开放式空气CO_2浓度升高对水稻/小麦轮作土壤速效钾的影响  

Effect of free air carbon-dioxide enrichment on soil available K in rice-wheat rotation system

作　　者：马红亮[1] 朱建国[2] 谢祖彬[2] 刘钢[2] 曾青[2] 

机构地区：[1]福建省亚热带资源与环境重点实验室,福建师范大学地理科学学院,福建福州350007 [2]土壤与农业可持续发展国家重点实验室,中国科学院南京土壤研究所,江苏南京210008

出　　处：《植物营养与肥料学报》2009年第3期607-612,共6页Journal of Plant Nutrition and Fertilizers

基　　金：国家"973"项目(2002CB714003);中国科学院知识创新重要方向项目(KZCX32SW2440);国家自然科学基金项目(40571157);福建省青年科技人才创新项目(2007F3020);福建省教育厅B类项目(JB07076)资助

摘　　要：采用FACE(Free air carbon dioxide enrichment)技术,研究了不同施氮水平下,大气CO_2浓度升高对水稻/小麦轮作土壤速效钾的影响。结果表明,相对于对照处理,在不同氮水平下CO_2浓度升高使作物生物量增加,导致作物生长季对土壤钾的吸收增加,但并没有降低作物主要生长期土壤(0—5、5—15 cm土层)速效钾的含量;CO_2浓度升高使土壤速效钾增加的幅度在作物根际达6.3%～22.3%,在行间达3.7%～11.2%,且土壤速效钾增加的幅度在小麦季大于水稻季。表明根系对土壤速效钾的影响很大,因此,短期内土壤钾含量不会成为限制因素而影响作物对高CO_2浓度的响应,反而会增加土壤钾的有效性。但在土壤肥力较低的土壤上可能会产生消极影响。The effect of elevated atmospheric CO2 on soil available K in paddy soil through FACE（Free air carbon dioxide enrichment）system was studied by comparing the contents of soil available K at different growth stages of the rice-wheat rotation system. The results show that compared to the ambient air treatment, K uptakes of the crops are increased by elevated CO2 due to significant increase of their biomass, while the contents of soil available K of both upper soil layer （0- 5 cm） and lower soil layer （5-15 cm） are not decreased. The increase magnitudes of soil available K due to elevated CO2 are 6.3 % - 22.3 % in root rhizosphere and 3.7 % - 11.2 % between crops lines. The increment of soil available K around wheat roots is higher than that of rice. These results indicate that root increased by elevated CO2 is beneficial to soil available K for crops, and K is not a limited factor for response of crops to elevated CO2 in a short time. However, this phenomenon may have negative effects for soils with poor fertility.

关 键 词：CO2浓度升高 水稻土 水稻 小麦 速效钾 

分 类 号：S511[农业科学—作物学] S512.1