Agronomic management practices in dryland wheat result in variations in precipitation use efficiency due to their differential impacts on the steps in the precipitation use process  

作　　者：YANG Wen-jia LI Yu-lin LIU Wei-jian WANG Shi-wen YIN Li-na DENG Xi-ping 

机构地区：[1]State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,College of Natural Resources and Environment,Northwest A&F University,Yangling 712100,P.R.China [2]College of Life Sciences,Northwest A&F University,Yangling 712100,P.R.China [3]Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,P.R.China [4]Institute of Soil and Water Conservation,Chinese Academy of Sciences&Ministry of Water Resources,Yangling 712100,P.R.China

出　　处：《Journal of Integrative Agriculture》2023年第1期92-107,共16页农业科学学报（英文版）

基　　金：support of the National Key Research and Development Program of China(2021YFD1900705);the National Basic Research Program of China(2015CB150402);the National Key Technology R&D Program of China(2015BAD22B01).

摘　　要：Yield loss due to low precipitation use efficiency(PUE)occurs frequently in dryland crop production.PUE is determined by a complicated process of precipitation use in farmland,which includes several sequential steps:precipitation infiltrates into the soil,the infiltrated precipitation is stored in soil,the soil-stored precipitation is consumed through transpiration or evaporation,transpired precipitation is used to produce dry-matter,and finally dry-matter is re-allocated to grains.These steps can be quantified by six ratios:precipitation infiltration ratio(SW/SWe;SW,total available water;SWe,available soil water storage at the end of a specific period),precipitation storage ratio(SWe/P;P,effective precipitation),precipitation consumption ratio(ET/SW;ET,evapotranspiration),ratio of crop transpiration to evapotranspiration(T/ET;T,crop transpiration),transpiration efficiency(B/T;B,the increment of shoot biomass)and harvest index(Y/B;Y,grain yield).The final efficiency is then calculated as:PUE=SWe/P×SW/SWe×ET/SW×T/ET×B/T×Y/B.Quantifying each of those ratios is crucial for the planning and execution of PUE improvements and for optimizing the corresponding agronomic practices in a specific agricultural system.In this study,those ratios were quantified and evaluated under four integrated agronomic management systems.Our study revealed that PUE and wheat yield were significantly increased by 8–31%under manure(MIS)or biochar(BIS)integrated systems compared to either conventional farmers’(CF)or high N(HN)integrated systems.In the infiltration and storage steps,MIS and BIS resulted in lower SWe/P but higher SW/SWe compared with CF and HN.Regarding the consumption step,the annual ET/SW under MIS and BIS did not increase due to the higher ET after regreening and the lower ET before regreening compared with CF or HN.The T/ET was significantly higher under MIS and BIS than under CF or HN.In the last two steps,transpiration efficiency and harvest index were less strongly affected by the agronomic management system,alt

关 键 词：precipitation use process precipitation use efficiency yield rainfed agriculture 

分 类 号：S512.1[农业科学—作物学]