水稻生长及其体内C、N、P组成对开放式空气CO2浓度增高和N、P施肥的响应

摘要/Abstract

摘要： 采用FACE(Free Air Carbon-dioxide Enrichment)技术,研究了不同N、P施肥水平下,水稻分蘖期、拔节期、抽穗期和成熟期根、茎、叶、穗生长,C/N比,N、P含量及N、P吸收对大气CO₂浓度升高的响应.结果表明,高CO₂促进水稻茎、穗和根的生长.增加分蘖期叶干重,对拔节期、抽穗期和成熟期叶干重没有显著增加.降低茎、叶N含量;增加抽穗期穗N含量,降低成熟期穗N含量;对分蘖期根N含量影响不显著,而降低拔节期、抽穗期和成熟期根N含量.增加拔节期、抽穗期和成熟期叶P含量,对茎、穗、根P含量影响不显著.水稻各组织C含量变化不显著.C/N比增加.显著增加水稻地上部分P吸收;增加N吸收,但没有统计显著性.N、P施用对水稻各组织生物量没有显著影响.高N(HN)比低N(LN)增加组织中N含量,而不同P肥水平间未表现出明显差异.高N条件下高CO₂增加水稻成熟期地下部分/地上部分比.文中还讨论了高CO₂对N、P含量及地下部分/地上部分比的影响机制.

Abstract: FACE (Free-air Carbon Dioxide Enrichment) was used to study the effects of elevated CO₂ on rice (Oryza sativa) growth,tissue C/N,Nand Pconcentration and uptake at different development stages under two Nand two Plevels. Results showed that elevated CO₂ increased dry matter accumulation in rice stem, ear and root. Leaf dry matter was increased at tillering stage and no significant effect was found at jointing, heading and ripening stages. Nconcentration of stem and leaf was decreased. Ear Nconcentration at heading stage was increased but was decreased at ripening stage. No significant effect was found on root Nconcentration at tillering stage but root Nconcentration at jointing, heading and ripening was decreased. Leaf Pconcentration at jointing, heading and ripening was increased but no significant effect was found on Pconcentration in stem, ear and root. Ccontent in various tissues changed unremarkably and the ratio of Cover N (C/N) was increased. Elevated CO₂ significantly increased Puptake in aboveground tissues; and increased Nuptake, but the difference was not statistically significant. Nand Pfertilization had no significant effect on various tissue dry biomass. Tissue Ncontent at higher Nfertilization was higher than at lower Nfertilization but no such effect of Pfertilization on tissue Pcontent was found. At higher Nfertilization, elevated CO₂ increased the ratio of below-ground biomass over above-ground biomass at ripening stage. Possible reasons are discussed for the differences of tissue Nand Pcontent and the ratio of below-ground biomass over above-ground biomass between elevated and ambient atmospheric CO₂ concentrations.

中图分类号:

S511

谢祖彬, 朱建国, 张雅丽, 马红亮, 刘钢, 韩勇, 曾青, 蔡祖聪. 水稻生长及其体内C、N、P组成对开放式空气CO₂浓度增高和N、P施肥的响应[J]. 应用生态学报, 2002, (10): 1223-1230.

XIE Zubin, ZHU Jianguo, ZHANG Yali, MA Hongliang, LIU Gang, HAN Yong, ZENG Qing and CAI Zucong . [J]. Chinese Journal of Applied Ecology, 2002, (10): 1223-1230.

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水稻生长及其体内C、N、P组成对开放式空气CO₂浓度增高和N、P施肥的响应

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