灌水施氮方式對玉米生育期土壤NO3N時空分布的影響

漆棟良 胡田田，2

(1.西北農林科技大學水利與建筑工程學院， 陜西楊凌 712100；2.西北農林科技大學旱區農業水土工程教育部重點實驗室， 陜西楊凌 712100)

灌水施氮方式對玉米生育期土壤NO3N時空分布的影響

漆棟良1胡田田1，2

(1.西北農林科技大學水利與建筑工程學院， 陜西楊凌 712100；2.西北農林科技大學旱區農業水土工程教育部重點實驗室， 陜西楊凌 712100)

引言

關于氮肥損失的途徑，除了氨揮發和反硝化作用外，硝態氮的淋溶是一條重要途徑。調控土壤中的硝態氮含量被認為是降低氮素損失和提高氮肥利用率的關鍵[1]。前人研究了不同水、氮供應水平下土壤硝態氮的空間分布[2-3]和動態變化[4]，發現施氮量是造成土壤中硝態氮殘留的主要因素[3]，灌水量則直接影響到硝態氮的下移[5]。合理的灌水施氮措施可使土壤中的硝態氮更多地、較長時間地維持在作物根區，易于被根系吸收，收獲后其殘留量減小。

1 材料與方法

1.1 試驗概況

試驗于2012年4—9月份在農業部作物高效用水武威科學觀測實驗站(37°57′20″N、102°50′50″E)進行。實驗站位于甘肅省武威市涼州區, 地處騰格里沙漠邊緣。海拔高度1 581 m，為大陸性溫帶干旱氣候，該地區多年平均氣溫為8℃，多年平均降水量約為164.4 mm,年均蒸發量為2 000 mm。玉米生育期內降水量為129.0 mm(最大單次降水量為20.4 mm)。試驗地土壤類型為灰鈣質輕砂壤土，田間持水量為21.7% (質量含水率)。土壤堿解氮質量比為50.3 mg/kg，有效磷質量比為3.82 mg/kg，有機質質量比為8.9 g/kg，土壤pH值約為8.2。灌溉水源為礦化度0.71 g/L的地下水，地下水埋深40 m以上。

供試作物為制種玉米，品種是金西北22號。采用壟植溝灌技術，溝和壟的斷面為梯形。溝深30 cm，溝底寬20 cm，壟頂寬20 cm，壟底寬35 cm，溝間距55 cm，溝長5 m。小區為東西走向，四周開闊，面積24 m2(4 m×6 m)。

1.2 試驗設計

試驗采用二因素三水平隨機區組設計。設施氮方式和灌水方式2個因素，各分3種不同方式：灌水方式包括交替灌水、均勻灌水和固定灌水；施氮方式包括交替施氮、均勻施氮和固定施氮。其中，固定灌水固定施氮處理又分為水氮同區(灌水溝和施氮溝相同，FFT)和水氮異區(灌水溝和施氮溝相反，FFY)2種情況，共有10 個處理，見表1。隨機區組排列，共3個區組，區組之間設1.5 m寬隔離帶，試驗布置見圖1(與區組1相似，各處理在區組2、3內隨機排列)。

表1 試驗設計Tab.1 Experimental design

圖1 試驗布置圖Fig.1 Arrangement diagram of experiment

1.3 試驗實施

起壟前，在壟的位置以過磷酸鈣(45 kg/hm2，以P2O5計)作為底肥均勻撒施。之后，開溝起壟。4月19日播種，9月20日收獲。各處理灌水量和施氮量相同，灌溉定額3 750 m3/hm2，施氮量采用當地適宜的施氮水平200 kg/hm2(純氮)[14]。灌水量在低壓管出水口處用精確水表測量。灌水量和灌水時間與當地農民對制種玉米的灌水管理保持一致，共灌水5次，分別在播后3 d、拔節期(播后45 d)、大喇叭口期(播后84 d)、抽雄期(播后98 d)、灌漿期(播后119 d)，各灌水750 m3/hm2。氮肥選用尿素，分3次施入，基施50%，大喇叭口期和抽雄期各25%。肥料施在溝中(壟上不施)，開溝施肥，施后覆土。氮肥基施時，固定施氮在南側(FFT)或北側溝(FFY)，交替施氮在南側溝；其后固定施氮位置不變，交替施氮在南、北側溝交替進行；均勻施氮在南、北兩側溝同時施氮，且兩側施氮量相等。追施氮肥時，施肥、灌水在同一天內完成。具體實施見表2。

表2 灌水與施氮的時期與位置Tab.2 Time and location of irrigation and nitrogen supply

注：固定施氮條件下，對FFY施氮位置為北側溝，對FFT施氮位置為南側溝。DAT表示播種后的天數，設定播種當天的天數為0 d。

1.4 測定項目與方法

圖2 土壤取樣示意圖Fig.2 Schematic of soil sampling

1.5 數據處理

用SigmaPlot軟件繪圖，SPSS 12.0進行方差分析與多重比較，方差分析用One-way ANOVA，多重比較用Duncan法。

2 結果與分析

取樣位置影響因子土層深度/cm0～2020～4040～6060～8080～100灌水方式***NSNS植株北側施氮方式******NS灌水方式×施氮方式***NSNSNS灌水方式**NS*NS植株南側施氮方式******NS灌水方式×施氮方式***NSNSNS灌水方式**NSNSNS植株下施氮方式**NSNSNS灌水方式×施氮方式*NSNSNSNS

注: *、**分別表示在P<0.05和P<0.01水平差異顯著，NS表示差異不顯著。

圖3 灌漿期不同處理下土壤含量的空間分布(單位：mg/kg)Fig.3 Spatial distributions of soil nitrate nitrogen in different treatments at filling stage

圖4 灌漿期AC、CC和FC處理下土壤質量含水率的空間分布(單位：%)Fig.4 Spatial distributions of soil moisture content at filling stage for AC, CC and FC treatments

圖5 AC、CC、FFT和FFY不同位置在0～100 cm土壤含量隨播后天數的變化Fig.5 Dynamics of soil nitrate nitrogen content following days after planting at different positions in 0～100 cm soil depth of AC, CC, FFT and FFY treatments

3 討論

處理土層深度/cm0～2020～4040～6060～8080～1000～100AA29.2±2.1c28.4±1.8c15.6±0.7b12.1±0.6b10.1±0.3b95.3±2.9fAC28.6±2.2c27.2±2.1c14.8±1.3b11.3±0.8b9.7±0.5b91.5±3.4fAF31.3±3.4b30.6±2.7b17.6±1.1b13.5±1.0b11.7±0.8b104.8±4.8dCA31.3±2.8b30.9±2.8b15.5±1.0b12.8±1.3b11.7±0.8b103.1±4.2eCC30.7±2.7b30.5±3.0b16.6±0.9b12.9±0.7b11.5±0.4b102.2±2.4eCF34.6±3.6ab33.1±3.5b18.5±1.4a14.9±1.2a11.3±0.9b112.4±3.5cFA32.7±3.8b31.5±2.8b16.2±1.1b15.5±1.8a11.3±0.8b107.2±3.4cdFC32.6±3.5b31.6±1.8b14.6±0.8b14.5±0.5a12.0±1.1b105.3±4.5cdFFT34.8±4.1ab32.5±3.2b18.9±1.3a16.6±1.3a13.7±1.3a116.5±4.8bFFY44.5±4.8a42.8±4.4a14.6±0.7b10.6±0.9c9.8±0.4b123.3±6.1a

注：同列數值后不同字母表示各土層的土壤NO3-N殘留量差異達P<0.05顯著水平。

圖6 AC、CC和FC處理下0～100 cm土層植株南、北兩側土壤含水率隨生育期的變化Fig.6 Changes of soil moisture content in south and north of plant in 0～100 cm soil depth during growth period for AC, CC and FC treatments

4 結論

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Effects of Different Nitrogen Supply and Irrigation Methods on Spatial-temporal Distribution of Soil Nitrate Nitrogen during Maize Growth

QI Dongliang1HU Tiantian1,2

(1.CollegeofWaterResourcesandArchitecturalEngineering,NorthwestA&FUniversity,Yangling,Shaanxi712100,China2.KeyLaboratoryofAgriculturalSoilandWaterEngineeringinAridandSemiaridAreas,MinistryofEducation,NorthwestA&FUniversity,Yangling,Shaanxi712100,China)

A field experiment was conducted to investigate the effect of varying supply methods of nitrogen and irrigation on dynamics and distribution of soil nitrate nitrogen during maize (ZaymaysL., cv. Gold northwestern 22) growth in Northwest China. Irrigation methods included alternate furrow irrigation (AI), fixed furrow irrigation (FI) and conventional furrow irrigation (CI). Nitrogen supply methods included alternate nitrogen supply (AN), fixed nitrogen supply (FN) and conventional nitrogen supply (CN), which were applied at each irrigation. Maize rows were established in west-east direction. Soil nitrate nitrogen content in south and north of the plant was measured in 0～100 cm soil depth (20 cm as an interval) before planting and at 6 collars, 12 collars, tasseling, filling and maturity stages. The results showed that spatial-temporal distribution of soil nitrate nitrogen in south and north of the plant was influenced more by varying methods of nitrogen supply and irrigation compared with that under the plant, so did that in 0～40 cm soil depth compared with that in 40～100 cm. At filling stage, soil nitrate nitrogen of irrigated side was moved down to 60～100 cm soil depth for FI coupled with FN when nitrogen and water were applied within the same furrow, and that of non-water supply side was gathered in 0～40 cm soil depth for FI coupled with FN when nitrogen and water were applied to different furrows. Compared with CI, AI reduced soil nitrate nitrogen under the plant in 40～80 cm soil depth by 9.9%～14.4% for different nitrogen supply methods. Compared with the other treatments, AI coupled with CN or AN maintained soil nitrate nitrogen in 0～40 cm soil depth for a longer time during maize growth. Soil residual nitrate nitrogen in 0～100 cm soil depth at harvest was comparable between AI coupled with CN and AI coupled with AN, and the residual of them was reduced by 11.7%～27.3% compared with those of the other treatments. Therefore, alternate furrow irrigation coupled with conventional or alternate nitrogen supply brought a relatively reasonable spatial-temporal distribution of soil nitrate nitrogen during maize growth, and lowered soil residual nitrate nitrogen at harvest.

maize; irrigation method; nitrogen supply method; soil nitrate nitrogen; spatial-temporal distribution

10.6041/j.issn.1000-1298.2017.02.037

2016-06-25

2016-09-19

國家自然科學基金項目(51079124)、國家高技術研究發展計劃(863 計劃)項目(2011AA100504)和中央高?；究蒲袠I務費專項(QN2011067)

漆棟良(1987—)，男，博士生，主要從事節水灌溉理論與作物高效利用水氮研究，E-mail: qdl198799@126.com

胡田田(1966—)，女，教授，博士生導師，主要從事農業水土資源高效利用研究，E-mail: hutiant@nwsuaf.edu.cn

S158.5

A

1000-1298(2017)02-0279-09