| 渭北黄土高原沟壑区土地整治中新增耕地土壤养分现状分析 |
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| 引用本文： | 魏样,韩霁昌,杜宜春,王欢元,马增辉.渭北黄土高原沟壑区土地整治中新增耕地土壤养分现状分析[J].南方农业学报,2016(6):906-910. |
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| 作者姓名： | 魏样 韩霁昌 杜宜春 王欢元 马增辉 |
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| 作者单位： | 1. 陕西省土地工程建设集团有限责任公司/国土资源部退化及未利用土地整治工程重点实验室，西安 710075; 西北农林科技大学 资源环境学院，陕西 杨凌 712100;2. 陕西省土地工程建设集团有限责任公司/国土资源部退化及未利用土地整治工程重点实验室,西安,710075 |
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| 基金项目： | 国家科技支撑计划项目(2014BAL01B03) |
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| 摘 要： | 【目的】以渭北黄土高原沟壑区为例,研究土地整治中新增耕地的土壤养分特征,为判别新增耕地能否实现可持续利用提供参考。【方法】以位于渭北黄土高原沟壑区的白水、蒲城和富平3县新增耕地为研究对象,每20 ha新增耕地作为一个采样单元,采集0~30 cm耕层土壤,共采集土样30个,测定土壤有机质、全氮、有效磷和速效钾含量及土样质地等指标,分析土壤养分状况。【结果】渭北黄土高原沟壑区新增耕地土壤质地均为粉壤土,有机质、全氮、有效磷及速效钾平均含量分别为16.69 g/kg、0.67 g/kg、15.79 mg/kg和173.28 mg/kg;有机质和速效钾含量表现为白水县富平县蒲城县;全氮含量表现为蒲城县白水县=富平县;有效磷含量表现为白水县蒲城县富平县。相关性分析结果表明,土壤有机质含量与全氮含量呈显著正相关(P0.05),与有效磷、速效钾含量呈极显著正相关(P0.01,下同);有效磷含量与速效钾含量呈极显著正相关。除全氮外,其他土壤养分含量与砂粒含量呈正相关,与黏粒和粉粒含量呈负相关。参照黄土高原养分分级指标对渭北黄土高原沟壑区新增耕地的土壤养分进行分级评价,土壤有机质含量整体处于中等水平,全氮含量较低,有效磷和速效钾含量较高。【结论】渭北黄土高原沟壑区不同采样县新增耕地土壤养分存在地区差异性。土壤有机质含量对土壤养分含量影响较大。
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| 关 键 词： | 土地整治 新增耕地 土壤养分 渭北黄土高原沟壑区 |
Soil nutrients of newly-increased farmland in the process of land consolidation in Weibei loess plateau gully region |
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| Abstract: | Objective]The soil nutrients of newly-increased farmland in Weibei loess plateau gully region were studied , in order to provide a reference for determining whether new arable land would be used sustainably. Method]With every 20 ha newly-increased farmland as a sampling unit, a total of 30 soil samples were collected from 0-30 cm topsoil in Baishui county, Pucheng county and Fuping county which located in Weibei loess plateau gully region. Then the organic matter, total N, available P, available K and soil texture of soil samples were determined to analyze soil nutrient status. Result]The results showed that, the soil texture was silt loam, the contents of organic matter, total N, available P and available K in soil were 16.69 g/kg, 0.67 g/kg, 15.79 mg/kg and 173.28 mg/kg, respectively. Based on the contents of organic matter and available K, three counties were ordered, as follows: Baishui county>Fuping county>Pucheng county; Based on con-tents of total N, three counties were ordered, as follows: Pucheng county>Baishui county=Fuping county; Based on con-tents of total N and available P, three counties were ordered, as follows: Baishui county>Pucheng county>Fuping county. Furthermore, the correlation analysis showed that, the content of soil organic matter was significantly positively correlated with content of total N(P<0.05), and extremely significantly positively correlated with contents of available P and K(P<0.01,the same below). The content of available P was extremely significantly positively correlated with content of available K. Except total N, the contents of soil nutrients were positively correlated with sand content, and negatively correlated with contents of clay and silt. According to the grading standard of soil nutrients in loess plateau , the soil organic matter content of newly-increased farmland in Weibei loess plateau gully region was at a middle level , the content of total N was low, the contents of available P and K were high. Conclusion]In Weibei loess plateau gully region, there are regional differences in soil nutrients between different countries. And the soil organic matter content has a greater impact on soil nutrient content. |
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| Keywords: | soil consolidation newly-increased farmland soil nutrients Weibei loess plateau gully region |
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