摘要
试验以超级稻沈农9816和普通稻秋光为试材,采用盆栽方法,模拟砷污染农田,设置4种砷胁迫浓度,即0、20、40和60 mg kg-1。砷以Na3AsO4·12H2O形式加入。试验结果表明:当砷胁迫浓度达到40 mg kg-1以上时,超级稻硝酸还原酶活性、脯氨酸、可溶性蛋白含量显著高于普通稻(P<0.05);灌浆期超级稻根系利用可溶性糖进行渗透调节的能力比普通稻强;单株有效穗数的增加是超级稻高产的基础,在相同砷胁迫浓度下,超级稻的有效穗数分别是普通稻的121.90%、122.25%、139.05%和133.22%。
Taking Zhengzhou as the research object, the diversity theory and measure method were applied to the research on pedodiversity and land use diversity. Based on TM image in 2004 and 2009 whose land use types were classified while the soil vector data was used based on the second national survey, the preliminary analysis and the quantitative research of the diversity between soil and land use in both composition distributions and spatial distributions were conducted and discussed the relationship between soils and land use types. Results showed that soil composition with composition diversity index （0.776） in Zhengzhou was relatively complicated and the composition diversity index of land use was increased from 0.610 in 2004 to 0.651 in 2009. The spatial diversity index of the same soil or land use in Zhengzhou had similar differentiation laws in different grid scales with the most discrete space distribution types of soils for sandy soil and cultivated land. In the three kinds of space grid scales with the propelling of the study period, the connection index between urban construction land, countryside residential area and industry and mining land and typical types of soils presented the increasing tendency in varying degrees.
出处
《土壤通报》
CAS
CSCD
北大核心
2013年第5期1192-1197,共6页
Chinese Journal of Soil Science
基金
辽宁省教育厅项目(L2011110)
教育部北方粳稻遗传育种重点实验室开放项目(2009005)资助
关键词
砷
超级稻
根系
碳氮代谢产物
产量
Shannon entropy
Pedodiversity
Land use diversity
Zhengzhou
Connection index
