Simulation and change characteristics of soil infiltration process during the short rotation of eucalyptus plantation
PAN Tiansen1, ZHAO Mingquan1, GUO Tianlei2, HUANG You1, DENG Yusong1, HUANG Yuhan1
1. Guangxi Colleges and Universities Key Laboratory for Cultivation and Utilization of Subtropical Forest Plantation, Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University, 530004, Nanning, China; 2. Changjiang River Scientific Research Institute, 430014, Wuhan, China
Abstract：[Background] Soil infiltration is an important process of forest water cycle. The plantation is an essential part of forests, and the change of soil infiltration capacity of plantation soil indicates the change of benefits on soil and water conservation. Because of the wide planting areas and short rotation of eucalyptus plantations in the southern subtropical area in China, soil infiltration capacities changing with forest age is meaningful to study the change of benefits on soil and water conservation and the hydrological cycle. [Methods] Our study focused on the plantation (Eucalyptus urophylla×E.grandis) in the State-owned Dongmen Forest Farm in the Guangxi Zhuang Autonomous Region of China. According to the rotation of eucalyptus plantation, four first generation eucalyptus plantations with differently forest ages (1, 2, 3, and 5 a) were selected for measuring the physical and chemical properties of soil particle size, soil bulk density, soil porosity, soil organic matter, and soil aggregate groups in three soil layers of 0-20, 20-40 and 40-60 cm.The soil infiltration rate was measured by the cutting ring method with variable water head and the soil infiltration process was fitted by four common models.[Results] 1) As the forest age increasing, the soil bulk density of four eucalyptus plantations ranged from 1.03 to 1.38 g/cm3with a fluctuant increase trend. The soil total porosities of four eucalyptus plantations ranged from 47.84% to 60.96% with a fluctuant decrease trend and the soil organic matter content of foureucalyptus plantations ranged from 8.94 to 29.06 g/kg with a fluctuant increase trend, as the forest age increasing. 2) Initial infiltration rate, stable infiltration rate, and cumulative infiltration had the significantly negative correlations with soil depth and soil bulk density (P<0.01), while these parameters had the significantly positive correlations with soil porosity and soil organic matter (P<0.01). Soil infiltration capacity at 0-20 and 20-40 cm soil layer had a changing trend of first rising and then decreasing with the increase of forest age, and soil infiltration capacity at 40-60 cm soil layer had a changing trend of first decreasing and then rising with the increase of forest age. 3) Compared with the soil infiltration processes fitted by Kostiakov model and Philip model, the Horton model and the general empirical model were more suitable to well fit the soil infiltration process of eucalyptus plantation. [Conclusions] The soil porosity, soil bulk density, and soil organic matter were significantly affected by forest age during the rotation of eucalyptus plantations. Consequently, the soil infiltration capacity of the shallow soil (0-20 cm) had a whole decrease trend and the soil infiltration capacity of deep soil (20-40 cm and 40-60 cm) had a whole increased trend with the increase of forest age in eucalyptus plantations.Our results may provide a science basis for sustainable management of the eucalyptus plantations.
潘天森, 赵明全, 郭天雷, 黄幼, 邓羽松, 黄钰涵. 短轮伐期桉树人工林土壤入渗过程模拟与变化特征[J]. 中国水土保持科学, 2023, 21(5): 129-137.
PAN Tiansen, ZHAO Mingquan, GUO Tianlei, HUANG You, DENG Yusong, HUANG Yuhan. Simulation and change characteristics of soil infiltration process during the short rotation of eucalyptus plantation. SSWC, 2023, 21(5): 129-137.
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2023, Vol. 21 
