CO2浓度倍增和土壤干旱对两种幼龄沙生灌木碳分配的影响
收稿日期: 2003-06-12
录用日期: 2003-06-12
网络出版日期: 2005-03-10
基金资助
中国科学院创新工程项目(KZCXI-SW-01-12);国家自然科学基金项目(40231018)
INTERACIVE EFFECTS OF DOUBLED ATMOSPHERIC CO2 CONCENTRATIONS AND SOIL DROUGHT ON WHOLE PLANT CARBON ALLOCATION IN TWO DOMINANT DESERT SHRUBS
Received date: 2003-06-12
Accepted date: 2003-06-12
Online published: 2005-03-10
利用大型环境生长箱研究了两种幼龄沙地优势灌木柠条 (Caraganaintermedia) 和羊柴 (Hedysarummon golicum) 对CO2 浓度倍增和土壤干旱交互作用的响应。CO2 浓度倍增并没有改善两种沙生灌木叶片的水分状况, 而土壤干旱使叶片的相对含水量 (RWC) 显著降低。在土壤水分充足条件下, CO2 浓度倍增促进两种沙生灌木植株生长, 在干旱条件下则主要促进根的生长, 提高根冠比。土壤干旱显著减少了植株生物量, 但相对促进了根的生长, 特别是显著提高了羊柴的根冠比。CO2 倍增使稳定性碳同位素组分 (δ13 C) 降低, 但土壤干旱使之增加。两种沙生灌木叶片与根部的δ13 C值呈极显著线性关系, 羊柴的斜率大于柠条的, 表明前者叶片与根部在光合产物分配上具有较高的生态可塑性, 这和干旱条件下羊柴的根冠比增加相关联。羊柴的“源库”调节特性反映了对土壤水分胁迫具有较高的耐性。
许振柱, 周广胜, 肖春旺, 王玉辉 . CO2浓度倍增和土壤干旱对两种幼龄沙生灌木碳分配的影响[J]. 植物生态学报, 2005 , 29(2) : 281 -288 . DOI: 10.17521/cjpe.2005.0036
Atmospheric CO 2 concentrations are expected to double around the middle part of the 21 st century. Plant growth might be favored by CO 2 enrichment, but water limitation is a common stress for plant growth and productivity. At present, only a few studies have looked at the combined effects of CO 2 enrichment and drought on plant ecophysiology. This experiment was conducted to investigate the responses of two dominant desert shrubs, Caragana intermedia and Hedysarum mongolicum, in western China to the interaction of doubled CO 2 levels and soil drought in large environmental growth chambers (19 m 2). In this paper, we employed different methods, including allometry and carbon isotope discrimination, to examine the effects of water availability on carbon allocation and stable carbon isotope composition (δ 13 C) of the two desert shrubs under two CO 2 concentrations. The objectives included the following: 1) to investigate the effects of soil drought and CO 2 enrichment on plant biomass and δ 13 C; 2) to investigate the effects of soil drought and CO 2 enrichment on the allocation of dry matter and carbohydrates; and 3) to elucidate the adaptive strategies of C. intermedia and H. mongolicum to soil drought under doubled atmospheric CO 2 concentrations. Compared to ambient CO 2 concentrations, doubled CO 2 concentrations did not improve the leaf water status, but soil drought significantly reduced the leaf relative water content (RWC). Doubled CO 2 concentrations enhanced plant growth under well-watered conditions but increased root growth under drought conditions resulting in an increase in root to shoot ratios. Soil drought significantly reduced plant biomass and increased root to shoot ratios, especially for H. mongolicum. The δ 13 C values were reduced at doubled CO 2 concentrations but increased under drought conditions. By plotting the leaf δ 13 C values against the root δ 13 C values, it was possible to assess carbon allocation and incorporation into roots in relation to present biomass. There was a significant and linear relationship between leaf δ 13 C and root δ 13 C values, and the slope of H. mongolicum was greater than that of C. intermedia indicated a higher plasticity in the ability to change carbon allocation patterns. This resulted in higher root to shoot ratios in H. mongolicum under drought conditions. The results indicated that both C. intermedia and H. mongolicum had a higher tolerance to severe water deficits under doubled CO 2 conditions. Decreases in precipitation might accompany with future increases in atmospheric CO 2 concentrations in the region dominated by these two species, suggesting that distribution ranges of C. intermedia and H. mongolicum might be constrained. Our results suggest that H. mongolicum has a higher tolerance to environmental stress than C. intermedia. Future work should emphasize how to enhance the drought tolerance of plants in semiarid region under conditions of CO 2 enrichment.
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