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[1]REN Jingyu,QIAO Yuning,YAN Luyao,et al.Dynamic Changes and Influencing Factors of Soil Moisture of Main Tree Species in Loess Hilly Region[J].Research of Soil and Water Conservation,2022,29(06):73-80,89.

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Dynamic Changes and Influencing Factors of Soil Moisture of Main Tree Species in Loess Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 06 Page number: 73-80,89 Column: Public date: 2022-10-20

Title:: Dynamic Changes and Influencing Factors of Soil Moisture of Main Tree Species in Loess Hilly Region

Author(s):: REN Jingyu¹, QIAO Yuning¹, YAN Luyao², CHEN Yunming^3,4; (1.Monitoring Center for Soil and Water Conservation and Ecological Environment of Yellow River Basin, Xi'an, Shaanxi 710021, China; 2.Yellow River Soil and Water Conservation West Peak Management and Supervision Bureau, Qingyang, Gansu 745000, China; 3.State key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 4.Institute of Soil and Water Conservation, CAS & MWR……)

Keywords:: soil moisture; temporal and spatial dynamics; meteorological factors; fitting model; Loess Hilly region

CLC:: S154.1

DOI:: -

Abstract:: In order to reveal the relationship between the soil-water storage status and vegetation growth in the Loess Hilly Area, and obtain optimal suitable tree species in the area, four types of tree species were taken as research objects. Based on the ECH₂O-5TM monitoring system and the U30-NRC weather station's data every 30 min from 2019 to 2020, the temporal variation characteristics of soil-water in this area and its relationship with the influencing factors were explained by using Excel and SPSS in order to process the soil volume water content, rainfall, air temperature, air relative humidity on monthly and seasonal scales, and multiple difference comparisons and curve estimation. The results showed that:(1)Soil moisture of Robinia pseudoacacia, Quercus wutaishanica and Platycladus orientalis was divided into a loss period(May—October), a recession period(October—January of the following year), an ascending period(February—April)and low-level period(March—May), Pinus tabuliformis and abandoned land control(CK)showed a steady ascending period from January to May, and there was a 30-day lag time difference between soil moisture and rainfall for each tree species.(2)The 50—80 cm soil section was at the peak of water content. With the increase of depth, the soil water content of different tree species had a positive and negative trend. The soil water content of Pinus tabuliformis had the weakest variation in the surface layer(20 cm).(3)The soil moisture status of Quercus wutaishanica was the best in whole year and non-growing season. During the growing season, the soil moisture of Quercus wutaishanica, CK and Pinus tabuliformis was significantly higher than that of other tree species. There was no significant difference in soil moisture of the same tree species in different periods.(4)The soil moisture of different tree species was negatively correlated with temperature, and positively correlated with rainfall and humidity. There was a threshold(about 70 mm)between soil moisture and rainfall. In conclusion, the soil moisture of the main tree species in the Loess Hilly Area changed most significantly during the growing season, and the soil moisture of Quercus wutaishanic and Pinus tabuliformis were abundant in different time periods, which can be selected as local water-storage and water-retention tree species.

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Last Update: 2022-10-20