空气CO_2体积分数升高对稻麦根系活力及其VA菌根侵染率的影响  

Effects of free-air CO_2 enrichment on root vigor and infection rates of VAmycorrhiza in wheat and rice

作　　者：史奕[1] 李杨[1] 周全来[1] 朱建国[2] 

机构地区：[1]中国科学院沈阳应用生态研究所陆地生态过程重点实验室,辽宁沈阳110016 [2]中国科学院南京土壤研究所土壤与农业可持续利用国家重点实验室,江苏南京210008

出　　处：《生态环境》2004年第4期480-482,492,共4页Ecology and Environmnet

基　　金：国家自然科学基金项目(40271111;40231003;40110817);中国科学院知识创新重要方向项目(KZCX-2-408;SCXMS0302)

摘　　要：利用无锡市安镇的FACE研究平台,在施常规氮量和低氮量的条件下,研究CO2体积分数升高对稻麦轮作系统水稻和小麦根系活力及其VA菌根侵染率的影响。结果表明,在常氮和低氮条件下,FACE处理对小麦和水稻根系活力都有促进作用,并使小麦VA菌根侵染率在拔节期和孕穗期有增加趋势,小麦根系活力和VA菌根侵染率有正相关关系。施N量不足对作物根系生长和活力有一定影响,可以被CO2体积分数升高的影响所补偿。Using free-air CO_2enrichment (FACE) research site in Anzhen of Wuxi, China, the effects of CO-2 enrichment on root vigor and infection rates of VA mycorrhiza in wheat and rice were studied under normal and low nitrogen fertilization. The results showed that elevated CO_2 concentration stimulated root vigor in wheat and rice and increased infection rates of VA mycorrhiza during wheat jointing and booting stages under normal and low nitrogen fertilization. Infection rates of VA mycorrhiza were correlated significantly with root vigor in wheat. Root vigor and growth decreased under low nitrogen fertilization, but it was compensated by the effects of CO_2 enrichment.

关 键 词：空气二氧化碳体积分数 稻麦轮作 根系活力 VA菌根 侵染率 

分 类 号：X171.5[环境科学与工程—环境科学]