东北黑土区典型坡面耕作侵蚀定量分析

被引：26

作者：

赵鹏志

陈祥伟

王恩姮

机构：

[1] 东北林业大学林学院

来源：

农业工程学报 | 2016年 / 32卷 / 12期

关键词：

侵蚀; 土壤; 运移; 耕作; 空间分布; 坡耕地; 铧式犁;

D O I：

暂无

中图分类号：

S157.1 [水土流失的原因及其防治];

学科分类号：

090301 [土壤学];

摘要：

东北黑土区水土流失主要集中在坡耕地,以往研究多关注水蚀而忽略了耕作侵蚀的存在。为印证并定量描述黑土耕作侵蚀,该文采用物理示踪法,测定了典型坡耕地耕作位移量及其分布格局。结果表明:铧式犁耕作后示踪剂沿耕作方向发生扩散,上坡耕作示踪剂集中分布在0～20 cm范围,而下坡耕作示踪剂集中分布在0～20和50～150 cm。一次耕作引起的耕作位移量为32.68～134.14 kg/m,耕作迁移系数234 kg/m。坡度是影响耕作位移的重要因素,二者呈显著的正相关关系,且对上坡耕作的影响大于下坡耕作。研究区耕作年侵蚀速率0.4～11.0 Mg/(hm2·a),凸起的坡背、坡肩处及坡度较大的位置侵蚀严重。虽然黑土区坡度较小,但由于耕作深度大,速度快,耕作侵蚀严重,应引起足够重视。

引用

页码：151 / 157

页数：7

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