of Gahnia tristis decreased significantly. Increasing temperature significantly increased the above-ground, underground and total biomass of woody plants, while the aboveground, underground and total biomass of herbs were significantly reduced. There was no significant effect of warming on the pattern of biomass allocation above and below ground in the whole community. However, the distribution of total biomass of woody plants varied with temperature and the temperature increased markedly the BMR, , Lower dry biomass ratio (SMR), while leaf biomass ratio (RMR) and root biomass ratio (RMR) had no significant effect, but significantly reduced the ratio of fine root to total root biomass. The results show that woody plants can cope with future global warming by adjusting the biomass allocation pattern.