大气CO_2浓度升高对稻麦根系周围土壤C、P、K的影响  

Effects of elevated CO_2 on soil C,P and K around the roots of rice and wheat

作　　者：马红亮[1] 徐一杰[1] 朱建国[2] 吴艳红[1] 谢祖彬[2] 刘钢[2] 高人[1] 

机构地区：[1]福建省亚热带资源与环境重点实验室,湿润亚热带生态-地理过程省部共建教育部重点实验室,福建师范大学地理科学学院,福州350007 [2]土壤与农业可持续发展国家重点实验室,中科院南京土壤研究所,南京210008

出　　处：《生态学报》2009年第9期4949-4955,共7页Acta Ecologica Sinica

基　　金：国家"973"资助项目(2002CB714003);中国科学院知识创新重要方向资助项目(KZCX32SW2440);国家自然科学基金资助项目(40571157);福建省青年科技人才创新资助项目(2007F3020);福建省教育厅B类资助项目(JB07076);地理学实验教学示范中心课外开放实验资助项目

摘　　要：利用FACE(free air carbon dioxide enrichment)技术平台,在两种氮肥施用(低氮,LN和常规氮,NN)水平下,研究CO2浓度升高对水稻和小麦收获后根际和非根际土壤可溶性碳、有机磷、速效磷和速效钾的影响。结果表明,相对于对照CO2浓度处理,高CO2浓度处理在显著增加作物生物量的前提下,土壤速效磷和速效钾不但没有降低反而增加,增加幅度小麦季大于水稻季,根际大于非根际;水稻季土壤可溶性碳含量增加,且NN水平下水稻和小麦季进入土壤的可溶性碳增加,导致土壤有机磷降低幅度低于LN水平,且水稻季根际土壤大于非根际土壤,有机磷的降低是保证有效磷升高的一个重要因素,增加氮肥施用将有利于土壤有机磷的增加,对维持土壤磷的供给有积极作用,有利于作物对高CO浓度的持续响应。The present study is conducted to determine effects of elevated atmospheric CO2 concentration on soil soluble C, available P and K, and organic P in rhizosphere and non-rhizosphere after crops harvested under two N levels with FACE （free air carbon dioxide enrichment） systems. The results showed that compared with ambient CO2, elevated CO2 did not decrease soil available P and K but increase them with increased biomass of rice and wheat and soil available P and K were increased more in wheat season than in rice one, more in root rhizosphere than in non-rhizosphere. Soil soluble C was increased by elevated CO2 and more carbon input to soil under NN treatment resulted in a more decrease of soil organic P at LN than at NN, in rhizosphere than in non-rhizosphere of flee. The decrease of organic P played an important role in the increase of soil available P. More N application, for example, NN treatment was beneficial to increase of soil organic P and then perform a positive function in keeping the soil P available, which could insure the continuously response of crops to elevated CO2.

关 键 词：CO2浓度升高 N水平 根际 可溶性碳 速效P 有机P 速效K 

分 类 号：S158[农业科学—土壤学]