Comparison of soil water characteristic curves of saline-alkali land under different farmland shelterbelts
CHEN Yinping1,2, XIA Jiangbao1, LIU Junhua1
1. Binzhou University, Shandong Provincial Key Laboratory of Eco-environmental Science for Yellow River Delta, 256603, Binzhou, Shandong, China; 2. Shandong Agricultural University, College of Resources and Environment, 271018, Tai'an, Shandong, China
Abstract：[Background] The Yellow River Delta is the largest estuarine wetland ecosystem in the warm temperate zone in China. However, rainfall was less and the mineral content in underground water was high, which caused soil salinization and alkalization. In this region, the coordinated adaptation of water between plant and soil is the key issue in agricultural development. Therefore, studying the water retention ability of farmland shelterbelts is very important.[Methods] Three typical plant configuration modes Populus tomentosa forest, Fraxinus chinensis forest and mixed forest (P. tomentosa + F. chinensis) were selected as research object,the methods of drying and cutting-ring were used to study water content and physical properties of soil. The soil water contents under different suctions were measured using a high-speed centrifuge, and the characteristic curve were obtained using the mathematical models of Gardner and van Genuchten. Then, parameters such as soil water characteristic curves, soil water capacity, specific water capacity and soil water retention were compared among different farmland shelterbelts. The RMSE (Root Mean Squared Error) and R2 were used to evaluate the fitting of two models for soil water characteristic curves.[Results] In three farmland shelterbelts in Yellow River Delta, with the increase of suction, the variation of soil water content declined fast (-1.0×105-0 Pa) to slow (-3.5×105--1.0×105 Pa) to steady (-11.0×105--3.5×105 Pa). Specific water capacity decreased monotonously and tended to zero infinitely. Soil water characteristic curves at different soil depths showed a steep trend and strong water loss in low suction range, while they presented a smooth and slow trend, with a high water retention ability in high suction range. The soil water retention ability in the three forests was as follows:mixed forest > P. tomentosa forest > F. chinensis forest. The mean value of R2 and RMSE of van Genuchten model was 0.980 and 0.028, that of Gardner model was 0.999 and 0.002, on the whole, the van Genuchten model was superior to the Gardner model on fitting the soil water characteristic curves, and it was advisable to use the van Genuchten model to fit soil water characteristic curve of farmland shelterbelt in the Yellow River Delta.[Conclusions] We should increase soil water conservation and select drought-tolerant species in the construction of farmland shelterbelts in the Yellow River Delta.
陈印平, 夏江宝, 刘俊华. 不同农田防护林下盐碱地土壤水分特征曲线差异对比[J]. 中国水土保持科学, 2019, 17(5): 18-24.
CHEN Yinping, XIA Jiangbao, LIU Junhua. Comparison of soil water characteristic curves of saline-alkali land under different farmland shelterbelts. SSWC, 2019, 17(5): 18-24.
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2019, Vol. 17 
