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Water 2017, 9(10), 725; doi:10.3390/w9100725

Assessing Agricultural Drought in the Anthropocene: A Modified Palmer Drought Severity Index

State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Authors to whom correspondence should be addressed.
Received: 17 July 2017 / Revised: 10 September 2017 / Accepted: 16 September 2017 / Published: 26 September 2017
(This article belongs to the Special Issue Drought Monitoring, Forecasting, and Risk Assessment)
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In the current human-influenced era, drought is initiated by natural and human drivers, and human activities are as integral to drought as meteorological factors. In large irrigated agricultural regions with high levels of human intervention, where the natural farmland soil moisture has usually been changed significantly by high-frequency irrigation, the actual severity of agricultural drought is distorted in traditional drought indices. In this work, an agricultural drought index that considering irrigation processes based on the Palmer drought severity index (IrrPDSI) was developed to interpret the real agricultural drought conditions in irrigated regions, with a case study in the Haihe River Basin in northeast China. The water balance model in the original PDSI was revised by an auto-irrigation threshold method combined with a local irrigation schedule. The auto-irrigation setting of the index was used by taking irrigation quotas during specific growth stages of specific crops (wheat–corn) into consideration. A series of weekly comparative analyses are as follows: (1) The soil moisture analyses showed that soil moisture values calculated by the modified water balance model were close to the real values; (2) The statistical analyses indicated that most of the stations in the study area based on IrrPDSI had nearly normal distributed values; (3) The time series and spatial analyses showed that the results of the IrrPDSI-reported dry-wet evaluation were more consistent with documented real conditions. All the results revealed that IrrPDSI performed well when used to assess agricultural drought. This work has direct significance for agricultural drought management in large irrigated areas heavily disturbed by human activity. View Full-Text
Keywords: PDSI; Anthropocene; irrigation; agricultural drought; soil moisture; Haihe River Basin PDSI; Anthropocene; irrigation; agricultural drought; soil moisture; Haihe River Basin

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yang, M.; Xiao, W.; Zhao, Y.; Li, X.; Lu, F.; Lu, C.; Chen, Y. Assessing Agricultural Drought in the Anthropocene: A Modified Palmer Drought Severity Index. Water 2017, 9, 725.

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