旱作大田块风蚀物中有机质变化特征研究  

Research on the Variation of Organic Matters in the Dry Field Erosion

作　　者：陈健[1] 彭乾[2] 常春平[1] 苏振生[3] 梁剑[1] 

机构地区：[1]河北师范大学资源与环境科学学院河北省环境演变与生态建设重点实验室,河北石家庄050016 [2]南开大学环境科学与工程学院,天津300071 [3]河北师范大学附属民族学院,河北石家庄050016

出　　处：《河南农业科学》2011年第8期120-124,共5页Journal of Henan Agricultural Sciences

基　　金：河北省自然科学基金(D2008000183);河北师范大学博士基金资助项目

摘　　要：土壤有机质的含量与土壤肥力水平是密切相关的,通常在其他条件相同或近似的情况下,在一定含量范围内,有机质的含量与土壤肥力呈正相关。因此,对留茬地和翻耕地块沿盛行风向风沙流结构进行试验观测,分析风蚀物的有机质变化特征,结果表明,这两类农田风蚀物有机质含量在垂直高度上的变化均遵循线性规律变化,随高度增加,风蚀物中有机质含量增加;留茬地在20 cm高度内各集沙点风蚀物有机质特征值（B）均小于1,20~60 cm高度内大于1;翻耕地在各集沙点高度内B均小于1。因此,在河北坝上地区退耕林灌草地和耕地基本各自集中成片分布的情况下,留茬耕作仍是一种防治旱作大田块农田风蚀沙化的有效耕作措施。The content of soil organic matter and soil fertility levels are usually positively correlated in a certain range under the conditions of the similar circumstances.The sand flow structure along the prevailing wind in stubble and tillage land was tested,and the variation of the organic matter in erosion was analyzed.The results showed that the organic matter content in these two fields changed in the vertical direction following a linear law,and with the increase of height,the content of organic matter in the erosion increased.The characteristic value of erosion organic matter（B） at each set point in stubble land was less than 1 within 20cm of height,and more than 1 within the height of 20-60cm.The B in plow tillage was less than 1 at each height.Therefore,in the case of abandoned shrub grassland and farmland intensively distributed into pieces in Hebei province,stubble farming was still an effective tillage combating wind erosion and desertification in the dry field.

关 键 词：旱作大田块 留茬地 翻耕地 风蚀物有机质 变化特征 

分 类 号：S158[农业科学—土壤学]