膜下滴灌不同灌水控制下限对设施土壤团聚体分布特征的影响

doi:10.3864/j.issn.0578-1752.2017.18.012

Abstract

Abstract: 【Objective】 Irrigation is the main source of soil moisture and affects the soil structure stability under greenhouse condition. The objective of this paper is to explore the effects of different controlled irrigation low limits on composition and stability of soil aggregates in a greenhouse soil. Results of the study will provide a theoretical basis for reasonable water regulation and improvement soil structure.【Method】The irrigation experiments were conducted in a greenhouse at the scientific research base of Shenyang Agricultural University, China during the period from 2011 to 2016. The test crop was tomato, and the planting mode was ridge and furrow covering. Different controlled irrigation low limits were set to: 20 kPa (D20), 30 kPa (D30), 40 kPa (D40), respectively, and the irrigation allowable upper limit of them was set to 6 kPa. Soil water suctions detected by tensiometers were placed in 30 cm soil layer. The aggregates amount, macro-aggregate content (R_0.25), geometric mean diameter (GMD), mean weight diameter (MWD), structure deterioration rate (RDS), unstable aggregates index (E_lT)and fractal dimension (D) were examined by dry and wet sieving methods. 【Result】 In the 0-30 cm soil layer, the electrical conductivity (EC), cation exchange capacity (CEC) and soil bulk density in D40 treatment were significantly lower than those of D20 and D30 treatments (D40＜D30＜D20). The pH value of D20 treatment was significantly lower than that of D30 and D40 treatments (P＜0.05). In the 0-30 cm soil layer, the size class of dry-stable aggregate was mainly composed of ＞2 mm and 1-0.25 mm (23.01%-39.98%); the size class of water-stable aggregate was mainly composed of 1-0.25 and 0.25-0.053 mm (31.08%-47.27%). In the 0-20 cm soil layer, R_0.25, GMD and MWD in D30 treatment were significantly higher than those of D20 and D30 treatments. While in the 20-30 cm soil layer, the wet stable aggregate content of D20 treatment was significantly higher than that of D30 and D40 treatments (P＜0.05). The soil structure deterioration rate (RDS) and unstable aggregate index (E_lT) increased with soil depth under different irrigation control limits, and the variation of RDS and E_lT was similar. In the 0-20 cm soil layer, the RDS and E_lTof D30 treatment were significantly lower than those of D20 and D30 treatments. But in the 20-30 cm soil layer, the RDS of D20 treatment was lower than those of D20 and D30 treatments by 12.2% and 16.8%, respectively. By dry sieving, the soil fractal dimension (D) of D20, D30 and D40 in the 20-30 cm soil layer was 2.13, 2.08 and 2.19, respectively; by wet sieving, that of D20, D30 and D40 treatment in the 20-30 cm soil layer was 2.31, 1.99 and 2.12, respectively. Overall, compared with D20 and D40, D30 treatment significantly reduced the fractal dimension (D) in the aggregates.【Conclusion】 The result suggests that the 30 kPa drip irrigation treatment greatly enhanced the composition of macroaggregates and the stabilization of soil structure.

Key words: the greenhouse soil, plastic mulching and drip irrigation, lower limit of irrigation, soil aggregates

MA JianHui, YE XuHong, HAN Bing, LI Wen, YU Na, FAN QingFeng, ZHANG YuLing, ZOU HongTao, ZHANG YuLong. Effects of Different Controlled Irrigation Low Limits on the Size Distribution of Soil Aggregates with Drip Irrigation Under Film Mulching in a Greenhouse Soil[J].Scientia Agricultura Sinica, 2017, 50(18): 3561-3571.

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Effects of Different Controlled Irrigation Low Limits on the Size Distribution of Soil Aggregates with Drip Irrigation Under Film Mulching in a Greenhouse Soil

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