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[1]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.

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Soil Water Dynamics of Natural Thinning Haloxylon ammodendron in Minqin Oasis

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 05 Page number: 192-198 Column: Public date: 2018-09-06

Title:: Soil Water Dynamics of Natural Thinning Haloxylon ammodendron in Minqin Oasis

Author(s):: DING Aiqiang¹, XU Xianying^1,2, LIU Jiang¹, CUI Wentian³, ZHANG Rongjuan⁴, ZHAO Peng², FU Guiquan²; 1. Minqin Desert Control Comprehensive Experimental Station, Chinese Academy of Forestry, Minqin, Gansu 733000, China;
2. Gansu Desert Control Research Institute, Lanzhou 730070, China;
3. College of Forestry, Gansu Agricultural University, Lanzhou 730070, China;
4. Fufeng Bureau od Forestry, Fufeng, Shaanxi 722200, China

Keywords:: natural thinning; density; soil moisture; temporal and spatial dynamics; mathematical model; artificial Haloxylon ammodendron forest

CLC:: S715.1

DOI:: -

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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