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毛乌素沙地玉米不同种植年限砒砂岩与沙复配土壤有机质与全氮的关系
张海欧1,2, 王欢元1, 孙婴婴1
1.陕西省土地工程建设集团有限责任公司 陕西地建土地工程技术研究院有限责任公司 国土资源部退化及未利用土地整治工程重点实验室 陕西省土地整治工程技术研究中心, 陕西 西安 710075;2.西安理工大学 水利水电学院, 陕西 西安 710048
摘要:
[目的]研究毛乌素沙地不同种植年限下不同比例砒砂岩与沙复配土壤碳氮变化特征,分析新造复配成土结构能否持续稳定发育。[方法]根据2013-2016年田间小区试验数据,对不同种植年限下3种比例砒砂岩与沙复配土壤有机质和全氮时空变化特征及两者间的关系进行研究。[结果]①不同比例复配土壤有机质和全氮含量均随着作物种植年限的增加而呈现稳定上升趋势;②4 a间3种复配土壤有机质和全氮含量均表现为:1:1 > 1:2 > 1:5,各自相对于2013年变化差异极显著(p<0.01);③不同种植年限下3种比例复配土壤有机质与全氮均呈现显著正相关,相关系数分别为0.860,0.891 7,0.737 6。[结论]复配比例和种植年限是影响新造土壤有机质和全氮含量的重要因子。
关键词:  新造土壤  种植年限  碳氮关系  毛乌素沙地  玉米  砒砂岩
DOI:10.13961/j.cnki.stbctb.2019.02.038
分类号:S153.6
基金项目:陕西省土地整治重点实验室开放基金项目“不同未利用地有机重构土体微形态特征以及质量演变规律”(2018-JC15),“毛乌素沙地砒砂岩与沙复配土的团聚作用及稳定性机理研究”(2018-JC18)
Relationship Between Soil Organic Matter and Total Nitrogen in Compound Soil of Arsenic Sandstone and Sand with Number of Maize Cultivation Years in Mu Us Sand Land
Zhang Haiou1,2, Wang Huanyuan1, Sun Yingying1
1.Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources, Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Xi'an, Shaanxi 710075, China;2.Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, China
Abstract:
[Objective] The purposes of this paper are to evaluate the characteristics of carbon and nitrogen in soils with different proportion of arsenic sandstone and sand under different cultivation years in Mu Us sand land, and to determine whether the newly-formed soil structure can develop continuously and steadily.[Methods] Based on the data of field plots from 2013 to 2016, the temporal and spatial variation characteristics of soil organic matter and total nitrogen and the relationship between the three proportions of sandstone and sand in different planting years were studied.[Results] ① The soil organic matter and total nitrogen content of different proportions showed a steady upward trend with the number of crop cultivation years; ② In the four years, the soil organic matter and total nitrogen content of the three compound soils showed 1:1 > 1:2 > 1:5, and the difference was significantly different from that in 2013(p < 0.01). ③ There were significant positive correlations between soil organic matter and total nitrogen in the three proportions under different planting years. The correlation coefficients were 0.86, 0.89 and 0.74.[Conclusion] Proportions and cultivation years are important factors affecting the contents of organic matter and total nitrogen in newly constructed soil.
Key words:  newly constructed soil  cultivation years  carbon and nitrogen relationship  Mu Us sand land  arsenic sandstone