Preprint Article Version 1 This version is not peer-reviewed

Effects of Changes in Soil Hydraulic Properties after Crop Abandonment on Co-Occurring Perennial Species in a Semi-Arid Grassland in Mongolia

Version 1 : Received: 16 August 2018 / Approved: 17 August 2018 / Online: 17 August 2018 (12:01:57 CEST)

How to cite: Yanagawa, A.; Fujimaki, H.; Jamsran, U.; Okuro, T.; Takeuchi, K. Effects of Changes in Soil Hydraulic Properties after Crop Abandonment on Co-Occurring Perennial Species in a Semi-Arid Grassland in Mongolia. Preprints 2018, 2018080302 (doi: 10.20944/preprints201808.0302.v1). Yanagawa, A.; Fujimaki, H.; Jamsran, U.; Okuro, T.; Takeuchi, K. Effects of Changes in Soil Hydraulic Properties after Crop Abandonment on Co-Occurring Perennial Species in a Semi-Arid Grassland in Mongolia. Preprints 2018, 2018080302 (doi: 10.20944/preprints201808.0302.v1).

Abstract

The objective of this study was to investigate successional changes in water flow as a result of changes in soil hydraulic properties after crop abandonment under drought and non-drought conditions, and under water uptake by co-occurring perennial plant species to clarify the observation that typical perennial grass species are seldom observed in abandoned fields. Soil hydraulic properties were measured in croplands which had been abandoned for different periods (2, 9, and 18 years from abandonment) and in a grazed grassland site. Hydrological processes in the soil profiles were simulated with soil hydraulic properties under drought and non-drought summer conditions with water uptake from perennial grass species Suction in the surface soils increased with the period of abandonment, with this trend being particularly obvious in a drought year. Available water appears to be restricted in the later successional stage of abandoned fields and in grazed grassland for plants that have drought tolerance. Dry soil and climate conditions are important factors determining the intrusion of the typical perennial grass, S. krylovii, into degraded abandoned fields. This abiotic interaction between soil hydraulic properties and climate conditions may play an important role for plant succession in abandoned cropland.

Subject Areas

unsaturated hydraulic conductivity; water restoration; cumulative transpiration; particle size distribution; grazed grassland

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