东北典型黑土区坡耕地涝渍地土壤持水性和导水性研究

发布时间：2018-01-31 19:26

本文关键词： 黑土坡耕地涝渍地土壤水分特征曲线　出处：《水土保持研究》2017年06期 　论文类型：期刊论文

【摘要】：中国东北典型黑土区是我国重要的商品粮生产基地,对我国粮食安全和国民经济的稳定起到举足轻重的作用。作为土壤退化的一种特殊形式,涝渍地严重影响着垦区的农业生产。在东北典型黑土区坡面涝渍地及其周围正常耕地中布设采样点,测定了土壤剖面质地分布情况及土壤水分特征曲线,以揭示东北黑土区坡面涝渍地土壤水分过大的根本原因。结果表明,涝渍地土壤剖面中细质地土壤类型所占比例为90%,质地较粘重。涝渍地土壤具有较高的进气值,水吸力较大,保持在中小孔隙中的水分只有在较大吸力范围内才能缓慢释出,这造成涝渍地土壤具有极强的持水能力,不容易失水,再加上极弱的导水能力,水分饱和但不会被释放。以上这些土壤特性导致了涝渍地土壤长期处于湿度过大的状态。本研究结果可为涝渍地治理提供依据。
[Abstract]:The typical black soil region of northeast China is China's important commodity grain production base, an important role on China's food security and national economy. As a special form of soil degradation, waterlogged land reclamation seriously affected agricultural production. In the typical black soil region of Northeast China and its surrounding normal farmland waterlogging in the layout of sampling points, soil profile texture distribution and soil moisture characteristic curves were measured, the fundamental reason to reveal the soil moisture in waterlogged land in black soil region of Northeast China is too large. The results showed that soil waterlogging in fine textured soil types accounted for 90%, texture is heavy. The intake of waterlogged land the soil has a high value of water suction is large, keep in the small pore water in order to slow release only in high suction range, which caused the waterlogged soil with water holding ability strong, not easy to dehydration, Coupled with very weak water conductivity, water is saturated but not released. The above characteristics of soil lead to the long-term soil humidity in waterlogged soil. The results of this study can provide a basis for waterlogged land management.

【作者单位】：北京师范大学地理学与遥感科学学院;中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;北京市一六五中学;
【基金】：国家自然科学基金(41571259);国家自然科学基金重点项目(41530858) 中国科学院“西部之光”人才培养引进计划的资助
【分类号】：S152.7
【正文快照】： 中国东北典型黑土区是我国重要的商品粮生产基地,对我国粮食安全和国民经济的稳定起到举足轻重的作用[1]。作为土壤退化的一种特殊形式,涝渍地严重影响着垦区的农业生产。我国共有3 207万hm2涝渍地[2-3],仅黑龙江省黑河市嫩江县鹤山农场鹤北小流域中的涝渍地面积就占整个流域

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