摘要
采用开顶式生长室(open-top chamber,OTC),研究了川西亚高山采伐迹地草坡群落物候、群落结构和地上生物量对模拟增温的初期响应。生长季中OTC内日平均气温较对照(CK)增加2.2℃,5cm土壤温度增加0.8℃。和CK相比,建群种牛尾蒿和糙野青茅萌动期、花蕾期和花期均显著提前,而枯黄期显著推迟。群落各种群高度、密度和重要值增加、减少或无影响,生物多样性指数有所下降,群落结构发生一定变化。OTC内糙野青茅和牛尾蒿地上生物量较CK分别增加46.3%和42.0%。中华羊茅和其它草类植物地上生物量有所下降,但差异不显著。地上总生物量增加34.0%。
The responses of phenology, community structure and above-ground biomass of grass community in clear-cutting land of sub-alpine regions in Western Sichuan to simulated global warming were studied by using the open-top chamber （OTC） method. The results were shown as follows： mean air temperature was 2.2 ℃ higher in the OTC than in the control plot （CK） throughout the growing season and there was 0.8 ℃ difference in daily mean soil temperature at 5 cm below the soil surface between the OTC and the CK. Compared with those in the CK, constructive species （Artemisia subdigitata and Deyeuxia scabrescens） in the OTC showed earlier sprouting, pre-flowering bud, and florescence. However, they had later withering in the OTC than in the CK. Height, density and important value of each plant population responded differently （increase, decrease or no effects） to warming. The biodiversity index was slightly lower in the OTC than in the CK. Some changes in the community structure were observed. The above-ground biomass of Deyeuxia scabrescens and Artemisia subdigitata in the OTC increased by 46.3% and 42.3%, respectively. However, the above-ground biomass of Festuca sinensis and the other herbs in the OTC decreased, but not significant. Compared with those under ambient temperature, total above-ground biomass increased by 34.0% under elevated temperature.
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出处
《生态学报》
CAS
CSCD
北大核心
2009年第6期2899-2905,共7页
Acta Ecologica Sinica
基金
国家自然科学基金重大资助项目(90511008,90202010)
四川省科技攻关资助项目(05SG023-009)
上海市城市化生态过程和生态恢复重点实验室开放基金资助项目(20070010)
