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• W2360285158 abstract "The Dongzhi loess tableland where the Xifeng Agrometeorological Experimental Station is situated was considered the most representative site of Loess Plateau.By using the data of water storage capacity in 200 cm soil and wheat yield collected by that station during the recent 20 years,we analyzed the influence of water storage capacity in deep soil layers on yield based on the air precipitation-soil moisture-plant(ASP) recycle system theory.The results showed that the reducing trend of soil water storage capacity was linked to climate drying and warming.The average soil water storage capacity was 351mm and was reduced by 21.4 mm every ten years.During critical wheat growth periods such as jointing,and booting to flowering,the soil water storage reduced further by 32.1 mm and 54.2 mm respectively.During autumn and reviving period,the soil water slightly reduced by 12.2 mm and 7.6 mm respectively.The frequency of drought increased when approaching and during reproductive period.The turning point year of climate drying and abnormal climatic yield was from 1994 to 1995.Spike sterility rate and thousand kernel weight(TKW) are the main factors affecting yield.A close relationship among these factors was found.Spike sterility rate was most sensitive to soil water storage,followed by TKW,and grain number per spike is the least.The soil water storage and TKW showed positive correlation in every growth period.A linear correlation was found during bolting period and an increase of storage capacity by 10mm in 200cm soil was correlated with 0.8g increase in TKW.When the soil water storage was maintained between 320 mm and 500 mm,the frequency of TKW≥30g was 80%.Soil water storage is the most important factor affecting yield.The water storage of 200 cm soil at jointing stage is closely related to climate yield.Wheat plants utilized water from shallow soil layer at seedling stage,and middle to deep layer water at vegetative to reproductive growth stage.The later the growth period,the deeper the soil water was utilized.The stored water in all layers played important roles in yield formation,particularly moderate shallow layer(50—100cm).During reproductive period,the soil storage water transported from deep to shallow layers,which casted a compensation effect for maintaining yield.The soil water storage capacity in autumn and reviving to jointing also played an important role in yield when water demand was high.We found that soil water storage contributed great deal to winter wheat yield.Yearly fluctuation in yields was correlated with soil water storage.Soil water storage affected yield dramatically.For example,the climatic yield that was 604.4 kg/ hm2 during 1990—1994 was dropped to-154.2kg/hm2 during 1995—2000.The climatic yield decreased by 758.6 kg/ hm2,125.5% in all.The frequency of drought was increased when climate became more drying and good harvest year was decreased by 20% and poor harvest year was increased by 12%.To establish winter wheat climate yield prediction models,we suggested that the soil water storage capacity in shallow layer should be used for early stage prediction models,moderate shallow water storage at jointing period for mid-stage models,and moderate shallow in conjunction with deep water storage during jointing period for composite model.These results suggested that set of countermeasure and mechanism should be developed to copy with climate drying and warming and guarantee the safety of wheat productivity." @default.
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• W2360285158 date "2011-01-01" @default.
• W2360285158 modified "2023-09-23" @default.
• W2360285158 title "Influence of water storage capacity on yield of winter wheat in dry farming area in the Loess Plateau" @default.
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