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

发布时间：2018-06-17 05:38

本文选题：土地整治 + 新增耕地　；参考：《南方农业学报》2016年06期

【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。
[Abstract]:[objective] taking the gully region of Weibei Loess Plateau as an example, to study the soil nutrient characteristics of the new cultivated land in land regulation, and to provide a reference for judging whether the new cultivated land can be used for sustainable use. [methods] White water located in the gully region of Weibei Loess Plateau. The new cultivated land in Pucheng and Fuping counties was studied. Every 20 ha of newly increased cultivated land was used as a sampling unit to collect 030 cm soil layer, 30 soil samples were collected, and soil organic matter and total nitrogen were determined. The content of available phosphorus and available potassium and soil texture were analyzed. [results] the soil texture of the new cultivated land in the gully region of Weibei Loess Plateau was silt loam, organic matter and total nitrogen. The average contents of available phosphorus and available potassium were 16.69 g / kg ~ 0.67 g / kg ~ (-1) mg/kg and 173.28 mg / kg 路kg ~ (-1), respectively. The content of available phosphorus was expressed in Fuping County, Pucheng County, Baishui County. The results of correlation analysis showed that there was a significant positive correlation between soil organic matter content and total nitrogen content (P0.05N), and a very significant positive correlation between soil organic matter content and available phosphorus content, and a very significant positive correlation between available potassium content and available phosphorus content (P 0.01), and between available phosphorus content and available potassium content. Except for total nitrogen, soil nutrient content was positively correlated with sand content, negatively correlated with clay and silt content. According to the nutrient grading index of Loess Plateau, the soil nutrients of the newly increased cultivated land in the gully region of Weibei Loess Plateau were evaluated. The content of soil organic matter was in the middle level, and the total nitrogen content was low. [conclusion] there are regional differences in soil nutrients of newly cultivated land in different sampling counties in the gully region of Weibei Loess Plateau. The content of soil organic matter has great influence on soil nutrient content.
【作者单位】：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;西北农林科技大学资源环境学院;
【基金】：国家科技支撑计划项目(2014BAL01B03)
【分类号】：S158

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