黄土塬区土地利用变化对深剖面土壤水分的影响

发布时间：2018-01-02 15:07

本文关键词：黄土塬区土地利用变化对深剖面土壤水分的影响　出处：《干旱地区农业研究》2016年04期 　论文类型：期刊论文

【摘要】：在长武塬区的6个地点分别采集农地、10年果园和20年果园10 m深剖面的土样,通过测定和分析不同样地的土壤水分,定量揭示其对土地利用变化的响应。结果表明:农地和10年果园土壤水分具有相似的垂向分布,随深度增加土壤水分含量增大,而20年果园随深度增加呈减小趋势,但6 m以下3种样地土壤水分随深度增加基本不发生变化;农地、10年和20年果园在0~6 m、6~10 m和0~10 m土层平均土壤水分含量分别为17.8%、17.5%和15.8%,20.4%、20.6%和14.8%,18.8%、18.7%和15.4%,与农地相比,20年果园0~6m、6~10m和0~10 m土层减少的土壤水分分别占农地的11%、27%和18%;农地6~10 m土壤储水量为1 063 mm,而转化为果园后随果龄增大而减小,其中10年果园无明显差异,但20年果园减少了291 mm,在该土层形成稳定的低湿层。20年果园6 m以下稳定的低湿层可能减少水分的深层渗漏进而降低地下水补给量,伴随着大面积的农地转化为人工林草,可能会对区域水循环造成影响。
[Abstract]:The farmland were collected in 6 locations in Changwu soil samples, 10 years and 20 years of orchard orchard 10 m deep profile, through the determination and analysis of soil moisture similarly, reveal its quantitative response to changes in land use. The results showed that the farmland and orchard soil moisture for 10 years with similar vertical distribution and the soil moisture content increased with the depth increasing, and 20 years of orchard increased with depth decreased, but the 6 m the following 3 kinds of soil moisture increase with depth does not change; agricultural land, 10 years and 20 years in the 0~6 m 6~10 m orchard, and 0~10 m soil layer the average soil water content was 17.8% 17.5%, and 15.8%, 20.4%, 20.6% and 14.8%, 18.8%, 18.7% and 15.4%, compared with the cropland, orchard 20 years 0~6m, 6~10m and 0~10 reduce the soil moisture in m soil layer accounted for 11% of the land, 27% and 18%; the 6~10 m soil water storage was 1063 mm, and into the orchard with fruit age. Decreases, which had no significant difference between the 10 years of the orchard, but 20 years of orchard was reduced by 291 mm deep seepage stability of low layer.20 orchard stable below 6 m in low layer may reduce water and reduce the amount of groundwater recharge is formed in the soil, with a large area of farmland into forest and grass, may cause the impact on regional water cycle.

【作者单位】：西北农林科技大学资源环境学院;黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金(51179161) 陕西省科学技术研究发展计划(2013KJXX-18) 中央高校基本科研业务费(2452015105)
【分类号】：S152.7
【正文快照】： 黄土高原生态脆弱,水土流失严重,大规模的水土保持措施导致土地利用发生显著的变化[1-4]。同时,黄土高原近年来水循环状况发生了明显的变化,如河流径流减少[5-6]和地下水位下降[7-8]等。土地利用变化与水文变化间存在一定的联系[9-10],而土壤水分是水循环中水分的重要来源,可

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