DING Aiqiang,XU Xianying,LIU Jiang,et al.Soil Water Dynamics of Natural Thinning Haloxylon ammodendron in Minqin Oasis[J].Research of Soil and Water Conservation,2018,25(05):192-198.
民勤绿洲自然稀疏人工梭梭林土壤水分动态
- Title:
- Soil Water Dynamics of Natural Thinning Haloxylon ammodendron in Minqin Oasis
- Keywords:
- natural thinning; density; soil moisture; temporal and spatial dynamics; mathematical model; artificial Haloxylon ammodendron forest
- 分类号:
- S715.1
- 摘要:
- 为探明自然稀疏林带不同密度对土壤水分动态的影响，建立了土壤水分与林分密度之间数量关系的数学模型。以民勤绿洲-荒漠过渡带自然稀疏的人工梭梭林为研究对象，通过长期土壤水分定位观测，对不同自然稀疏密度梭梭林土壤水分时空动态及密度与土壤水分之间的关系进行了研究。结果表明：（1）不同密度人工梭梭固沙林土壤水分随时间的变化可分为4个阶段：3月初-5月中旬，是土壤水分回升期；5月下旬-9月下旬，土壤水分在丰水年（2015年）为动态平衡期，在枯水年（2016年）为消耗期；10月、11月为水分消退期，12月-翌年2月份，是土壤水分低稳期；（2）雨养条件下，梭梭对土壤水分的消耗主要发生在40 cm以下层，且密度越大消耗越大，变异系数也越大；浅层（0-40 cm）土壤水分变化剧烈，但与林带密度之间的规律不明显；（3）林带土壤剖面平均水分含量无论在全年还是在生长季或非生长季，均随密度的增大而减小；（4）不同退化程度人工梭梭林土壤水分含量与密度之间呈负相关，模型表达式为：Y=394.67D2-68.769D+6.526（0 ≤ D ≤ 0.165），R2=0.934。不同密度人工梭梭林土壤水分随季节的动态变化趋势基本一致，但是受极端降雨事件的影响，在不同年份生长季土壤水分的变化不一致；密度与土壤水分含量之间的的关系可以用二次函数模型来反映。
- Abstract:
- The influence of different density of natural thinning forest belt on soil water dynamics was proved. A mathematical model was established to quantify relationship between soil moisture and stand density. Natural thinning artificial Haloxylon ammodendron forest in the Minqin oasis desert ecotone was selected as the research site. We studied the temporal dynamics of soil moisture content and relationship between the density and soil moisture by long-term observation data of soil moisture. The results showed that:(1) soil moisture content had obvious temporal variation, the annual variation of soil moisture content could be divided into 4 periods, i.e., moisture rising period (from early March to middle May), dynamic balance period (2015 year) or moisture losing period (2016 year) in late May to late September, faded period (October and November), moisture stable period (from December to following February); (2) under rain-fed conditions, soil moisture was mainly consumed by Haloxylon ammodendron in the layer below the 40 cm, and the higher density was, the greater the consumption was, the coefficient of variation of soil moisture was also significant in the shallow layer 0-40 cm), which had no the obvious relationship with the forest density; (3) the average soil moisture content of profile decreased with the increase of density at anytime; (4) soil water contents of artificial Haloxylon ammodendron forestands with the different degrees of degradation were density negatively related to densities, which can be described by Y=394.67D2-68.769D+6.526(0 ≤ D ≤ 0.165), R2=0.934. Dynamic changes of soil moisture in different densities of artificial Haloxylon ammodendron is same over the seasons, but it was affected by the extreme rainfall events, changes of soil moisture in different growing seasons were not consistent, the relationship between density and soil moisture content can be expressed by using the quadratic function model.
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备注/Memo
收稿日期:2017-09-19;改回日期:2017-11-09。
基金项目:国家重点基础研究发展计划（2012CB723203）；国家科技支撑项目（2012BAD16B0203）
作者简介:丁爱强(1991-),男,甘肃康乐人,在读硕士,水土保持与荒漠化防治专业。E-mail:aiqiangding5@163.com
通讯作者:徐先英(1963-),男,甘肃武威人,研究员,博士,主要从事荒漠化生态及水文研究。E-mail:xyingxu@163.com