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[1]LI Hongqin,WANG Zhuoquan,ZHANG Fawei,et al.Soil Water Conservation Function of an Alpine Graminoid-Kobresia Meadow on the Southern Slope of the Qilian Mountains[J].Research of Soil and Water Conservation,2022,29(03):135-141+146.

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Soil Water Conservation Function of an Alpine Graminoid-Kobresia Meadow on the Southern Slope of the Qilian Mountains

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 03 Page number: 135-141+146 Column: Public date: 2022-04-20

Title:: Soil Water Conservation Function of an Alpine Graminoid-Kobresia Meadow on the Southern Slope of the Qilian Mountains

Author(s):: LI Hongqin¹, WANG Zhuoquan¹, ZHANG Fawei^2,3,4, YI Lyubei⁵, GUO Xiaowei³, LI Yikang³, LIN Li³, CAO Guangmin³, LI Yingnian^2,3, ZHOU Huakun^3,4; (1.College of Life Sciences, Luoyang Normal University, Luoyang,Henan 471934, China; 2.Institute of Sanjiangyuan National Park, Chinese Academy of Sciences, Xining 810008, China; 3.Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China; 4.Qinghai Provincial Key Laboratory of Restoration Ecology in Cold Region, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining810008......)

Keywords:: Graminoid-Kobresia meadow; effective soil water storage; soil moisture absorption rate; soil dehumidification rate; boosted regression trees

CLC:: S812

DOI:: -

Abstract:: The Qinghai-Tibetan Plateau is well-known as ‘water towers for China', and alpine meadow is one of the most important vegetation types while its water conservation capacity remains unclear. The continuous volumetric soil water content data of an alpine graminoid-Kobresia meadow were analyzed to quantify the effective soil water storage(the difference of measured soil water storage and minimal soil water storage)and soil hydrological regulation function(the temporal rate of effective soil water storage)and their environmental controls during the growing season(mid-June through end-September)on the southern foot of the Qilian Mountains from 2014 to 2018. The results showed that the annual total(0—100 cm)effective soil water storage averaged(44.3±8.7)mm(Mean±S. D., the same below)and exhibited a bimodal season pattern, with the first peak of(57.8±14.4)mm at the end of June and the second peak of(59.2±15.7)mm in the middle of September; the shallow layer(0—20 cm), mid-layer(20—60 cm)and deep layer(60—100 cm)accounted for 53.1%, 34.9% and 12.0% of total effective soil water storage, respectively; effective soil water storage was negatively related to soil depth logarithmically(R²= 0.82, p< 0.001). The boosted regression trees showed that the seasonal variations of effective soil water storage were mainly regulated by soil temperatures, especially by 5 cm soil temperature, where they negatively correlated. The annual soil water storage along soil depths was closely related to the ratio of soil clay(R²=0.99,p=0.004). The average annual soil moisture absorption rate and dehumidification rate of the root zone(0—40 cm)were(0.21±0.02)mm/h and(0.22±0.02)mm/h, respectively. The t-test showed that, except 0—5 cm soil layer, the soil dehumidification rate was significantly greater than the moisture absorption rate in the root zone. Correlation analysis revealed that soil temperatures more than soil moistures drove the season variations of soil moisture absorption and dehumidification rate. Therefore, soil temperature was the main factor influencing the effective soil water conservation and hydrological regulation function of alpine graminoid-Kobresia meadows. These findings suggested that maintaining low soil temperatures would be an important basis for persevering and improving the water retention function of alpine meadows.

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Last Update: 2022-04-20